developer extension agreement & general provisions and … · developer extension agreement...

3626 156th Street SW

Lynnwood, WA 98087-5021

Adopted 4-24-17

Developer Extension Agreement & General Provisions and Development Standards & Specifications, Version "G"

6-18-18

Alderwood Water & Wastewater District Standards & Guidelines

Snohomish County, Washington

3626 - 156th Street SW Lynnwood, WA 98087-5021 425-743-4605 Fax 425-742-4562 AWWD.com

Commissioners

Dean R. Lotz, President Larry D. Jones, Vice President Paul D. McIntyre, Secretary Donna J. Cross, Commissioner Jack Broyles Jr., Commissioner

General Manager Jeff Clarke Engineering & Development Director John McClellan, P.E.

Alderwood Water & Wastewater District Adopted 4/24/2017

Standards & Guidelines Developer Extension Agreement Page 1 of 18

Developer Extension

Agreement



Developer Extension Agreement

Table of Contents

Developer Extension ..................................................................................................................................... 1

Agreement ..................................................................................................................................................... 1

Developer Extension Agreement ............................................................................................................... 2

Table of Contents ........................................................................................................................................ 2

Developer Extension Application .................................................................................................................. 4

Checklist .................................................................................................................................................... 4

Application for Developer Extension Agreement .......................................................................................... 5

A. Information regarding the application for Developer Extension Agreement policies ....................... 5

B. Items Required with Application ...................................................................................................... 5

C. Signature of Property Owner(s) ....................................................................................................... 6

D. Project Information .......................................................................................................................... 6

E. District Participation ......................................................................................................................... 7

ALDERWOOD WATER & WASTEWATER DISTRICT DEVELOPER EXTENSION AGREEMENT ................................... 9

1. Nature and Location of Extension and Type of Development .......................................................... 9

2. Warranty of Authority ........................................................................................................................ 9

3. Description of Extension ................................................................................................................... 9

4. Fees and Expenses to be Paid by the Developer ............................................................................. 9

5. Reimbursement Fees ...................................................................................................................... 10

6. Design Engineer .............................................................................................................................. 10

7. Preparation of Drawings by Developer's Engineer ......................................................................... 10

8. Easements ...................................................................................................................................... 11

9. Insurance......................................................................................................................................... 11

10. Indemnity ....................................................................................................................................... 12

11. Warranties of Developer - Water and Sewer ................................................................................ 13

12. Correction of Defects Occurring Within Warranty Period ............................................................. 13

13. Cash Performance Guarantee ...................................................................................................... 13

14. Maintenance Bond ........................................................................................................................ 14

15. Early Use of the Extension ............................................................................................................ 14

16. Liens .............................................................................................................................................. 15



17. Limitation of Period of Acceptance ............................................................................................... 15

18. Final Acceptance - Conditions Precedent ..................................................................................... 15

19. Procedure for Acceptance............................................................................................................. 15

20. Date of Final Acceptance .............................................................................................................. 15

21. Effect of Acceptance ..................................................................................................................... 15

22. Rates and Charges ....................................................................................................................... 16

23. Subcontracting .............................................................................................................................. 16

24. No Assignment Without District Approval ..................................................................................... 16

25. Laws to be Observed .................................................................................................................... 16

26. District Policies and Fines ............................................................................................................. 16

27. No Third Person Shall Have any Rights Hereunder ..................................................................... 16

28. Governing Law/Forum ................................................................................................................... 16

29. Remedies Available to District ...................................................................................................... 16

30. Costs of Litigation .......................................................................................................................... 16

31. Notice ............................................................................................................................................ 16

32. General Provisions, Specifications and Standard Details ............................................................. 17

33. Complete Agreement .................................................................................................................... 17

34. Instructions .................................................................................................................................... 17

REIMBURSEMENT AGREEMENT ............................................................................................................. 19



Application No: ___________

DEVELOPER EXTENSION APPLICATION

CHECKLIST

Project Name: _______________________________________________________________

NOTE: All items on checklist shall be completed prior to scheduling a preliminary application submittal meeting. Initials/Date

(District use only)

1. Is application complete? Fee paid? ___________

2. Is verification of ownership attached? (title report or official letter from a title company) ___________

3. Is application signed by current Individual(s),Corporate Officer(s) or Partnership(s)? (Provide verification that person(s) signing application can legally sign application) ___________

4. Are the following requested items attached:

a. Project site plan using engineering scale of 1 "=20’, 30’, or 40’ including roads, environmentally sensitive areas, minimum 5 foot contour interval (NAVD 88 Datum), existing utilities (water and sewer) and other pertinent information. ___________

b. Preliminary water and sewer layout together on the same plan and profile sheet ___________

c. For all commercial and multi-family projects, Fire Marshal comments for required fire flow, approved fire hydrant locations, and type of fire protection system. ___________

d. For all commercial and multi-family projects, a completed Water Use Survey or Sewer Use Survey. ___________

e. Requirements from other agencies relative to water and sewer utilities/services.

f. Depiction of Low Impact Development (LID) measures on project site plan __________ (if applicable).

g. Any other information the applicant or District determines pertinent for adequate preliminary review of this project. ___________

5. Check appropriate box for potential reimbursement (latecomers) agreement for water and sewer facilities. ___________

Application No. ________ Date Assigned ________



Alderwood Water & Wastewater District

APPLICATION FOR

DEVELOPER EXTENSION AGREEMENT Application For:

Extension of Water

Extension of Sewer

Sewer Lift Station A non-refundable application administration fee as set by the District fee schedule is required at the time of application for a Developer Extension Agreement. The undersigned applies to the Commissioners of Alderwood Water & Wastewater District, "District" for a preliminary project review of connection charges and other conditions that the District shall establish as conditions of connection to the District’s water or sewer system.

A. INFORMATION REGARDING THE APPLICATION FOR DEVELOPER EXTENSION AGREEMENT

POLICIES Read Carefully.

1. Submission of this application facilitates administration of the District’s Developer Extension process. However, the application is not a Developer Extension Agreement or an agreement to enter into a Developer Extension Agreement. The application enables the District to identify connection charges and other fees and charges for the project and to identify conditions for connection to the District's system. If this application is accepted, the District may enter into a Developer Extension Agreement incorporating all such terms and conditions.

2. Whenever a Reimbursement (Latecomer) Agreement is requested, the project is subject to the District’s Policy related to reimbursement agreements. A deposit with the District is required to be used for its expenses associated with engineering review, legal services, administration, setup, mailing, public notification, recording of the Reimbursement Agreement, and other items needed to administer the agreement. District expenses shall be deducted from the deposit on a time and materials basis.

B. ITEMS REQUIRED WITH APPLICATION The following items shall be attached to and submitted with the Preliminary Application:

1. Project site plan using engineering scale of 1 "=20’, 30’, or 40’ including roads, environmentally sensitive areas, minimum 5 foot contour interval (NAVD 88 Datum), existing utilities (water and sewer) and other pertinent information.

2. Permits and determinations from other agencies relative to water and sewer services.

3. Type of fire protection required.

4. Preliminary water and sewer layout together on same plan and profile sheet.



5. Any other information the applicant or District determines pertinent for preliminary review of this project including the intent and location of any proposed Low Impact Development (LID) measures as well as any preliminary information on the project, such as a Determination of Non-Significance, SEPA Application, or City/County Application and project number, if applicable.

Verification of legal ownership, either by current title insurance report (less than 120 days old) or official letter from a title company identifying date of review, legal description, address of property, other appropriate information, and current legal vested ownership shall be provided.

The undersigned warrants that all information supplied to the District is complete and accurate. The District reserves the right to modify the estimated connection charges and other conditions as additional or new information becomes apparent or available.

C. SIGNATURE OF PROPERTY OWNER(S)

(If owner is a corporation, LLC,

partnership, etc., signature

authorization must be furnished for individual

signing on behalf of owner)

Print Name and Title

Signature

Date

D. PROJECT INFORMATION

Name of Project:

Address of Project:

Type of Development:

(i.e., residential, multi-family, commercial, etc)

Number of lots/units:

Commercial buildings:

Property Owner Information

Property Owner: __________________________________________________

(Print or type full name)

Address __________________________________________________

__________________________________________________

Telephone No.: __________________________________________________

E-mail __________________________________________________

Developer Information: __________________________________________________



(if available) (Print or type full name)

Address: __________________________________________________

__________________________________________________

Telephone No.: __________________________________________________

Fax No.: ______________________________

Cell Phone: ______________________________

e-mail: __________________________________________________

Agent Name: __________________________________________________

(Print or type full name)

Company Name: __________________________________________________

(if different)

Address: __________________________________________________

__________________________________________________

Telephone No.: ________________________________

Fax No.: ________________________________

Cell Phone: ________________________________

e-mail: __________________________________________________

E. DISTRICT PARTICIPATION

The District will consider participating in a water or sewer facility Extension such as oversizing of a main or other conditions that the District considers in excess of that normally required. District participation is limited to credits toward connection charges unless otherwise approved by the Board of Commissioners. District staff will help in determining if District participation is applicable.



FOR DISTRICT USE ONLY

All connection fees and charges will be assessed at the time an application for service connection is made and shall be based upon the approved District fee schedule at that time. The District may review and act upon an application without referral to the Board of Commissioners. Approved by the District: _____________________________________ ____________________ By Date Not Approved by the District: __________________________________ ____________________ By Date

Approval Subject To Conditions:

Developer Extension Agreement Required

Offsite sewer Extension Offsite water Extension Onsite sewer Extension Onsite water Extension Offsite easement to District Offsite easement to District Other Conditions:

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________



ALDERWOOD WATER & WASTEWATER DISTRICT

DEVELOPER EXTENSION AGREEMENT

_____ WATER _____ SEWER

Application No. __________ The Alderwood Water & Wastewater District ("District") and ("Developer") for the purpose of constructing an Extension(s) to the District's system and in consideration of the mutual promises and covenants herein contained agree:

1. NATURE AND LOCATION OF EXTENSION AND TYPE OF DEVELOPMENT a. Benefited Property. The proposed system Extension(s) shall be installed in streets, approved

rights-of-way and easements at the Developer’s sole cost for the use and benefit of the property legally described as:

b. Type of Development. (i.e., single family, multi-family, commercial, etc.) include plat name or

short plat number and number of lots/units.

2. WARRANTY OF AUTHORITY The Developer and any additional owners as defined in the General Provisions warrant they are the owners/developers of the property described in this Agreement, and agree to be bound by its terms. Developer shall upon request provide a title report to the District establishing that the parties executing this Agreement are the owners of all the real property described herein.

3. DESCRIPTION OF EXTENSION a. Water. The proposed Extension will consist of approximately _______________ lineal feet of

water pipe and appurtenances, and shall be installed in accordance with this Agreement and with District approved Drawings and Specifications.

b. Sewer. The proposed Extension will consist of approximately _______________ lineal feet of

sewer pipe and appurtenances, and shall be installed in accordance with this Agreement and with District approved Drawings and Specifications.

c. Sewer Lift Station. The proposed Extension Does_____ / Does Not_____ require the construction of a sanitary sewer lift station, and appurtenances and shall be installed in accordance with this agreement and with District approved Drawings and Specifications.

4. FEES AND EXPENSES TO BE PAID BY THE DEVELOPER A non-refundable administration fee along with a design review deposit fee shall be paid when this Agreement is submitted to the District for payment of District's estimated expenses including, but not limited to, design engineering, design review, legal and permit costs. Construction engineering and inspection deposit fees and cash performance guarantee shall be paid to the District prior to scheduling a pre-construction meeting. Specific fees are imposed by Resolution and shall be paid in addition to the non-refundable administration fee. Should actual expenses exceed the deposit, the difference shall be paid by Developer to the District. If the District determines, after the project is completed and accepted, that expenses were less than the



deposit, then the balance of the fee shall be refunded to Developer. All District services shall be billed on a time and material basis as provided by the approved District fee schedule at that time. The foregoing estimate of expenses does not include allowance for any unusual costs incurred by the District for property surveys, hydraulic modeling, changes in design, excessive construction inspections, project coordination, errors or omissions by the Developer, its contractor or agents, unusual negotiations, legal expenses or any other project related costs. Additional design or plan review due to design modifications or changes in the original project design or layout shall be considered unusual costs. The District shall bill the Developer for any unusual costs which shall be paid promptly by the Developer. The District may discontinue plan review or not sell water meters for the developer Extension until payment is received for any unusual costs incurred.

5. REIMBURSEMENT FEES The Developer shall pay all reimbursement fees, if any, levied against the property pursuant to the District's reimbursement Policy no later than ten (10) days prior to use and operations.

6. DESIGN ENGINEER Design engineering shall be performed by the Developer's Engineer. Upon request by the Developer and approval by the District, the District may provide the design engineering. Nothing contained in this Agreement creates any contractual rights between the District and the Developer’s Engineer.

7. PREPARATION OF DRAWINGS BY DEVELOPER'S ENGINEER The Developer's Engineer shall be experienced in the design of water, sewer and lift stations as appropriate. The Developer shall notify the District in writing of the person or firm proposed to design the Drawings when the Developer submits this Agreement to the District. Before commencing preparation of the Drawings, the District, the Developer and the Developer's Engineer shall hold a pre-design meeting. The Developer shall arrange for the conference and the attendance of concerned parties. At the pre-design meeting, the District will review project requirements, specific design considerations, drafting and submittal requirements and other relevant items. After the pre-design meeting, Developer's Engineer shall submit to the District a project design and plan/profiles for review. All design and drawings shall meet the requirements as listed in the District Standards. Failure of the District to discover errors, omissions or discrepancies in the Drawings shall not relieve the Developer of this responsibility. The District will review the design and comment thereon. The Developer's Engineer shall incorporate the District's comments into the final project design and provide the District with a final check print for verification. Any additional reviews required shall be considered an unusual cost and subject to charges in accordance with Section 4 above. The District's approval of the Drawings for Developer’s Extensions shall be noted on the original drawings. Approval shall be by signature of the Planning & Development Services Manager or Designee in an "Approved by Planning & Development Services Manager" signature block. Original approved drawings shall become the property of the District. The Developer's Engineer shall submit copies of the approved Drawings to the appropriate approving agencies for necessary permits, approvals, and certifications, except that the District shall obtain right of way permits issued by Snohomish County Public Works. The Developer's Engineer shall notify the District of any permits required. Should changes to the Drawings be required to obtain permits, approvals, and certifications, the Developer's Engineer shall make all required changes and provide copies of the changed documents to the District.



The Developer shall be responsible for providing all required agency certifications at the completion of the project. The District reserves the right to require changes in the Drawings during the course of work to conform to the District's Standards. The District reserves the right to determine if Low Impact Development (LID) features, and other jurisdictional requirements, are feasible or acceptable if placed near or above the District’s facilities.

8. EASEMENTS All easements shall be obtained by the Developer and submitted on District standard forms without cost to the District. All easements shall be reviewed and approved by the District prior to obtaining signatures and approvals. The Developer shall provide the District with supporting data to verify the location of all easements. All easements shall be a minimum of fifteen feet in width, unless otherwise approved by the District. An exhibit map shall be included with the easement of the written easement description. Developer shall upon request provide the District satisfactory title insurance insuring without exception the District's interest in all easements conveyed to the District. The District shall apply for and secure easements required from property owned by the P.U.D. No. 1 of Snohomish County. Executed copies of off-site easements shall be delivered to the District prior to the preconstruction conference. Other easements shall be delivered to the District prior to the acceptance of the Extension(s). Permanent easements shall be conveyed to the District free of any permanent structures or other structures which interfere with District maintenance and repair responsibilities. Developer agrees not to construct or install such structures on the easement after District has accepted the Extension.

9. INSURANCE The Contractor shall purchase and maintain at all times, including the warranty period, an insurance policy from an insurance company which has an A.M. Best rating of "A VII" or better commercial general liability and automobile liability insurance against liability to the Contractor, the District, the Developer's engineer and the District employees for negligent injury to person or property resulting from performance, supervision, or inspection of the Work. The District shall be named as an additional insured under such policy. Proof of the existence of such insurance shall be provided to the District in a form acceptable to the District and shall include the project name and number.

The minimum limits of coverage shall be as follows unless approved in writing by the District:

General Aggregate $2,000,000

Products - Comp/OPS Aggregate $2,000,000

Personal Injury $2,000,000

Each Occurrence $2,000,000

Automobile Liability $1,000,000

Note:

All current policies shall be provided before work can occur.

The General Aggregate requirement may be fulfilled with an umbrella policy with equivalent limits.

Ongoing operations coverage must be equivalent to ISO form 20 10 07 04 and products and completed operations coverage must be similar to ISO form CG 2037 07 04.

Policies shall be kept in force until the project is accepted by the District and warranty period has been completed. The District shall be given at least 30 days written notice of cancellation, non-renewal, material reduction or modification of coverage.



The coverage provided by the insurance policies is to be primary to any insurance maintained by the District, except with respect to losses attributable to the sole negligence of the District. Any insurance that might cover this Agreement which is maintained by the District shall be in excess of the Developer's/Contractor's insurance and shall not contribute with it. The insurance policy shall protect each insured in the same manner as though a separate policy had been issued to each. The inclusion of more than one insured shall not affect the rights of any insured with respect to any claim, suit or judgment made or brought by or for any other insured or by or for any employee of any other insured. The general aggregate provisions of the insurance policy shall be amended to show that the general aggregate limit of the policies apply separately to this project. The insurance policy shall not contain a deductible or self-insured retention in excess of $10,000 unless approved by the District. Providing coverage in the stated amounts shall not be construed to relieve the Contractor from liability in excess of such limits.

10. INDEMNITY The Contractor shall indemnify, defend and hold the District and all of its representatives harmless from and against all losses and claims, demands, payments, suits, actions, recoveries and judgments of every nature and description brought or recovered against the District by reason of the act or omission of the Contractor, its agents or employees, in the performance of the Work, and for any cost or expense incurred by the District in connection therewith, including overhead expense, legal expense, reasonable attorney's fees and costs attributable thereto; and if suit in respect to the foregoing is filed, then Contractor shall appear and defend the same at its own cost and expense, and, if judgment is rendered or settlement made requiring payment of damages by the District, then the Contractor shall pay the same. Contractor shall indemnify, defend and hold the District harmless from any liability or expense, including reasonable attorney's fees incurred by the District by reason of Contractor (or Contractor's employees or subcontractors) breach of franchise, permit, or right-of way approval granted by the state, city, or public or private utility to the District for the purpose of enabling Contractor to undertake construction within any Right-of-Way. In the event a District franchise permit has expired, the conditions of the expired permit of the local or state codes, whichever is more stringent shall apply. Contractor further agrees that if any agency complains to the District that the Contractor is violating such franchise or permits in any respect, or if the Contractor damages any District's facilities, then the District shall give the Contractor reasonable notice to comply with such franchise or permit or to make repairs or restoration. If the District deems it necessary to make any repairs or restoration (emergency or otherwise) then the Contractor shall reimburse the District for the cost thereof. In any claim against the District, its agents or employees by any employees of the Contractor, or any subcontractor, or anyone directly or indirectly employed by any of them, or anyone for whose acts any of them may be liable, the indemnification obligation contained herein shall not be limited in any way by any limitation on the amount or type of damages, compensation or benefits payable by or for the Contractor, or any subcontractor under Workmen's Compensation Acts, Disability Benefit Acts, or other employee benefit acts. This waiver has been mutually negotiated by the parties.



11. WARRANTIES OF DEVELOPER - WATER AND SEWER The Bill of Sale shall be provided by the Developer and transfers ownership of the Extension from the Developer to the District. The Bill of Sale form can be found on the District website and shall contain the following warranties with the District as beneficiary:

a) That the Developer owns the Extension free and clear of all encumbrances and Developer has full authority to transfer title thereto to the District and will defend the title of the District against the claims of all third parties claiming to own the same or claiming any interest therein or encumbrance thereon; and

b) That all bills and taxes relating to the construction and installation of the (water or sewer) Extension

and appurtenances have been paid in full and there are no lawsuits pending involving this project. If any lawsuit is filed as a result of, or involving, this project and its warranties, then the Developer shall undertake to defend the lawsuit and shall accept responsibility for all costs of litigation, including costs on appeal, and shall hold the District harmless on any judgment rendered against the District.

c) That Contractor complied with all laws and ordinances respecting construction of this project, and

the Extension is in proper working condition, order and repair, and is adequate and fit for the intended purpose of use as a (water)(sewer) system and as an integral part of the (water supply and distribution)(sewer collection) system of the District, and the Extension has been constructed in accordance with the conditions and standards of the District; and

d) That for a minimum period of two (2) years after the date of final acceptance of the Extension by the

District and when top lift paving is completed, whichever is later, and re-inspection of the project is completed, the Extension and all parts thereof shall remain in proper working condition, order and repair; and Contractor shall repair or replace, at its expense, any work or material which, proves defective during the period of the warranty.

In addition, Contractor shall obtain and assign to the District warranties and guaranties from its subcontractor or suppliers where such warranties or guaranties are specifically required in this Agreement. When corrections of defects occurring within the warranty period are made, Contractor may be required to warranty the corrected work for one (1) year after acceptance of the corrected work by the District at the sole discretion of the District.

12. CORRECTION OF DEFECTS OCCURRING WITHIN WARRANTY PERIOD When defects in the Extension(s) are discovered within the warranty period, Contractor shall start work to remedy any such defects within seven (7) calendar days from the date sent of written notice provided via email (and followed up via mail) by the District and shall complete such work within a reasonable time. In emergencies, where damages may result from delay or where loss of service may result, corrections may be made by the District, and the cost thereof shall be paid by the Contractor. If the Contractor does not commence or accomplish corrections within the time specified, then the work may be accomplished by the District, and the cost thereof shall be paid by the Contractor. Contractor shall reimburse the District for damages or expenses incurred by the District resulting from defects in the Contractor's work, including cost of materials and labor, the cost of engineering, and the cost of inspection and supervision by the District.

13. CASH PERFORMANCE GUARANTEE The Developer shall furnish to the District a $2,500 Cash Performance Guarantee for each separate water and sewer extension. The Guarantee(s) shall be deposited with the District or an assignment of funds in a form (see District website) prior to release of the approved Drawings by the District. The Guarantee(s) shall be used as a performance guarantee for proper completion of the Extension(s) and repair of any defective material and workmanship. The Guarantee(s) shall be held by the District until the



warranty inspection is approved. The Contractor shall be responsible for any defective material or workmanship, including road settlement or pavement damage. If the Developer terminates the project prior to construction of the Extension(s), and the District incurs expenses greater than the amount collected from the Developer, then such additional expenses shall be deducted from the Guarantee(s) before being refunded or released to the Developer.

14. MAINTENANCE BOND Final acceptance of the Extension(s) by the District shall not relieve the Contractor of the obligation to correct defects in labor or materials. Before final acceptance the Contractor shall furnish to the District a maintenance bond (bond, assignment of fund or cash) which shall be in force for the warranty period listed in Item 11(d). The bond shall be on the District standard form (see District website). The maintenance bond shall be in an amount equal to following:

Aggregate Total Construction Cost* of Water and Sewer Installed by Developer Extension Agreement

Required Dollar Value of Maintenance Bond

- 0 - to $5,000.00 - 0 -

$ 5,000.01 to $10,000.00 $3,000.00

$10,000.01 to $25,000.00 $5,000.00

$25,000.01 to $100,000.00 $10,000.00

greater than $100,000.00 10% of total construction cost

*Total Construction Cost shall include Washington State Sales Tax. A precondition of the District's release of the maintenance bond shall be payment by the Contractor of all outstanding expenses incurred by the District. At the end of warranty period listed in Item 11(d) this section, the District will inspect the Extension(s) and release this Bond in writing if the Extension(s) is in satisfactory condition; otherwise the maintenance bond remains in effect until released in writing by the District. In lieu of providing a maintenance bond to the District, municipal corporations shall agree to promptly correct any defects in labor and/or materials associated with the installation of the new water and/or sewer system for a period of two years after acceptance. The District shall be responsible for re-inspection of the project prior to the two-year date. If no defects are detected in the re-inspection, no further work will be required of the municipal corporation. The District maintains sole discretion in the identification of defects in labor and/or materials during the two-year period.

15. EARLY USE OF THE EXTENSION

A. BEFORE TOP LIFT PAVING (COMPLETION GUARANTEE)

If the Developer completes the Extension(s) and desires service prior to the final paving of streets within the development, then at the District's option and as a condition of service, a cash deposit or an assignment of funds in a form (see District website) and amount acceptable to the District shall be deposited with the District to cover 125% of the cost of work yet to be completed. After the Developer notifies the District that top lift paving has been completed, the Completion Guarantee will be released after the District's satisfactory inspection.



B. MODEL HOME CONNECTION

If the Developer completes the Extension's water and sewer system installation and desires to connect model homes, early use of the water and sewer system may be granted, at the District's option. The Developer must enter into an early system access agreement.

16. LIENS Prior to final acceptance of the Extension(s), the Developer shall deliver to the District a Bill of Sale(s) indicating that there are no liens against the Work. If any lien arises or remains unsatisfied after acceptance of the Work, then the Contractor shall reimburse the District for any costs incurred on account thereof, including reasonable attorneys' fees.

17. LIMITATION OF PERIOD OF ACCEPTANCE The Developer’s Extension(s) shall be completed so that it can be accepted in its entirety within two (2) years of the date of this Agreement, otherwise this Agreement and all the Developer’s rights herein shall terminate unless this Agreement is extended in accordance with District policy. If the Agreement terminates, the Developer shall submit a new application for developer Extension agreement to the District. Any new agreement shall be subject to any new or amended code, policies, or standards and specifications adopted after the execution of the terminated. If a project does not begin construction within one (1) year of the approval of the Drawings or is inactive for 6 months after start of construction, the Drawings are subject to a review prior to scheduling a pre-construction meeting or restarting the project. The project is also subject to new or amended code, policies, standards and specifications adopted after the original design was approved. Additional fees for review of Drawings shall apply.

18. FINAL ACCEPTANCE - CONDITIONS PRECEDENT Compliance with all terms and conditions of this Agreement, the Drawings and Specifications and other District requirements is a condition precedent to the District's obligation to allow connection to the District's system, to accept the bill of sale to the Extension(s) to maintain and operate the Extension(s) and to provide service to the real property described in this Agreement. The District shall not be obligated to accept title to the Extension(s) or to provide service to the property described in this Agreement if construction by third parties of facilities to be deeded to the District has not been completed and those facilities are necessary to provide service to the property described in this Agreement. The District shall not be obligated to allow service connections to its system until all fees or connection charges in effect on the date of application for service have been paid.

19. PROCEDURE FOR ACCEPTANCE Acceptance of title to the Extension(s) shall be by written notification by the District. Prior to acceptance, the bill of sale, the warranties, all necessary easements, and the record documents required by this Agreement shall be delivered to the District.

20. DATE OF FINAL ACCEPTANCE The date of final acceptance shall be the date of the written notification of acceptance.

21. EFFECT OF ACCEPTANCE The warranty period commences with the acceptance of the Extension(s) by the District. Acceptance also transfers ownership of the Extension(s) to the District for operation as a public system subject to District rules and regulations, conditions of service, and service charges.



22. RATES AND CHARGES The property described in this Agreement shall be subject to all rates and charges established by the District in place at the time of final acceptance.

23. SUBCONTRACTING Contractor is fully responsible for the acts and omissions of subcontractors and persons employed, directly or indirectly, by subcontractors, as well as the acts and omissions of Contractor's employees.

24. NO ASSIGNMENT WITHOUT DISTRICT APPROVAL This Agreement and Developer's rights and responsibilities may not be assigned without the prior written consent of the District. Any District approved assignment shall be in writing in a form approved by the District and filed with the District by the Developer.

25. LAWS TO BE OBSERVED The Contractor shall comply with all federal, state, and local laws, ordinances and regulations that affect the Work that is the subject of this Agreement. The Contractor shall pay all expenses incurred for complying with such laws, ordinances and regulations.

26. DISTRICT POLICIES AND FINES District Policies may impose fines for violating their terms and conditions. Contractor agrees to comply with all District Policies and to ensure compliance with District Policies by the Contractor's agents. Contractor agrees to pay any fine imposed pursuant to District the approved District fee schedule.

27. NO THIRD PERSON SHALL HAVE ANY RIGHTS HEREUNDER This agreement is made only for the benefit of the District and the Developer. No third person or party shall have any rights hereunder whether by agency or as a third-party beneficiary or otherwise.

28. GOVERNING LAW/FORUM This agreement shall be construed and enforced in accordance with the law of the State of Washington. Any suit to enforce the provisions of the agreement shall be brought in the Superior Court of Snohomish County, Washington.

29. REMEDIES AVAILABLE TO DISTRICT If the Contractor fails to pay any fees, charges or fines when due as determined by the District, then the charge or fine shall be delinquent and shall accrue interest at lesser of 12% or the highest legal rate per annum until paid as permitted by law. In addition to other remedies, the District may file a lien against the Real Property referenced herein and commence foreclosure proceedings as permitted by law.

30. COSTS OF LITIGATION If either the District or the Contractor commences any legal action relating to the provisions of this agreement, then the prevailing party shall be entitled, to recover all costs of litigation, including out of pocket expenses, expert fees, and reasonable attorneys' fees, including all such costs and fees incurred on appeal. In any litigation arising out of this Agreement or related to this project to which the District is not a party the Contractor shall reimburse the District for all of its costs and expenses, including attorney's or engineer 's fees, that are reasonably and necessarily incurred as a result of such litigation.

31. NOTICE Unless otherwise notified, any notice or other correspondence required by this Agreement shall be in writing to the address identified in the Application for Developer's Extension Agreement.



32. GENERAL PROVISIONS, SPECIFICATIONS AND STANDARD DETAILS Refer to the General Provisions and the District’s Specifications and Standards, which are incorporated by reference herein and made a part of this Agreement.

33. COMPLETE AGREEMENT This Agreement constitutes the entire agreement between Developer and District, which may only be changed in writing. For purposes of identification, this Agreement shall be assigned a number by the District, which number shall be endorsed on the first page of the Agreement.

34. INSTRUCTIONS a. If the Developer is a corporation, this Agreement shall be executed by its duly authorized

representative and the Developer hereby warrants same.

b. If the Developer is a partnership, at least one of the general partners shall sign this Agreement and indicate his/her capacity as such.

c. If the Developer is a joint venture, this Agreement shall be executed by the authorized

representative, pursuant to a power of attorney, who shall sign on behalf of the others.

Dated this ______ day of _______________, 20___. DEVELOPER: (print / type name) A corporation, partnership, joint venture, sole proprietorship. By: (Signature) (print / type name) Its: (title or position) Signature authorization shall be provided for individuals signing for corporations, partnerships, joint ventures, etc.



STATE OF WASHINGTON ss. COUNTY OF SNOHOMISH I certify that I know or have satisfactory evidence that _________________________________ signed this instrument, on oath stated that he/she is authorized to execute the instrument and acknowledged it as the ________________________________________of _______________________________________ be the free and voluntary act of such parties for the uses and purposes mentioned in said instrument.

Dated:

Name: Printed Name: Notary Public in and for the State of Washington Commission expires:

ALDERWOOD WATER & WASTEWATER DISTRICT By: Its: General Manager Date



(REQUEST FOR) OR (WAIVER OF)

REIMBURSEMENT AGREEMENT FOR WATER OR SEWER FACILITIES

DISTRICT DEVELOPER EXTENSION AGREEMENT The undersigned ("Developer") hereby: (check only one box)

❑ Acknowledges that the water or sewer facilities constructed pursuant to this Developer Extension Agreement

(”DEA”) executed by the Developer and the District is not eligible for reimbursement pursuant to Chapter 57.22 RCW or as amended.

❑ Irrevocably waives the right to apply for or receive reimbursement pursuant to Chapter 57.22 RCW or as

amended for the water or sewer facilities constructed pursuant to this Developer Extension Agreement (“DEA”) executed by the Developer and the District.

❑ Reserves the right to apply to District for a Reimbursement Agreement pursuant to this Developer Extension

Agreement ("DEA") executed by Developer and the District. The Developer requesting a reimbursement agreement shall submit a deposit, as imposed by the approved District fee schedule, to the District to be used for its expenses associated with engineering review, legal services, administration, setup, mailing, public notification, recording of the Agreement, and other items needed to administer the agreement. Such District expenses shall be deducted from the deposit on a time and materials basis. The time and materials charges shall be based on District salary costs (direct labor plus the District's current overhead rate at the time that the Reimbursement Agreement is approved) and on the District's current rate schedule or actual costs for materials. If the District's expenses exceed this deposit, the Developer shall reimburse the District for its additional expenses before the Agreement is recorded and within 30 days of notification by the District that such ad ditional fees are due. The District shall reimburse to the Developer any of the remaining deposit upon return of the recorded Reimbursement Agreement to the District from the Snohomish County Auditor’s Office. DEVELOPER/ APPLICANT: (Signature) (Printed Name) Title:

Company Name:

Date:

Alderwood Water & Wastewater District Adopted 4-24-17 Standards & Guidelines Development Guidelines Page 1 of 7

Development Guidelines


Table of Contents

DEVELOPER EXTENSION GUIDELINES ................................................................................. 3

A. INTRODUCTION ........................................................................................................... 3

B. DEVELOPER EXTENSION PROCESS .......................................................................... 3

1. General ........................................................................................................................... 3

2. Water or Sewer Availability ............................................................................................. 3

3. Application for Developer Extension Agreement ............................................................. 4

4. Developer Extension Agreement ..................................................................................... 4

5. Project Review ................................................................................................................ 4

6. Construction .................................................................................................................... 5

7. Inspection ....................................................................................................................... 5

8. Final Acceptance or Use and Operation .......................................................................... 6


DEVELOPER EXTENSION GUIDELINES

A. INTRODUCTION

The Alderwood Water & Wastewater District provides public water and sewer service to approximately 44 square miles in southwest Snohomish County. The District is governed by a five member Board of Commissioners. The District is managed by a General Manager who is supported by an Engineering & Development Director, Director of Finance, Maintenance and Operations Director, Administrative Services Manager, and support staff. The District was created in 1931 pursuant to RCW Title 57 to furnish public water service within a specific geographical boundary. In June of 1966, the District adopted a comprehensive sewer plan and began providing sanitary sewer service. Several cities or portions thereof are located within the District's corporate boundaries.

B. DEVELOPER EXTENSION PROCESS

1. General

Connecting to the District's water and sewer facilities can be simple, such as when water or sewer is already available to the property. The connection process can also be more complex, such as when an extension of the District's water and/or sewer facilities is required before connection can occur. The following sections describe the various steps required when a property owner, individual, business, corporation or other entity desires to connect to the District's water or sewer system, and when such connection requires the extension of public water or sewer facilities. A summary of this process, and all referenced forms, is available on the District's website.

2. Water or Sewer Availability

The first step required for connection to the District's water or sewer system is submittal of a Water or Sewer Availability request. A project cannot move forward if water or sewer is not available to a property at conditions the District considers favorable. The purpose of the Water or Sewer Availability is to determine early in the process if water or sewer is currently available or whether connection to these systems will require an extension of water and or sewer facilities. A secondary purpose of the Water or Sewer Availability step is to provide information pertaining to what the estimated connection charges would be if required as a condition for service connection. The request for Water or Sewer Availability must be made using the District's standard form.


Actual connection charges may vary from the estimate provided as estimates are based upon charges in effect at the time the Water or Sewer Availability request is received.

3. Application for Developer Extension Agreement After receiving a Water or Sewer Availability Certificate from the District indicating that a Developer Extension Agreement is required, and the proponent of the project determines they wish to proceed, an application for a Developer Extension Agreement must be completed. The Application for Developer's Extension Agreement (DE Application) provides the District with additional project specific information. The DE Application must be submitted to the District along with payment of an administration fee. An appointment to submit the DE Application is required. At the DE Application submittal appointment, the developer, or their agent, shall present an overview of the project. Issues, agency requirements, and other relevant information pertaining to the project's design should be provided for District consideration. Upon review of a completed DE Application, the District will respond in writing either approving or denying the Application or approving the Application subject to specific conditions. The District will respond with a Water and/or Sewer Condition Letter summarizing the District's requirements and conditions for water or sewer service along with applicable charges required for connection. Typical conditions would include the provision for looping the water system for fire flow and extending sewer service to adjacent parcels.

4. Developer Extension Agreement After the Developer submits a DE Application and receives a condition letter, and if they desire to proceed with the project, the Developer will enter into a formal Developer's Extension Agreement (DEA) with the District. The DEA will be the formal Agreement with the specific terms and conditions applicable to the proposed project. The DEA requires deposits and payment of plan review fees based on the fee schedule in effect at the time of submittal to the District.

5. Project Review Designs for Developer Extensions are typically completed by the Developer's Engineer and submitted to the District for review and approval. When the Developer wishes to submit design drawings to the District for project review, an Intake Appointment must be scheduled. At the Intake Appointment, the developer will be required to provide plans that meet the prerequisites for project review, shall provide the signed and notarized Developer Extension Agreement, and shall pay all required fees and deposits. Reviews of project designs are completed in the order received. The time required to complete a design review depends on staff workload, the complexity of the project, the quality of Developer’s design, and the completeness of requested materials to the District. Project plan review or design will not begin until all required information has been received by the District.


In rare cases, the Developer may request that the District assist with portions of the design. This is for unique projects and requires the approval of the District. Should the District agree to this request, additional information relative to completing the portions to be designed by the District must be submitted by the Developer. This information may include but not be limited to:

Fire flow requirements and approved hydrant locations from Fire Marshal.

A full set of civil plans including grading, storm drainage, street plans and profiles.

Geotechnical information.

A topographic survey map of existing site conditions.

Plans showing locations, sizes, and materials of all other utilities including gas, power, telephone, cable, etc.

AutoCAD drawing files or drafted base sheets.

Other information required by the District to complete their design.

6. Construction

Construction and installation of the utility facilities shall be by the Developer's Contractor, at the Developer’s expense, and in accordance with the District’s Developers Extension Agreement, General Provisions, Development Guidelines and Standards for Developer Extensions. Prior to any construction, the Developer must request a Pre-Construction Conference. The District will schedule and hold the Pre-Construction Conference. The Developer shall arrange for the attendance of their contractor. A checklist of requirements needed to be completed prior to requesting a Pre-Construction Conference is available on the District’s website. Not all requirements apply to every Development. No work on water or sewer facilities shall occur prior to the Pre-Construction Conference unless otherwise approved by the District.

7. Inspection

The project will require periodic inspection. Coordination of construction activities with the assigned District's Inspector(s) is required. No new utility facilities will be accepted by the District if proper inspections have not been completed. At the completion of installation, the District will complete a final inspection. The final inspection will develop a punch list of all items remaining to be completed. These punch list items will consist of field corrections and administration documentation and are required to be completed in order for the new utility facilities to be accepted for use and operation. Field work does not need to be complete prior to completing most of the administrative documentation.


8. Final Acceptance or Use and Operation

After all the water or sewer facilities have been installed and the project punch list has been completed, the District will provide written acceptance of the water or sewer facilities as part of the District facilities and authorize acceptance for use and operation. The new water or sewer facilities are then available for utility service connections. There are individual connection charges and application fees for each separate connection to the District's system as established by the District fee schedule.


9. Developer Extension Process Flow Chart

Alderwood Water & Wastewater District Adopted 4-24-2017

Standards & Guidelines

Division 1 – Definitions & General Provisions Page 1 of 17

DIVISION 1

Definitions

&

General Provisions




DIVISION 1

GENERAL PROVISIONS

Table of Contents

INTRODUCTION ........................................................................................................................................ 4

GP-1 DEFINITIONS ............................................................................................................................... 4

GP-2 Purpose ..................................................................................................................................... 6

GP-3 Authority of District .................................................................................................................... 7

GP-4 District to be Informed ............................................................................................................... 7

GP-5 Plans and Specifications Accessible ............................................................................................ 7

GP-6 Final Inspection ........................................................................................................................... 7

GP-7 Record Drawings/Asbuilt Submittals ........................................................................................... 7

GP- 8 Ownership of Drawings ............................................................................................................. 9

GP-9 Quality of Materials and Workmanship ..................................................................................... 9

GP-10 Materials and Equipment List ................................................................................................... 9

GP-11 Determination of “As Equal” .................................................................................................... 9

GP-12 Omissions and Discrepancies ................................................................................................... 9

GP-13 Inspection and Tests ............................................................................................................... 10

GP-14 Compliance with Public Authority .......................................................................................... 10

GP-15 Cross Connection Control ........................................................................................................ 11

GP-16 No Stormwater Discharge ...................................................................................................... 11

GP-17 Pre-Construction Conference ................................................................................................. 11

GP-18 Permits .................................................................................................................................... 11

GP-19 Survey Control ........................................................................................................................ 12

GP-20 Restoration of Improvements ................................................................................................ 12

GP-21 Access ..................................................................................................................................... 12

GP-22 Specifications Incorporated By Reference.............................................................................. 12




GP-23 Use of Completed Portions ..................................................................................................... 13

GP-24 Existing Ut i l i t ies o r Obstructions ........................................................................................ 13

GP-25 Site Maintenance .................................................................................................................... 13

GP-26 Public Hazard or Inconvenience ............................................................................................. 14

GP-27 Protection of Work and Property ........................................................................................... 14

GP-28 Royalties and Patents ............................................................................................................. 14

GP-29 Other Work ............................................................................................................................. 14

GP-30 Contractors ............................................................................................................................. 14

GP-31 Traffic Maintenance and Protection ....................................................................................... 15

GP-32 Sanitation ................................................................................................................................ 15

GP-33 Safety ...................................................................................................................................... 15

GP-34 Confinement of Contractor's Operations ............................................................................... 15

GP-35 Alignment ............................................................................................................................... 16

GP-36 Taps, Cut-Ins and Large Meter Installation ............................................................................. 16

GP-37 Recording ................................................................................................................................ 16

GP-38 Cost of Water .......................................................................................................................... 16

GP-39 Easements Criteria .................................................................................................................. 16

GP-40 Deviation ................................................................................................................................. 17




DIVISION 1

GENERAL PROVISIONS

INTRODUCTION

These Standards within are presented to inform the Developer or Contractor of the general

minimum requirements necessary in the construction and acceptance of water and sewer

facilities within the Alderwood Water & Wastewater District. All work shall be completed according

to the Plans and Specifications, and in compliance with the laws of the State of Washington and

the standards and resolutions of the Alderwood Water & Wastewater District and other

jurisdictions within the District’s boundaries so far as applicable.

GP-1 DEFINITIONS

Words and terms shall be given their ordinary and usual meanings. Where used in the Contract

Documents, the following words and terms shall have the meanings indicated. The meanings

shall be applicable to the singular, plural, masculine, feminine and neutral of the words and terms.

A. “Alderwood Water & Wastewater District or District”: May be used interchangeably and refers to the Alderwood Water and Wastewater District, Snohomish County, Washington, a municipal corporation existing under and by virtue of the laws of the State of Washington, acting through the individual Commissioners and/or the District General Manager. The term “District” shall also include any individuals designated to perform technical and/or administrative functions. All communications with the District shall be through such individuals.

B. “ANSI/NSF”: Refers to the American National Standards Institute/National Science Foundation.

C. “APWA”: Refers to the American Public Works Association.

D. “ASTM”: Refers to ASTM International, formerly known as American Society for Testing and Materials.




E. “AWWA”: Refers to American Water Works Association.

F. “Concerned Parties”: Means those persons, companies or agencies designated by the District as

being required to attend the pre-construction conference.

G. “Construction Drawings” or “Drawings”: The drawings, including reproductions of the Work

prepared or approved by the District.

H. “Contract”, “Contract Documents” or “Agreement”: The “Contract” or “Agreement” constitutes the

entire integrated agreement between the District and the Contractor or the District and the

Developer for the performance of the work.

I. “Contractor”: Means the individual, legal entity or combination thereof contracting with the District

to do the Work. The term also includes the Contractor's agents or employees. The term also

includes the Developer their contractors, agents or employees.

J. “Design”: Means the preparation of the Drawings for the extension or replacement of the District’s

water distribution and/or sewer collection system.

K. “Developer”: The term “Developer” means the owner(s) of property to be benefited by the

proposed extension or that person or organization in charge of developing the project, either on

behalf of the property owner(s) or pursuant to an agreement to purchase the property and

encompasses the Developer’s agents, including the “Contractor” and “Subcontractor”.

L. “Developer’s Engineer”: The “Developers Engineer” is the individual, entity or combination

thereof contracting with the Developer who will be responsible for the design of the Construction

Drawings for the development.

M. “District Engineer”: The Engineering & Development Director, or the Capital Projects Manager of

the Alderwood Water & Wastewater District or their Designee are considered the “District

Engineer”.

N. “District Standards”: The “District Standards” are the written descriptions of services to be

performed, the goods to be provided and/or the technical requirements to be fulfilled under the

Agreement.

O. “Extension(s)”: “Extensions” are the water and/or sewer system and other improvements to be

constructed according to this agreement and connected to the District’s water distribution and/or

sewer collection system and transferred to the District for operation and maintenance.

P. “Final Acceptance” , “Completion”, or "Use and Operations": A written acceptance of the

Extension, Project or Work by the District.




Q. “General Manager”: Means the General Manager of the Alderwood Water & Wastewater District.

R. “Otherwise Specified” or “As Specified”: Means the directions contained in the Drawings,

Specifications, if any, and otherwise as given by the District incident to the performance of the

Work other than these General Specifications.

S. “Participant” or “Participation”: A property owner as identified by the developer that contributes to

an extension that provides service to other parcels, who would not be subsequently charged a

reimbursement fee or local benefit charge.

T. “Policy(ies)”: RCWs, WACs, land use agency regulations, and Commissioner actions, including

resolutions, code sections, and minute entries that govern the activities of the District

U. “Property Owner” or “Owner of Property”: Means the vested owner(s) of the parcel(s) or of the

parcel requesting water and/or sewer service.

V. “Project”: Refers to all activity relative to this Contract including activity of the Developer,

Contractor, its Subcontractor and/or Suppliers, the District and the District’s Project

Representative.

W. “RCW”: Refers to the Revised Code of Washington.

X. “Specifications”: Refers to the directions, provisions, standards and requirements approved by

the District for the performance of the Work and for the quantity and quality of materials.

Y. “Standard Detail(s)”: Means the standard details located in the “District Standards”.

Z. “Subcontractor”: Means the person or firms employed by the Developer or Contractor to do any

part of the Work, all of whom shall be considered agents of the Developer or Contractor.

AA. “WAC”: Refers to the State of Washington Administrative Code.

BB. “Work”: Means the labor, materials, superintendence, equipment, transportation, supplies and

other facilities necessary or convenient to the completion of the Project.

GP-2 Purpose




Alderwood Water & Wastewater District, as a municipal corporation of the State of Washington was organized pursuant to Title 57 RCW, is responsible to the public for insuring that water and sewer facilities are constructed in accordance with currently accepted standards for public works. The requirements imposed upon Developers and Contractors are intended by the District as an Agreement with the Contractor, which incorporates Standards and Specifications as a prerequisite to acceptance of the Work by the District as a part of its system. Privately constructed Extensions will not be permitted to connect to the District's systems unless the Work is performed and paid for in accordance with this Agreement.

GP-3 Authority of District

The District shall have authority to approve, reject or require changes in Drawings designed by Developer's Engineer; to require such changes in the Drawings during the course of work; to inspect the work; to stop work to insure compliance with the approved Drawings and Specifications; to reject non-conforming work and materials; and to decide questions which may arise in the execution of the Work. The District shall have the authority to impose fines for violation of District Policies.

GP-4 District to be Informed

The Contractor shall keep the District fully informed regarding the nature, quality and extent of the Work to be done, and if in doubt, to secure specific instructions from the District. The Contractor shall keep a competent supervisor on the Work during its progress who shall represent the Contractor, and to whom instructions may be given as though to the Contractor. The supervisor shall be familiar with the Drawings and Specifications and shall promptly report to the District any error, inconsistency or omission which may be discovered. The Contractor shall enforce discipline and good order among its employees and shall not employ on the Work any unfit person or anyone not skilled in the work assigned. Employees or agents of the Contractor who may impair the quality of the construction shall be removed from the Work upon the written request of the District.

GP-5 Plans and Specifications Accessible

One copy of the approved Drawings shall be constantly accessible on the job.

GP-6 Final Inspection

All material and completed Work are subject to final inspection and testing by the District to determine whether the Work complies with the Standards and Specifications.

GP-7 Record Drawings/Asbuilt Submittals




On District designed projects, the District shall maintain "record" information based on “as-built” field information provided by the Contractor. Information provided shall include horizontal and vertical location on all water, sewer, side sewer laterals, and other information that the District deems relevant. On Developer's Engineer designed projects, the Developer's Engineer shall maintain and provide the District with as-built construction drawings based on information maintained by the Contractor and the District. Contractor shall submit to the District a neatly and legibly marked set of field as-built construction drawings for District review and approval. These drawings shall be on a copy of the original approved Drawings or as approved by the District and shall include, but not be limited to the following: (see District website for complete as-built requirements)

Manholes/lamphole locations;

Side sewer laterals (including length, depth from finish grade, elevation, and stationing from downstream manhole);

Manhole inverts and rim elevations;

Sewer main location, size, material type, and lengths with grades being adjusted accordingly;

Water main location, size, material type, and length between valves;

Valve depths.

Water and sewer appurtenances that cannot be accessed after backfill shall be accurately measured prior to backfill.

Reference offsets are required for water line bends (angle points) and tee locations if no valve will be available for surface location.

If the design was prepared using computer-aided drafting, provide (an) electronic file(s) containing the record drawing. The electronic record drawing shall be in a form compatible with AutoCAD Version 14 or later with the drawings being assigned the local projection of Washington State Plane North, North American Datum 1983-91, HARN, US Feet and elevation Datum NAVD 88.

Provide a full size set of electronic Adobe PDF format images scanned with a minimum resolution of 300 DPI.

No work will be accepted by the District, until the District has reviewed and approves the record drawings. The final record drawings shall be submitted on mylar and shall bear the stamp and signature of either a registered professional engineer or a registered land surveyor. The Developer's Engineer shall make all changes to the record drawing requested by the District before the District will accept the mylars as a record drawing.




GP- 8 Ownership of Drawings

The originals of all "Record" Drawings prepared by Developer's Engineer shall be delivered to the District as a condition of and prior to acceptance of the project, and shall become the property of the District. Neither Developer nor Developer's Engineer shall have any rights of ownership, copyright, trademark or patent in the Drawings.

GP-9 Quality of Materials and Workmanship

All materials shall be new, and workmanship and materials shall be of the highest quality commonly used. The Contractor shall, if required, furnish satisfactory evidence as to the kind and quality of materials.

GP-10 Materials and Equipment List

The Contractor shall file a material and equipment list with the District on District standard forms (see District website) prior to the preconstruction conference, including the quantity, manufacturer and model number, acceptability under any specified inspections or tests required by ASTM or AWWA specification, if applicable, of material and equipment to be installed as part of the Work. The District may reject materials and equipment which do not conform to District Standards and the approved Drawings. Failure of the District to reject materials and equipment at the time the list is filed shall not be a waiver of the District's right to reject such materials or equipment at a later time.

GP-11 Determination of “As Equal”

The District shall be the sole judge whether supplies or material qualify "as equal" substitutions under the Drawings and Specifications.

GP-12 Omissions and Discrepancies

Minor items of work or materials omitted from Drawings and Specifications prepared by the District or Developer's Engineer, but clearly inferred there from and called for by good practice, shall be provided or performed by the Contractor. In case of doubt, the District's decision shall be final.




GP-13 Inspection and Tests

All work shall be subject to inspection by the District. The District shall have access to the Work at all times, and the Contractor shall provide proper facilities for such access and inspection. The Contractor shall make tests of the Work at the Developer's expense upon the District's request. Whenever work must be specially tested or inspected for compliance with public regulations, or with the Drawings and Specifications, the Contractor shall give the District one business day notice of the readiness of the Work for such test or inspection. The District shall make inspections within a reasonable amount of time after notification by the Contractor. Work shall not be covered up without consent of the District, or it shall be uncovered for inspection at the Contractor's expense. Such inspections and tests shall not relieve the Contractor of any of its responsibilities under this Agreement. The presence or absence of a District inspector on any job is at District’s discretion, and neither the presence nor absence of a District inspector shall relieve the Contractor of responsibility to obtain the construction results specified in this agreement. The District is not a safety expert, and is not engaged in that capacity whenever performing inspections and tests. The authority of the District to perform inspection and tests shall not relieve the Contractor of its responsibility for safety as specified in GP-33.

GP-14 Compliance with Public Authority

The Work shall conform to the regulations of each public authority with jurisdiction over the manner and quality of performance of the Work. Construction in public roads or rights-of-way shall conform to the standards and requirements of the governmental agency having jurisdiction, and to the requirements of the District franchise or agency permit; whichever is more stringent shall apply. Construction outside of the public roads or rights-of-way shall conform to all standards and requirements of the governmental agency having jurisdiction and any easement conditions. The Developer shall be responsible for ascertaining the requirements of each public authority and the franchises and permits. The Contractor shall be responsible for assuring compliance with the requirements of all permits,

franchises, easements and licenses and for payment of all associated costs. The Contractor shall

also comply with County, City or State Correction Notices in the time period noted. Should the

Contractor not respond in a timely manner, the District may hire a contractor to perform the work

and bill the Contractor for all costs.

The Contractor shall be responsible for coordinating construction activity with all interested parties and agencies. The Contractor shall be responsible for investigating and ascertaining the requirements of the appropriate public authorities.

The Contractor shall comply with all jurisdictional and District rules, policies, and regulations governing non-stormwater discharge as provided in District Resolution.




GP-15 Cross Connection Control

Contractor shall comply with all government and District rules and regulations prohibiting cross-connections. Contractor shall install and maintain backflow prevention devices as required by the District to isolate the newly constructed sewer and water systems from the District’s system. In addition, an inspection or test report from a State-approved inspector shall be required as a condition of receiving final acceptance of the Extension improvements and utility service from the District for water system. Refer to the current Alderwood Water & Wastewater District Cross Connection Control Manual to comply with the District’s policies and standards.

GP-16 No Storm Water Discharge

The Contractor shall comply with the District rules, policies, and regulations prohibiting the

discharge of stormwater in to the District’s sewer system. In the event the Extension is in another

jurisdiction’s sewer service area, the Contractor shall comply with that jurisdiction’s rules, policies,

and regulations.

GP-17 Pre-Construction Conference

The District shall hold a pre-construction conference with all Concerned Parties at the District’s office before work on the Extension(s) commences. The Contractor or their agent shall submit all pertinent information required on the pre-construction checklist provided prior to requesting a preconstruction meeting. The Contractor shall coordinate with District staff for the attendance of the Concerned Parties. The Contractor shall attend the pre-construction conference. The pre-construction conference requires a minimum of five (5) working day advance scheduling with the District.

GP-18 Permits

The District will not schedule a pre-construction conference with the Contractor for installation of water or sewer until all necessary permits have been issued by public authority and are in District possession or other suitable evidence of permit application is delivered to the District. The Developer shall pay the cost of obtaining all required permits, and shall reimburse the District for all costs incurred by the District for permits, inspection fees and other charges imposed by public authority because of the Work. The Contractor shall be responsible for assuring compliance with the requirements of all permits, franchises, and licenses.




GP-19 Survey Control

The Developer shall provide all horizontal and vertical control, including property corners and street centerline and grade stakes, and shall provide reasonable and necessary survey control to install the water and sewer facilities at their designated horizontal and vertical locations. All vertical and horizontal control staking shall be under the direction of a licensed land surveyor or professional engineer. Horizontal and vertical control should be established using the District’s horizontal coordinate system and vertical datum. The surveyor shall use the District's approved plan information to stake proposed utilities.

The Work shall not commence until the Contractor has made provision to establish such points necessary for the Work. The Work shall conform to such points and instructions. The Contractor shall preserve survey monuments, bench marks, reference points and stakes, and in case of destruction, shall re-established as required by state law and shall be responsible for any errors that may be caused by their absence or disturbance.

GP-20 Restoration of Improvements

All existing improvements removed or disturbed during the Work shall be restored to their original condition. A signed letter of restoration (see District website) from the affected property owner shall be required where existing District facilities are removed or disturbed or new District facilities are installed. All letters of restoration shall be submitted to the District prior to acceptance of the project for use and operations. All restoration shall be made at Developer's expense to the condition of the area prior to construction. Whenever restoration of existing improvements will be necessary, the Contractor shall provide the District photographs before the start of work and after construction restoration. Photos shall be date stamped, with sufficient information to determine exact location where the picture was taken.

GP-21 Access

Access to private driveways and roads shall be provided by bridging or other method whenever trenches are open to provide for ingress and egress. Contractor is responsible to provide safe access to vehicle, pedestrian, and bicycle traffic.

GP-22 Specifications Incorporated By Reference

Where Standard Details or Specifications are referenced or included by reference herein, the latest version or amendment shall be incorporated into the Agreement. Should a conflict exist between the Drawings and any Standard Details Specifications referenced herein, the District shall determine which shall prevail.




GP-23 Use of Completed Portions

The District may take possession of and use any completed or partially completed portions of the Work. Possession and use shall not constitute acceptance of any of the Work.

GP-24 Existing Utilities or Obstructions

Preparation of Drawings by District. Existing utilities and obstructions are shown on the Drawings so far as known to the District. The information is not guaranteed and is provided only for such value as it may have. Incomplete or erroneous information shall not be the cause of claim against the District, its employees or agents and shall not relieve the Contractor of responsibility for repairing any damage caused to such utilities during performance of the Work. Preparation of Drawings by Developer Engineer. The District shall provide to the Developer any information it may have regarding existing utilities and obstructions. The information is not guaranteed but is provided only for such value as it may have. Incomplete or erroneous information shall not be the cause of claim against the District, its employees or agents and shall not relieve the Contractor of responsibility for repairing any damage caused to such utilities during performance of the Work. Notification of Utilities. Immediately preceding construction, the Contractor is responsible to follow the requirements set forth in RCW 19.122. The Contractor shall determine whether existing utilities and obstructions exist. The Contractor shall reimburse the District for damage to the property of the District or damage to property of others for which the District’s liability is caused by the Contractor and for other expenses, including reasonable attorneys' fees and court costs incurred by the District because of such damage. Whenever the Contractor fails to repair or restore existing improvements damaged within 72 hours of notice, the District may order the work done by others and all costs incurred shall be paid by the Contractor; provided that if the District determines an emergency exists, it may notify the Contractor who shall immediately commence repair or restoration work, or it may make repairs or restoration at the Contractor's expense.

GP-25 Site Maintenance

The construction site shall be kept clean during the Work. Before the Work shall be considered complete, the Contractor shall clean out ditches; replace damaged surfacing; remove surplus materials, trash and brush; repair all damages; and otherwise leave the job in a neat and orderly condition. Dust control shall be provided during mobilization, set up, while the Work is being performed and during cleanup. The Contractor shall keep existing roads and streets adjacent to or within the limits of the project open to and maintained in a good and safe condition for traffic at all times. The Contractor shall remove, on a daily basis, any deposits or debris which accumulates on the roadway surface as a result of construction operations. Removal shall be performed on a more frequent basis should the District determine that such removal is necessary. District owned infrastructure (i.e., manholes, valve boxes, meters, hydrants, etc.) shall be accessible at all times. Access to mailboxes shall be provided at all times during construction.




Pedestrian and vehicular access to occupied buildings shall be maintained at all times except where approval from the building owner has been obtained. The Contractor shall follow all requirements under the jurisdictional authority's grading or land disturbing permit and guidelines for erosion control.

GP-26 Public Hazard or Inconvenience

If performance of the Work results in a hazard or inconvenience to the public, then the District may correct the same, and the Contractor shall reimburse the District for the expense incurred. The Contractor shall also reimburse the District for the expense incurred in complying with any order of public authority lawfully made with respect to the Work during the performance of the Work or within one year after acceptance of the same.

GP-27 Protection of Work and Property

The Contractor shall exercise due care to protect property and the Work and shall supervise the project to ensure the Contractor exercises such care. The Contractor shall be solely responsible for any loss or damage to property or the Work occurring prior to the completion of and acceptance of the Work by the District.

GP-28 Royalties and Patents

Contractor shall pay all royalties and license fees and defend all suits or claims for infringement of any patent rights and shall save the District harmless on account thereof, unless a particular process or the product of a particular manufacturer is specified by the District and the Contractor are unaware that the process or article is an infringement of a patent.

GP-29 Other Work

The District may allow other Agreements affecting the Work. The Contractor shall provide reasonable opportunity to other Contractors to reasonably and efficiently perform their Work.

GP-30 Contractors

Only general contractors or utility contractors licensed and bonded with the State of Washington shall install water or sewer Extensions; a copy of the license shall be provided to the District. Nothing contained in this Agreement shall create any contractual rights between the District and any person or firm employed to do the Work.




GP-31 Traffic Maintenance and Protection

All work shall be performed with due regard for the safety and convenience of the public and in a manner that minimizes interference with automotive, pedestrian, and bicycle traffic. Certified flagging personnel, barricades, signs and traffic control shall be furnished as required by appropriate agency. Emergency vehicles shall be provided access at all times.

GP-32 Sanitation

Necessary sanitation convenience properly secluded from public observation shall be provided and maintained during the Work as required by law.

GP-33 Safety

The Contractor shall be solely and completely responsible for conditions of the job site, including safety of all persons and property during the performance of the Work, and for compliance with all federal, state and local safety laws and regulations. This requirement shall apply continuously and shall not be limited to normal working hours. The right of the District to conduct construction review of the Contractor's performance or inspection of the Work or the site is not intended to include review of the adequacy of the Contractor's safety measures in, on or near the construction site. In accordance with State of Washington WAC 296-809, Confined Spaces, the District has implemented a confined space program. Implementation of this program requires specific procedures for evaluation of hazards and subsequent entry into confined spaces. Vaults, pits, manholes, dry wells, water pump stations and sewer lift stations are all considered examples of confined spaces. Other construction related activities under certain circumstances, such as trenches, are also considered confined spaces. Entry into confined spaces by District staff can only be accomplished under compliance with the adopted program. Currently, the District is providing required staff and equipment support to the District's project inspectors for confined space entry. This requires at least a three (3) working day advance scheduling with the District. Contractor shall anticipate this required advance notice when inspections of confined spaces are desired.

GP-34 Confinement of Contractor's Operations

The Contractor shall ensure that the Contractor confines construction activities within the property of the Developer and the limits of easements and construction permits outside of the Developer's property. Damage to property or persons from any encroachment beyond these limits shall be the responsibility of the Contractor.




GP-35 Alignment

The Developer shall furnish sufficient horizontal control, including lot stakes, for locating and staking the lines and appurtenances. Accuracy of such horizontal control is the sole responsibility of the Contractor and any modification of horizontal location of any facility shall be subject to the approval of the District and at the Developer's expense.

GP-36 Taps, Cut-Ins and Large Meter Installation

All taps and cut-ins to the existing water and sewer mains shall be made by the District, unless otherwise approved by the District, at fees established by District Resolution. When approved by the District sewer manholes may be core drilled by the Contractor. When a project requires meters three inches or larger, the meter installation, including valves, piping, vaults, drain lines and meters, the Work shall be performed by the Contractor according to District Standard Details for those installations. The Developer shall complete the appropriate paperwork and pay all associated fees and charges due.

GP-37 Recording

The District will not approve the Plat for recording until all of the underground portion of the Extension(s) have been installed, tested, and in the case of sewers, televised, and all charges and fees due are paid in full. A copy of the proposed final plat shall be delivered to the District before recording for review of adequacy of easements. A copy of the final recorded plat and all necessary recorded easements shall be delivered to the District before service connections will be allowed to the Extension.

GP-38 Cost of Water

Construction water shall be furnished to Contractor in accordance with policies of the District at rates established by District Resolution.

GP-39 Easements Criteria

Water or sewer improvements that are to be a part of the public system shall be constructed in public right-of-ways or easements. All easements for water and sewer utilities shall be a minimum of fifteen (15) feet in width. Joint use easements with water and sewer utilities shall be a minimum of twenty five (25) feet in width. The District may require greater easement widths to accommodate larger pipe sizes, excessive depths, access needs, or other special requirements. Minimum separation between water and sewer utilities shall be in accordance with District and State standards. All easements shall be located to run within single lots or tracts adjacent and parallel to property lines rather than being split by a lot line. No permanent structures, obstructions, encroachments,




or fill are allowed within the easement area after utilities are installed. See the District standard easement form for complete description of restrictions.

GP-40 Deviation

Alternates to the Standards may be approved by the District upon review of materials submitted by the Contractor that such modifications: 1. Are equal to or better than the requirements in these Standards. 2. Are in the public interest. 3. Are based upon sound engineering judgment and practices. 4. Fully meet the requirements for safety, function, appearance, and maintenance. Requests for proposed alternates should be submitted as soon as possible to allow time for review and decision by the District. Requested alternates shall be reviewed and approved prior to construction.

The District shall make the decision as to whether a requested alternate will be allowed.

Alderwood Water & Wastewater District Adopted 4-24-2017 Standards & Guidelines Division 2 – Water Installation Page 1 of 17

DIVISION 2

Standards

for

Water Installation


Division 2

Standards for Water Installation

Table of Contents Standards for Water Installation .............................................................................................. 2 2-1.000 WATER ..................................................................................................................... 4 2-1.010 General ..................................................................................................................... 4 2-1.020 Construction Standards .......................................................................................... 4 2-1.030 Water Treatment Chemicals ................................................................................... 4 2-1.040 Materials in Contact with Drinking Water .............................................................. 4 2-2.000 MATERIALS AND INSTALLATION .......................................................................... 4 2-2.010 General ..................................................................................................................... 4 2-2.020 Pipe Material ............................................................................................................ 5 2-2.025 Pipe Installation ....................................................................................................... 6 2-2.030 Fittings and Adapters .............................................................................................. 8 2-2.040 Gate Valves .............................................................................................................. 8 2-2.045 Butterfly Valves ....................................................................................................... 8 2-2.050 Valve Boxes ............................................................................................................. 9 2-2.060 Valve Stem Extension ............................................................................................. 9 2-2.070 Installation of Valves and Fittings .......................................................................... 9 2-2.080 Marker Posts ............................................................................................................ 9 2-2.090 Standard 5-1/4 Inch Fire Hydrants .......................................................................... 9 2-2.095 Fire Hydrant Installation ....................................................................................... 10 2-2.120 Fire Hydrant Guard Posts ..................................................................................... 10 2-2.130 Water Service Installations ................................................................................... 10 2-2.140 Air and Vacuum Valves ......................................................................................... 11 2-2.150 Blowoff Assembly ................................................................................................. 11 2-2.160 Anchor Rods, Shackle Rods and Restraints ....................................................... 11 2-2.170 Water Main Taps or Cut-Ins .................................................................................. 11 2-2.180 Blocking ................................................................................................................. 12 2-2.190 Typical Procedure for Filling, Flushing and Testing ........................................... 12 2-2.200 Sterilization ............................................................................................................ 13 2-2.210 Pressure Testing ................................................................................................... 13 2-2.220 Flushing Water Line .............................................................................................. 14 2-2.230 Purity Samples ...................................................................................................... 14 2-2.240 Vertical Bends ....................................................................................................... 14 2-2.250 Backflow Assemblies ............................................................................................ 14 2-3.000 Early Water System Access .................................................................................. 15 2-3.020 Construction Meter(s)........................................................................................... 15 2-3.030 Model Home Meter(s) for Recorded Plats ............................................................ 16 2-4.000 Abandoning Existing Water System ................................................................... 17


DETAILS Standard Depth Requirements................................................................................................. WD-1 Meter Boxes and Lids..................................................................................................................... WD-2 Open................................................................................................................................................ WD-3 1” Service....................................................................................................................................... WD-4 Meter Setter 1” Service………………………………………………………………………………… WD-4A Block-Out for Meter Boxes in PCC Driveways............................................................................WD-4B Pressure Reducing Valve ¾” -2”………………………………………………….…………………….WD-4C 1 ½” & 2” Service Installation.......................................................................................................... WD-5 2” Blowoff Assembly (Non-Paved Areas)................................................................................... WD-6 2” Blowoff Assembly (Paved Areas)............................................................................................. WD-6A Fire Hydrant Assembly................................................................................................................. WD-7 Hydrant Use Requirements and Approved Locations............................................................. WD-8 Relocate/Replace Existing Fire Hydrant Assembly................................................................. WD-9 Open............................................................................................................................................... WD-10 Thrust Block Details...................................................................................................................... WD-11 Thrust Blocking for Vertical Bends............................................................................................. WD-12 Cast Iron Valve Box...................................................................................................................... WD-13 Valve Stem Extension.................................................................................................................. WD-14 Valve Box Adjustment.................................................................................................................. WD-15 Tapping Tee & Valve.................................................................................................................... WD-16 Hydrant Guard Posts.................................................................................................................... WD-17 Valve Marker Post........................................................................................................................ WD-18 1” Combination Release Air & Vacuum Valve (APCO)............................................................. WD-19 2” Combination Release Air & Vacuum Valve (APCO)........................................................... WD-19A 1” Combination Release Air & Vacuum Valve (ARI)............................................................... WD-19B 2” Combination Release Air & Vacuum Valve.(ARI)............................................................... WD-19C Private Fire System Double Check Detector Assembly(profile view)......................................WD-20 Private Fire System Double Check Detector Assembly(plan view).........................................WD-20A Open............................................................................................................................................... WD-21 3” & 4” Service Installation........................................................................................................... WD-22 4” By-Pass Valve.......................................................................................................................... WD-23 Double Check Valve Assembly (DCVA) ¾” to 2”..................................................................... WD-24 Reduced Pressure Backflow Assembly (RPBA) ¾” to 2”....................................................... WD-25 Reduced Pressure Backflow Assembly (RPBA) 3” or Larger................................................ WD-26 Above Ground Detector Check Valve Assembly (DCVA) 3” or Larger................................. WD-27 Reduced Pressure Detector Assembly (RPDA) 3” or Larger................................................. WD-28


2-1.000 WATER

2-1.010 General Any extension of the District’s water system shall be completed in accordance with the terms of the agreement and/or contract between the District and the Contractor. Each single family residential lot and commercial building shall be serviced by a single metered water service connection perpendicular to the public main. All extensions shall conform to State of Washington Department of Health (DOH), District and other local authority requirements. In planning for any development, it shall be the Contractor's responsibility to ensure adequate water can be obtained to satisfy all domestic and fire flow requirements. The Contractor shall coordinate with the District and the local fire authority. The Contractor shall comply with all of the requirements for back flow protection and cross connection control to protect the District’s water system. The developer may be required to extend water main to the neighboring properties unless approved otherwise by the District, or close dead end loops to the water system.

2-1.020 Construction Standards All materials, installation and workmanship shall be in accordance with the latest District Standards, the latest edition of the State of Washington‘s Standard Specifications for Road, Bridge and Municipal Construction as amended by the District, American Water Works Association (AWWA) guidelines, and the governing jurisdictional authority.

2-1.030 Water Treatment Chemicals Any chemicals used in the water treatment shall comply with the requirements of ANSI/NSF 60 Water Treatment Chemicals.

2-1.040 Materials in Contact with Drinking Water Any products used to coat, line, seal, or patch water contact surfaces (paint, pipe liners, interior tank coating) or that have substantial water contact within the supply, pumping, treatment, or distribution system shall comply with ANSI/NSF 61 Drinking Water System Components and Materials, and the Safe Drinking Water Act

2-2.000 MATERIALS AND INSTALLATION

2-2.010 General Water mains to be installed shall be ductile iron pipe for all sizes, unless specifically noted or otherwise approved, such as HDPE for use in some trenchless installations under Division 6. The Contractor shall furnish all material as noted herein and as indicated on the Construction Drawings and as required to complete all work. All materials shall be manufactured with


premium material and comply with all referenced standards. The Contractor shall complete the installation of all furnished materials in accordance with Division 2-1.020 Construction Standards.

2-2.020 Pipe Material A. Ductile iron pipe shall conform to ANSI/AWWA. C151/A21.51 Standards. The minimum

nominal thicknesses shall be as follows:

Diameter

(inches)

Minimum Nominal Thicknesses

(inches)

Pipe Class

3 0.31 53

4 0.32 53

6 0.31 52*

8 0.33 52*

10 0.35 52

12 0.37 52

14 0.36 51

16 0.37 51

18 0.38 51

20 0.39 51

24 0.41 51

30 0.43 51

36 0.48 51

The District may require thickness classes greater than the minimums shown or require zinc

coating, and/or poly bags for special circumstances as determined by the District. B. Grade of iron shall be 60-42-10. The pipe shall be cement mortar lined with a standard

thickness lining and the exterior shall be coated with an asphaltic coating. C. Each length shall be plainly marked with the manufacturer's identification, year cast or

casting period, thickness and class of pipe. The pipe shall be furnished with mechanical joint (MJ) or push-on joint, conforming to ANSI/AWWA C111/A21.11 Standards, except where otherwise specified for flanged or restrained joints on the Construction Drawings.

D. Ends of pipe lengths shall be sealed prior to shipping and delivery to site. E. Restrained joint pipe shall have a bell and spigot locking mechanism such as TR Flex, Snap

Lok, or similar. When a field cut of pipe due to dimensions less than a full stick of pipe is needed, a gasket with a locking mechanism may be used with prior District approval.

F. The pipe manufacturer shall be able to certify in writing, upon request, that the inspection

and all of the tests specified in the applicable AWWA standards for both pipe and gaskets

* Note – Class 53 required when pipe requires threaded or special

fabricated fittings.


being supplied have been made, and the results constructed in compliance with that standard.

G. Joints shall be "made up" in accordance with the manufacturer's recommendations. Standard joint materials, including rubber ring gaskets, shall be furnished with the pipe. Materials shall be suitable for the specified pipe sizes and pressures. 2-2.024 Survey Staking

Survey line and grade shall be established to successfully install the District’s utilities at the correct horizontal and vertical locations. At a minimum, all fittings, valves, hydrants, services and other appurtenances shall have field staking installed under the supervision of a licensed land surveyor to provide sufficient horizontal and vertical control.

2-2.025 Pipe Installation A. Preparation of Trench: The trench shall be excavated to the depth specified on the

Construction Drawings. Grades shall be established using approved pipe laying methods to achieve elevation accuracy of 0.10 (+/-) feet. Support of pipe on blocking shall not be permitted.

Prior to pipe installation, all road grades shall be established to within 6-inches of subgrade,

or the entire alignment shall be staked with cut elevations. Any part of the bottom of the trench excavated below the uniform required grade shall be corrected by bringing up to grade with Foundation Gravel listed in Section 7 of these standards, and compacted to District standards for compaction.

B. Extra Depth: Minimum depth of cover shall be required as shown on the Construction

Drawings and Standard Details. The District may require depth to be increased to avoid utility conflicts, avoid high points requiring air & vacuum valves, to provide undisturbed soil for adequate thrust blocking support or for other engineering reasons as determined by the District.

C. Unloading and Stockpiling Pipe, Fittings and Other Materials: It shall be the Contractor's

sole responsibility to supervise the delivery, unloading and stockpiling of pipe, fittings and any other necessary materials to safeguard and insure public and private safety. Public and private access to properties shall not be obstructed.

All pipe shall be unloaded from delivery vehicles with mechanical equipment. Dropping of pipe onto the ground or mats shall not be permitted.

D. Materials Furnished But Not Used: All materials listed on the Construction Drawings

and which are not incorporated into the Work shall remain the property of the Contractor unless purchased by the District.

E. Laying: All pipe, fittings, valves, and fire hydrants shall be carefully lowered into the trench in

a manner as to prevent damage to pipe materials and protective coatings and linings. Under no circumstances shall materials be dropped or dumped into the trench.


The pipe and fittings shall be inspected for defects prior to installation. All lumps, blisters and excess coating shall be removed from the bell and spigot end of each pipe, and the outside of the spigot and the inside of the bell shall be wire brushed and wiped clean and dry and free from debris and lubricants before the pipe is placed in the trench.

Every precaution shall be taken to prevent foreign material from entering pipe while it is being installed. After placing a length of pipe in the trench, the spigot end shall be centered in the bell and the pipe forced home and brought to correct line and grade. The pipe shall be secured in place with bedding material tamped under it. Precautions shall be taken to prevent dirt from entering the joint space. When pipe laying is not in progress, the open ends of pipe shall be sealed with a sanitary watertight plug or sanitary other means approved by the District. If water is in the trench when work resumes, the seal shall remain in place until the trench is pumped completely dry. The cutting of pipe for inserting valves, fittings or closure pieces shall be done in a neat and workmanlike manner without damage to the remaining pipe, coating or cement mortar lining so as to leave a smooth end at right angles to the axis of the pipe. Pipe shall be laid with bell ends facing in the direction of the laying, unless otherwise approved by the District. No pipe shall be laid in water, or when, in the opinion of the District, trench conditions are unsuitable.

Wherever it is necessary to deflect pipe from a straight line, the amount of deflection allowed shall not exceed one-half pipe manufacturers' recommendations for mechanical, restrained and push-on joints.

F. Aggregate, Trenching, Backfill and Restoration: See Division 7.

G. Mechanical Joints: The socket, plain end of each pipe and gasket shall be cleaned of dirt

before jointing and shall be jointed according to manufacturer's recommendations. Bolts shall be tightened alternately at top, bottom and sides so pressure on gasket is even.

H. Push-on Joints: Jointing shall be performed according to these specifications and the

manufacturer's recommendations with special care used in cleaning gasket seat to prevent any dirt or sand from getting between the gasket and pipe. Lubricant to be used on the gasket shall be nontoxic and free from contamination. When a pipe length is cut, the outer edge of the cut shall be filed to a beveled edge to prevent injury to the gasket while joining.

I. Restrained Joint Pipe: Restrained joints, where called for on the Construction Drawings,

shall be installed in accordance with the manufacturer recommendations and per Division 2- 2.020.

J. Trench Dams: See Division 7, Section 3.010 and Standard Detail TBR-4. K. Installation on Steep Slopes: See Standard Detail TBR-5.

L. When metallic pipes are installed in locations of active or abandoned sewer drain fields, the

metallic pipe shall be wrapped using American V-Bio Poly Encasement or equal and the pipes bedded and covered with 6” of clean, imported material.


2-2.030 Fittings and Adapters All fittings shall be short-bodied, ductile iron complying with applicable ANSI/AWWA C110/A21.10 or C153/A21.53 standards for 350 psi working pressure rating for mechanical joint fittings and 250 psi working pressure rating for flanged fittings. All fittings shall be cement mortar lined and either mechanical joint or flanged, as indicated on the Construction Drawings. Fittings shown on the Construction Drawings for restrained joints shall be either flanged or mechanical joint fittings with a mechanical joint restraint device. The mechanical joint restraint device shall have a working pressure of at least 250 psi with a minimum safety factor of 2:1 and shall be EBAA Iron MEGALUG or MEGAFLANGE, Romac RomaGrip, Star Stargrip 3000, Sigma One Lok, Ford Uni-Flange 1400D or approved equal. All couplings shall be ductile iron mechanical joint long sleeves. If connecting to non-ductile iron pipe, consult with the District. Water line installed across bridges, culverts, or above large areas of material fill may be required to install EBAA Iron Force Balanced Flex-tend flexible expansion joints or equal.

2-2.040 Gate Valves All gate valves shall conform to ANSI/AWWA C509 or C515 Standards for resilient-seated gate valves. The valve seating shall be of the Resilient Wedge (R/W) Type Only. The valves shall be iron-bodied, iron disk encapsulated with rubber and bronze or with epoxy coating and a non-rising stem with "o" ring seals. The sealing rubber shall be permanently bonded to the disk to meet ASTM tests for rubber to metal bond ASTM D429. All valves shall be rated for 200 psi or higher depending on system operating pressures. The valves shall open counter-clockwise and be furnished with 2-inch square operating nuts. All surfaces, interior and exterior shall be fusion bonded with epoxy coating and acceptable for potable water. All valves shall be vertical mounted. Manufacturers not complying with the above specification or not providing requested product references shall be grounds for rejection of use within the District.

2-2.045 Butterfly Valves Butterfly valves shall conform to AWWA C504 for flanged and C-111 for MJ, Class 150B or 250B If the District allows the use of butterfly valves based on design requirements and/or anticipated operating pressure, a flanged 250B valve may require an adaptor for the bolt pattern. No field substitutions, only submitted and approved valves will be allowed. The following listed butterfly valves are acceptable or approved equal.

Pratt - Groundhog Class 150B

M & H - Style 4500 Class 150B or 250B

Mueller - Lineseal III Class 150B

Mueller - Lineseal XPII Class 250B


2-2.050 Valve Boxes All valves, unless otherwise specified, shall be furnished as shown of the Construction Drawings and meet the requirements on Standard Detail WD-13.

2-2.060 Valve Stem Extension This item shall be furnished as shown on Standard Detail WD-14 and the Construction Drawings for all valves with operating nuts below 3 feet from the ground surface. Number and length of extensions shall be determined during construction.

2-2.070 Installation of Valves and Fittings Valves, fittings, plugs and caps shall be set and jointed to pipe in the manner specified for cleaning, laying and joining pipe. All dead ends on new mains shall be closed with Tyton or MJ plugs or dead-end MJ caps with a blow-off or fire hydrant assembly as shown on the Construction Drawings. Valve spacing shall not exceed 1000 feet.

2-2.080 Marker Posts A marker post shall be furnished and installed with each valve that is not located within a paved area. See Standard Detail WD-18.

2-2.090 Standard 5-1/4 Inch Fire Hydrants Fire hydrants shall have two 2-1/2-inch hose outlets; one 4-1/2-inch pumper outlet (National Standard threads); 5-1/4-inch main valve opening; 1-1/4-inch pentagon operating nut, opening in a counterclockwise direction; and a positive and automatic barrel drain. Fire hydrants shall be approved by the National Board of Fire Underwriters and shall conform to AWWA C502 Standards. Fire hydrants shall be provided with a mechanical joint shoe. Fire hydrants shall be provided with a breaking flange or lugs as shown in the Standard Details. Fire hydrants shall include a 4-inch NST thread Storz adapter. Only the fire hydrants shown on Standard Detail WD-7 shall be accepted. Only one fire hydrant shall be installed on any dead-end 8-inch main. All dead-end mains that have a fire hydrant greater than 50 feet from a “looped” main shall be 8-inch. Locate fire hydrant near intersections and at lot corners. Spacing shall not exceed 600 feet and no further than 300 feet from the end of a street or private drive. Fire hydrants shall be connected to pipelines with 6-inch ductile iron pipe conforming to Division 2-2.020 and 6-inch Auxiliary Gate Valves conforming to Division 2-2.040. Fire hydrants shall be capable of passing required District test pressure.


2-2.095 Fire Hydrant Installation Fire hydrants shall be installed as shown on Standard Detail WD-7 and WD-9. Fire hydrants shall be connected to the auxiliary valve using 6-inch ductile iron, Class 52 pipe and with all mechanical joint restraint devices. The pipe shall be furnished and installed by the Contractor. Length of pipe shall be as shown on the Construction Drawings. Length may be changed during construction by the District.

2-2.120 Fire Hydrant Guard Posts Guard posts shall be installed at locations shown on the Construction Drawings or as changed during construction by the District. See Standard Detail WD-17 for dimensions and location.

2-2.130 Water Service Installations Service connection material shall comply with the requirements shown on the Construction Drawings and Standard Details. No water meter boxes are allowed in streets, driveways, sidewalks, under decks or porches or roof overhangs unless approved by the District. Splices are not allowed on a water service unless approved by the District. Maximum length of a water service from main to meter is 60 feet for 1-inch services and 40 feet for 2-inch services. 1-inch water services installed on 4-inch ductile iron main shall use an approved saddle listed in the water section detail WD-4 The water service from the meter to the structure is the responsibility of the property owner to maintain. Install per jurisdictional authority. Every single family residence, multi-family building, or commercial building shall have its own separate water service and meter unless approved otherwise by the District. Definitions for this purpose are as follows;

Single family residence recognized by the District's utility billing system and defined as a living area of real property which extends from the foundation and can be metered individually, including a duplex, townhouse or vertical condominium. Multi-family building recognized as such by the District's utility billing system and defined as a multiple unit structure that contains separate individual real property or separate individual dwelling units on floors above the first floor may use a shared meter per building. Commercial building as defined by the District's utility billing system as a non-residential structure designed and built for commercial users and serviced by a separate single water meter, including recreational vehicle parks, hotels and motels.


2-2.140 Air and Vacuum Valves Installation shall be at high points in the main, at the locations and size shown on the Construction Drawings or as added/changed during construction by the District. Installation shall be in accordance with the manufacturer's recommendations and the Standard Detail WD-19 or WD-19A. Efforts shall be made by the Designer to minimize the use of Air and Vacuum valves by designing pipe to be laid at a continuous slope rather than following an undulating grade.

2-2.150 Blowoff Assembly Installation shall be at low points as determined by the District, or dead ends of the mains, at the location and size shown on the Construction Drawings or as added/changed during construction by the District. Installation shall be in accordance with the manufacturer's recommendations and the Standard Detail WD-6 and WD-6A.

2-2.160 Anchor Rods, Shackle Rods and Restraints Anchor rods, shackle rods and clamps shall be a minimum dimension as specified on the Construction Drawings and meet ASTM A36. Threaded ends shall be a maximum of 12-inches. All thread rods shall be stainless steel. All rods, clamps, nuts and washers shall be hot dip galvanized after manufacture, or stainless steel. Coating shall conform to ASTM Al23 for zinc (hot galvanized) coatings. Alternate coatings shall be submitted to the District for approval.

2-2.170 Water Main Taps or Cut-Ins For materials, refer to Division 2-2.030 and Standard Detail WD-16. For all water main taps and cut-ins, the Contractor shall excavate and provide all materials. District forces will make tap, cut-in or connection as shown on the Construction Drawings. If the exact dimensions of pipe connections are not known, the District may require the Contractor to excavate and expose existing pipelines to verify size and fittings required for the District forces to make the connections. The Contractor shall provide at least ten (10) business days notice to the District prior to the requested work and shall schedule operations so as to minimize service outages. Prior to scheduling the work, all materials to be used for the tap, cut-in or connection shall be inspected by the District and the contractor shall expose all utilities to verify there will not be conflicts with the proposed water line installation. The District reserves the right to limit the working hours and number of work locations. For connections that require customer outages or for traffic considerations, the District may require night or weekend work. To the extent possible, taps and cut-ins will be scheduled for Tuesday, Wednesday, or Thursday during business hours selected by the District. Work scheduled for other days or hours will be at the discretion or direction of the District. The Contractor shall provide and use traffic control, and certified flaggers to meet section 1-10 of the Standard Specifications or the standards of the jurisdiction where the work is performed whichever are more stringent. The Contractor shall provide approved shoring, backfill, all restoration, and equipment with an operator for this work.


2-2.180 Blocking Pipe shall be braced to prevent movement. Concrete shall be placed behind all bends, tees, crosses and blow-off assemblies including when restrained joint pipe is installed, unless the blocking is specifically waived by the District. The thrust blocks shall be installed in such manner as to take the kinetic thrust of the water and the test pressure to be applied to the line. The quantity of concrete shall vary with the size of pipe and soil conditions, and shall be sufficient to substantially cover the rear of the fittings and extend to undisturbed earth to meet bearing area requirements. It shall not, however, cover any part of the joints of the fittings. Concrete mix shall be of stiff consistency, and meet the requirements of the WSDOT Standard Specifications, Division 6-02.3(2) B, Commercial Concrete for 3000-lb concrete. A single sheet that is a minimum of 8 millimeter thick plastic shall be used to cover fittings, bolts, etc., to prevent contact with the concrete, and shall be left accessible and free of concrete. Plugs or valves on pipe ends shall be braced against solid earth with concrete in a manner satisfactory to the District. The Contractor shall furnish and install all blocking. If thrust blocking is needed to take immediate thrust, such as in making live connections, the Contractor shall supply and place all bracing, blocking and/or ecology blocks as approved by the District.

2-2.190 Typical Procedure for Filling, Flushing and Testing After compaction test results have been reviewed and accepted by the District, the new main may be filled. Only District employees may operate valves for all filling, testing and flushing operations. In all instances, the Contractor shall utilize a currently approved and tested Washington State double check valve backflow prevention device to protect the potable water supply when filling, flushing and disinfecting the new water main. After the main has been filled, the pipe may be pressure tested prior to flushing if the new chlorinated system is not connected to the District’s existing system. If connected, the chlorinated water shall be flushed from the main in compliance with Division 2-2.220, Flushing Water Line, prior to the pressure test. The pressure test shall be performed per Division 2-2.210. After pressure test has been approved, purity samples will be obtained per Division 2-2.230. All new mains shall be temporarily blocked, satisfactorily pressure and purity tested, and all disinfection water properly disposed of prior to connecting to the existing mains. If field fire flow testing is desired the District shall receive a minimum 10 working days notice. All District costs associated with the testing shall be reimbursed to the District. The District may reject the request for field fire flow tests at its sole discretion.


2-2.200 Sterilization As sections of pipe are constructed and before mains are placed in service, they shall be sterilized in conformance with the requirements of AWWA C651. The final method shall be approved by the District. Chlorinated water shall remain in the new system for a minimum of 24 hours. In the sterilization process, the Contractor shall take particular care when wasting the chlorinated water from the mains to assure that the chlorinated water does no physical or environmental damage to property, streams, storm sewers or any waterways.

2-2.210 Pressure Testing All services shall be open at the corporation stop at the main and tested in conjunction with the main testing. As soon as pipe is secured against movement under pressure, it may be filled with water by the District. Satisfactory performance of air release valves should be checked while the line is filling. After the line has been filled, the pipe may be pressure tested prior to flushing if the new chlorinated system is not connected to the District’s existing system. If connected, the chlorinated water shall be flushed from the main in compliance with Division 2-2.220, Flushing Water Line, prior to pressure test. The water line shall be pumped to a minimum test pressure of 250 psi or 1-1/2 times the static water pressure up to a maximum test pressure of 300 psi. The pressure shall be maintained for a period of 1/2 hour or at the direction of the District. During the pressure test, the quantity of water pumped to maintain the pressure shall be recorded and shall not exceed the leakage rate established in the table created by calculations derived from formula located in WSDOT 7-09.3(23), and modified for ½ hour test. Note one gallon = 128 ounces. Footage divided by 1000, multiplied by chart value, multiplied by 128 = allowable loss in ounces.

Allowable leakage (gallons per ½ hour per 1000 feet)

4 6 8 12 16 18 24 30 36

250 0.24 0.36 0.47 0.71 0.95 1.07 1.42 1.78 2.14

260 0.24 0.36 0.48 0.73 0.97 1.09 1.45 1.82 2.18

270 0.25 0.37 0.49 0.74 0.99 1.11 1.48 1.85 2.22

280 0.25 0.38 0.50 0.75 1.00 1.13 1.51 1.88 2.26

290 0.26 0.38 0.51 0.77 1.02 1.15 1.53 1.92 2.30

300 0.26 0.39 0.52 0.78 1.04 1.17 1.56 1.95 2.34

Diameter (inches)Pressure

(psi)

The pipe will not be accepted until the leakage, as determined by this test, is less than the allowable maximum. The District shall be present when pressure tests are made. Auxiliary hydrant valves shall be open and the fire hydrants tested to the same pressures as the main. New fire hydrants and connections installed on the existing water mains shall be pressure tested, flushed and sterilized by the Contractor


2-2.220 Flushing Water Line After the sterilization process has been followed according to Division 2-2.200, the heavily chlorinated water should not remain in prolonged contact with the pipe. In order to prevent damage to the lining or corrosion of the fittings, the heavily chlorinated water shall be flushed from the fittings, valves, and branches until chlorine measurements match the existing distribution system. Only the District shall operate the existing and new tie-in valves. The Contractor shall not, unless otherwise approved by the District, operate any valve on any section of main that has been accepted by the District. The District has established penalties and fines (per District Policy) for operation of District valves without prior approval by the District, and these penalties are strictly enforced. The Contractor shall ensure compliance with all Federal, State, and local jurisdictional water quality standards. The Contractor shall chemically or otherwise treat the chlorinated water in accordance with AWWA Standards to prevent damage to the affected environment, particularly aquatic and fish life of receiving streams. Refer to Division 2-1.020 and 2-1.030.

2-2.230 Purity Samples Two (2) sets of purity samples shall be obtained at locations specified by the District. Samples can typically be collected Monday through Thursday with results obtained in approximately 3 business days. The Contractor shall install sterile fittings at the identified sample sites. Coordinate sampling with the District representative.

2-2.240 Vertical Bends Vertical bends shall be used only upon approval of by District and in accordance with the Construction Drawings and Standard Details WD-12. Vertical bends are discouraged when other options are available to adjust vertical elevations.

2-2.250 Backflow Assemblies Backflow assemblies shall conform to the latest Washington State Department of Health requirements and the District's Cross Connection Control Program policies. All backflow assemblies under the jurisdiction of the District shall be installed in the public right-of-way or a nearby utility-held easement, at a location immediately downstream of the water meter or immediately downstream of the water service connection if no water meter is present.

See Standard Detail WD-24 for installation of 2-inch and smaller DCVA backflow assemblies.

See Standard Detail WD-25 for installation of 2-inch and smaller RPBA backflow assemblies.

See Standard Detail WD-20, WD-20A for installation of DCVA or DCDA backflow assemblies larger than 2-inch.

See other details as applicable. At a minimum, backflow assemblies shall be installed for the following uses:

Water service connections for: domestic water to facilities identified in WAC 246-290-490 (4) (b) (iii) Table 9 as high-

health hazard facilities


fire systems irrigation systems

All facilities and/or systems where booster pumps or sewer lift stations are to be used.

All facilities where the highest water use is 30 feet or more above the water meter location.

Temporary placement of a properly operating, spring loaded, single check valve is required when determined by the District in order to use a construction meter and shall be located directly behind any meter designated as a "construction meter". All permanent backflow assemblies shall be tested by a Washington State certified Backflow Assembly Tester (BAT) upon installation, and at least annually thereafter. All initial backflow assembly testing shall be conducted in the presence of a District cross-connection control specialist.

2-3.000 Early Water System Access 2-3.010

After the water system is completed as detailed under Section 2-2 above, and when the use of the water system prior to project completion is desired for fire protection or other water uses, the District may approve the charging of water mains for early fire protection or water use subject to the following:

Pressure test completed

System has been flushed

Results from purity test have been received and are satisfactory

All mainline is installed such to provide adequate flows; all valves and all hydrants are operational

All meter setters and boxes are installed and tested

Developer of Record and the District have signed the "Early Water System Access Agreement".

If the Developer requests this option and meets the above conditions, the District may activate the water system. At this time, a copy of the above-referenced Agreement will be sent to the appropriate jurisdiction and Fire Marshal. If a site's only water improvements are for fire protection, Early Water System Access may be denied.

2-3.020 Construction Meter(s)

Construction meters are intended to provide water for construction activities and are not intended as a water source for buildings. The Developer may request construction meter(s) upon execution of the “Early Water System Access Agreement". The District shall review the request for construction meter(s) regarding the number and location. Construction meters shall not be connected directly to building plumbing. Construction meters may require backflow prevention assemblies which will be determined prior to installation of the meter. If a site's only remaining work is the meter, the Construction Meter Request may be denied.


2-3.030 Model Home Meter(s) for Proposed Recorded Plats

At the sole discretion of the District, a limited number of model homes under construction may be able to obtain water meters and permitted side sewer connections if the water and sewer system is complete and able to provide service. The Developer must have the water and sewer system tested and acceptable to receive or give service in accordance with these standards and:

Complete the Punchlist except for Plat Recording

Sign the Early Water or Early Sewer Access Agreement

Provide easements over the water and sewer system for the District to hold in a format acceptable to the District, which will be returned to the developer once recording is complete

Provide copies of the building permits issued by the authority

Provide future legal addresses and billing information on the District’s Service Connection Application form.

Provide $5,000 deposit cash or assignment)for each set of Model Home connections approved, to be returned at Use and Operations

Once the above items are submitted and approved;

Purchase both the meter and side sewer permit as a set

Pay all fees for the meter and side sewer connection The number of Model Homes allowed to obtain meters and side sewer permits are based on the size of the proposed plat and are limited to: Plat Size by Lots Allowed Connections (up to) 3-9 2 10-25 3 26-50 4 51 & up 5 The District reserves the right to terminate this option, reduce the allowed connections, or lock off and suspend service if the intent of this allowance is not met. Homes may not be sold to or occupied by, permanent residents, nor anyone living in a model home that has been granted temporary service until official acceptance from the District. Daily use is allowed. If occupancy is granted before plat recording, the District must be notified. Tampering or removing District meters is not permitted and doing so could revoke the right to obtain meters. The developer is responsible for their agents, builders, and all onsite personnel in this matter.


2-4.000 Abandoning Existing Water System

The portions of the water system that are replaced or no longer needed shall be disconnected from the active water system and abandoned or removed, as directed by the District and the jurisdictional authority. Whichever requirement is more stringent shall apply. At a minimum, all pipe sections that remain in the ground shall be filled with flowable CDF and the ends capped/plugged with fittings containing rubber gaskets that will withstand static pressure. Any pipe, fittings or other removed system components shall be properly disposed of by the Developer/Contractor.

Alderwood Water & Wastewater District Adopted 4-24-2017 Standards & Guidelines Division 3 – Sewer Installation Page 1 of 16

DIVISION 3

Standards

for

Sewer Installation


Division 3

Standards for Sewer Installation

Table of Contents 3-1.000 SANITARY SEWER INSTALLATION ........................................................................ 4 3-1.010 General ..................................................................................................................... 4 3-1.020 Construction Standards ............................................................................................. 4

3-2.000 MATERIALS AND INSTALLATION ........................................................................... 4 3-2.010 General ..................................................................................................................... 4 3-2.020 Pipe Materials ........................................................................................................... 4 3-2.030 Pipe Installation ......................................................................................................... 5 3-2.040 Lampholes ................................................................................................................. 8 3-2.050 Sewer Laterals .......................................................................................................... 8 3-2.060 Precast Concrete Manholes ...................................................................................... 9

3-3.000 TESTING ................................................................................................................. 12

3-4.000 Early Sewer System Access .................................................................................... 14 3-4.010 Existing Buildings .................................................................................................... 14 3-4.020 Model Home Sewer Permit(s) for Single Family Recorded Plats ............................. 14

3-5.000 Bypassing Sewer Flows .......................................................................................... 15 3-5.010 Bypass Flow Through Plugs .................................................................................... 15 3-5.020 Bypass Pumping or Hauling .................................................................................... 15

3-6.000 Abandoning Existing Sewer System ........................................................................ 16


DETAILS Open S-1

Open S-2

Standard Precast Manhole S-3

Saddle Manhole S-3A

Polypropylene Ladder & Manhole Steps S-4

Manhole Frame and Cover S-5

Shallow Manhole S-6

Open S-7

Drop Manhole Connection S-8

Force Main, Drop Manhole Connection S-8A

Lamphole/Cleanout S-9

Sewer Lateral - New Construction S-10

Alternate Sewer Lateral – New Construction S-10A

Standing Sewer Lateral – New Construction S-10B

Sewer Lateral – Existing Mains S-11

1-Inch Ai/Vacuum Release S-12

Valve Marker Post S-13


3-1.000 SANITARY SEWER INSTALLATION 3-1.010 General Any extension of the District sanitary sewer system shall be completed in accordance with the terms of the Agreement or Contract. The developer will be required to extend sewer service to the neighboring properties unless approved otherwise by the District. All sanitary sewer extensions shall conform to the “Criteria for Sewage Works Design” prepared by the Washington State Department of Ecology (Ecology), the District’s Standards and other local authority requirements. Prior to construction, the District may require an approved set of plans from Ecology (WAC 173-240-030) to be filed in the District offices. 3-1.020 Construction Standards All materials, installation and workmanship shall be in accordance with the latest District Standards, the latest edition of the State of Washington‘s Standard Specifications for Road, Bridge and Municipal Construction as amended by the District, American Water Works Association(AWWA) guidelines, and the governing jurisdictional authority as determined by the District. 3-2.000 MATERIALS AND INSTALLATION 3-2.010 General The Contractor shall furnish all materials noted and as listed on the Construction Drawings and required to complete the work. All materials shall be manufactured with premium materials. 3-2.020 Pipe Materials

Sewer Material Standard

Type PSM, Polyvinyl Chloride (PVC)

Sewer Pipe

ASTM D 3034 SDR 35

Ductile Iron

ANSI/AWWA C151/A21.51,

AWWA C116 ceramic epoxy lined.

Class 50 for 6"-16" up to 28 feet deep

Class 51 for 18"-20" up to 28 feet deep

Class 52 for 24" up to 28 feet deep

Polyvinyl Chloride (PVC) Pressure Pipe

C-900 4" - 12"

C-905 12" - 24"

ANSI/AWWA C-900 & C-905, DR 18

High Density Polyethylene Pipe (HDPE)

ASTM D3350 SDR 9 Force Mains, SDR 11 Gravity Sewer

Cast in Place Pipe (CIPP)

ASTM F1216 or ASTM F1743


As a general rule, ductile iron shall be used: 1. at depths under 5 feet (3 foot minimum cover)* 2. at depths over 16 feet* 3. when sewer mains follow lot lines within easements 4. at stream crossings 5. through casing pipes 6. in areas of fill 7. for pipe diameters 18 inch and greater; and 8. other instances when the District determines ductile iron pipe is warranted.

Where Ductile Iron Pipe is being installed, pipe shall be lined with Protecto 401 Ceramic Epoxy Lining or an approved equal lining.

C 900 or C 905 may be used: 1. at depths under 5 feet (3.5 foot minimum cover)* 2. at depths 6 – 20 feet* 3. for diameters 18 inch and greater up to depths of 20 feet

HDPE pipe may be used: 1. in areas of fill 2. for sewer force mains 3. in steep slopes 4. at stream crossings 5. through casing pipes

CIPP may be used in rehabilitation of existing lines only when upsizing in the future will not be necessary and upon approval by the District. Refer to Division 6, Trenchless Installation.

* Depths are measured from top of pipe to finish grade

Force mains shall be ceramic epoxy coated and lined with Protecto 401 Ceramic Epoxy or an

approved equal lining, restrained joint Class 53 Ductile Iron or High Density Polyethylene SDR 9

unless approved otherwise by the District. Testing of force mains shall be in accordance with

pressure testing for water mains. No TV inspection will be required.

3-2.025 Survey Staking

Survey line and grade shall be established to successfully install the District’s utilities at the correct horizontal and vertical locations. At a minimum, all manholes, lampholes, side sewers, and other appurtenances shall have field staking installed under the supervision of a licensed land surveyor to provide sufficient horizontal and vertical control. Sewer main line shall have additional staking for alignment and grade at 25 feet and 50 feet out of each manhole, in the direction of installation, typically traveling upstream.

3-2.030 Pipe Installation A. General Standards: All pipe shall be unloaded from delivery vehicles with mechanical

equipment. Dropping of pipe onto the ground or mats shall not be permitted. All pipe and fittings shall be carefully lowered into the trench in such a way as to prevent damage to sewer main and protective coatings and linings. Under no circumstances shall materials be dropped or dumped into the trench.


Trench widths at the bottom of the excavation shall meet the minimum width as shown in Division 7, Standard Detail TBR-1 for the pipe diameter. In the event that these widths are exceeded, a stronger grade of pipe, higher pipe class and/or a greater amount of bedding material may be required by the District. Bell holes shall be excavated in the bedding material to allow for unobstructed assembly of the joint. Care should be taken that the bell hole is no larger than necessary to accomplish proper joint assembly. When the joint has been made, the bell hole should be carefully filled with bedding material to provide for support of the pipe throughout its entire length. Immediately upon beginning pipe installation, the Contractor shall place and secure a heavy duty watertight plug in the sewer main at the new or existing manhole as directed by the District; plug shall be secured with a chain and attached to the ladder inside the manhole. The plug shall remain in place throughout the project until such time as the project is accepted by the District. Failure to place the plug or removal of a plug prior to District acceptance shall be grounds for District issued penalties as established by resolution. Contractor is responsible to remove plug upon final acceptance of the sewer. Under no circumstances shall the Contractor be allowed to discharge flows from the new sewer main into the District system until or unless approved by the District. Gravity sewers shall be designed and installed in a straight alignment with uniform grade and pipe type between manholes. Variance from established line and grade can be up to one-inch (1"), provided that it falls within a localized area not to exceed 20 feet or one pipe length. Variation in the invert elevation between adjoining ends of pipe due to non-concentricity of joining surface and/or pipe interior surfaces (in the direction of flow only) shall not exceed one-inch (1") maximum. In addition, the allowable gap "wide joint" from spigot to bell transition shall be 1-inch maximum. Every precaution shall be taken to prevent foreign material from entering the pipe while it is being installed. After placing a length of pipe in the trench, the spigot end shall be centered in the bell and the pipe forced home and brought to correct line and grade. The pipe shall be secured in place with pipe bedding tamped under it. Precaution shall be taken to prevent dirt from entering the joint space. At times when pipe laying is not in progress, the open ends of pipe shall be sealed by a water-tight plug or other means approved by the District. If water is in the trench when work resumes, the plug shall remain in place until the trench is dewatered as specified. Tee branches shall be blocked and sealed with the same joint and pipe material used for pipes. All lines shall be flushed clean of all debris. Water for this purpose may be furnished by the District through a water use permit. All sewer mains shall be a minimum of 8-inches in diameter. Sewer mains shall not be installed under curbs, sidewalks or driveways unless approved by the District. Sewer mains and fittings in areas where the piping is placed on compacted fill shall be


restrained joint as directed by the District. All sewer mains shall have a minimum slope of 0.005 ft/ft. Under unique circumstances, sewer mains greater than 12-inch may be allowed to be installed at a lesser slope. The minimum slope shall meet criteria provided in the Washington Department of Ecology’s ”Criteria for Sewage Works Design”. All sewer main end runs shall be 0.010 ft/ft slope or greater if no further extension is needed or planned. Sewer main slope through easements shall be 0.010 ft/ft unless approved by the District. Slopes greater than 0.20 ft/ft shall be anchored as shown in Division 7 Standard Detail TBR-5.

B. Ductile Iron Pipe: The pipe and fittings shall be inspected for defects before installation. All

lumps, blisters and excess coating shall be removed from the bell and spigot ends of each pipe, the outside of the spigot and the inside of the bell shall be wire-brushed and wiped clean and dry, and be free from oil and grease before the pipe is laid. All pipe coatings shall be checked prior to being laid. All coatings shall be repaired or the pipe replaced as directed by the District. The cutting of pipe for inserting fittings or closure pieces shall be done in a neat and workmanlike manner, without damage to the pipe or coating and so as to leave a smooth end at right angles to the axis of the pipe. Field kit epoxy shall be applied to all cut pipe. Pipe shall be laid with bell ends facing uphill. For connection of mechanical joints, the socket, plain end of each pipe and gasket shall be cleaned of dirt before joining, and shall be joined according to manufacturer's directions. Bolts shall be tightened alternately at top, bottom and sides, so pressure on gasket is even. When metallic pipes are installed in locations of active or abandoned sewer drain fields, the metallic pipe shall be wrapped using American V-Bio Poly Encasement or equal and the pipes bedded and covered with 6” of clean, imported material.

C. PVC Pipe and Fittings, SDR 35 and C-900/905: Care shall be taken to properly align, clean and lubricate the spigot and socket area of the pipe before joining. The pipe spigot shall be forced into the socket until the reference mark on the spigot is flush with the bell end. Forcing the pipes together beyond this point prevents proper contraction and expansion at the joints. The cutting of pipe for inserting fittings or closure pieces shall be done in a neat and workmanlike manner without damage to the pipe. All connections to an existing sewer pipe or different materials from PVC shall be made with sleeves or adapters which are specifically manufactured for this purpose, and shall use elastomeric gasket joints, unless otherwise specifically authorized by the District.

D. HDPE , See Division 6 for pipe installation. Follow specifications for fusing, and reaming when applied to open cut installation.

E. CIPP, See Division 6 for pipe installation.


F. Aggregate, Trenching, Backfill and Restoration: See Division 7.

G. Trench Dams: See Division 7. H. Installation on Steep Slopes: See Division 7 Standard Detail TBR-5. 3-2.040 Lampholes A. Materials

Lampholes shall be the same material as the sewer pipe. For lamphole frame and cover, see Standard Detail S-9. Lamphole frames and covers shall be made from superior quality cast iron. The iron shall be of such character as to make castings that will be tough, strong, sound and of even grain and shall conform to the requirements of ASTM Designation A48, Class 30. Lamphole frames and covers shall be of uniform quality, free from blow holes, porosity, shrinkage, distortion, cavities, cracks or other defects. They shall be smooth and well cleaned and continuously machined to prevent rocking and rattling. Welded or caulked repairs shall not be permitted. Covers shall be easily removable.

B. Installation Install lampholes as shown on the Construction Drawings and in accordance with Division 3 and Standard Detail S-9. Lampholes shall only be installed on sanitary sewer runs less than 200 feet where the main will be a minimum .01 ft/ft (1%), and extended in the future or as directed by the District. Lamphole rings and covers shall be set carefully to the lamphole cover grade in a full bed of cement grout. The lamphole cover elevation shall be set flush with the existing pavement or grade in paved and improved areas. In unimproved areas, lamphole cover elevations shall be set two (2) inches above grade unless otherwise shown on the Construction Drawings to be set higher. Install lamphole marker posts on easements and offsite construction in areas where lampholes are located outside of paved areas. Lamphole marker posts shall be composite fiberglass maker posts as manufactured by Hansen Supply (Green 66 inch Hansen Tri-Flex, TF-66-06) or equal and shall be clearly marked "Sewer". Lampholes located outside of paved areas but which are subject to traffic loads shall be constructed in accordance with Division 3 Standard Detail. S-9.

3-2.050 Sewer Laterals

All sewer laterals shall be a minimum of 6 inches in diameter and be extended to the property line/edge of easement or the dry utilities whichever is furthest. Install a cap with gasket at end point as shown in Division 3 Standard Detail S-10. The depth of each sewer lateral shall be indicated in the field by the Contractor using 2-inch black stenciled numerals on a white 2–inch by 4-inch marker post. In general, the lateral


shall be a minimum depth of 6-feet at the property line. No vertical or horizontal bends shall be allowed in the public right-of-way or sewer easement without specific approval by the District. Side sewers outside the public right-of-way or public easement shall be the responsibility of the property owner to maintain. Measurement from the downstream manhole to each lateral shall be shown on the record drawings See Division 5 for installation of a side sewer outside the public right-of-way or public easement and installation for connecting side sewers to existing laterals.

3-2.060 Precast Concrete Manholes A. Materials

1. Precast manhole components shall conform to the requirements of ASTM Designation C478. All Portland Cement used in the manufacture of the precast sections shall conform to the requirements of ASTM Designation C150, Type II or Type V unless otherwise approved by the District. Standard manhole depth is between 5 feet and 19 feet. Depths less than or greater than the standard depth shall be as approved by the District.

Precast base sections shall conform to the requirements for precast riser section. The base shall be a minimum six (6) inches thick under the pipe invert. Openings for pipes shall be circular, tapered toward the inside of the section, and shall be of the minimum size possible to accommodate the pipe to be inserted and effectively seal the joint.

Standard precast riser sections shall consist of circular sections in standard nominal inside diameter of 48 inches and shall be in accordance with ASTM C478. Minimum height of a riser section shall be one (1) foot. The base sections and risers shall be arranged so no pipes pass through manhole joints. The taper section (cone) shall be eccentric, tapering from 48-inches inside diameter to 24-inches inside diameter. Joining to the riser sections shall be similar to joining between riser sections, but the top surface shall be flat and at least 5-inches wide radially to receive grade rings. Grade rings above the taper section shall be 24-inches inside diameter and 2- or 4- inches high. Grade ring combined height shall be a minimum of 8 inches and shall be a maximum of 20-inches.

2. Manhole frames and covers shall be made from superior quality cast or ductile iron. The

iron shall be of such character as to make castings that shall be tough, strong, sound and of even grain and shall conform to the requirements of ASTM A48, Class 30. Manhole frames and covers shall be of uniform quality, free from blow holes, porosity, shrinkage, distortion, cavities, cracks or other defects. They shall be smooth and well cleaned and continuously machined to prevent rocking and rattling. Welded or caulked


repairs shall not be permitted. Covers shall be easily removable and shall be interchangeable. Frame and cover shall be in accordance to Division 3 Standard Detail S-5. The manufacturer's name shall be cast into and not stamped on an exposed surface.

3. Water tight seals shall be provided in areas where the manhole lid may be inundated with

water or where odor is a concern. Provide and install ¾” strip of Conseal CD-101 manhole ring and cover sealant on the frame immediately under the manhole lid and bolt the lid down.

4. Polypropylene manhole steps shall be made of a copolymer polypropylene superior in its

resistance to corrosiveness, meeting the requirements of ASTM D4101 and shall completely encapsulate a deformed 1/2-inch steel reinforcing rod, conforming to ASTM A615, Grade 60. Steps shall be Lane International Corporation Manhole Step, or equal. Polypropylene steps shall be factory installed in complete accordance with the manufacturer's instructions. This shall be accomplished by pre-drilling two (2) parallel 1-inch holes, 3-3/4-inch deep and 13-inches on center in the cured concrete base, riser and taper sections of the manhole. The insertion ends of the step shall be fully coated with non-shrink epoxy grout then driven into the holes to the prescribed depth. In no case shall the pre-driven hole be allowed to penetrate through the wall of the manhole section.

5. Channels and benches shall be cast using low shrinkage class 3000 concrete with pea gravel or aggregate up to 5/8 inch (max size). Manholes with pre-cast channels conforming to this minimum standard will also be accepted.

6. Drop manhole interior wall shall be coated with Raven 400 lining system or an approved

equal unless approved otherwise by the District, (based on high flows or turbulence). B. Installation

Manhole installation shall be as detailed on the Construction Drawings and in accordance with the Standard Details. Precast sections with damaged joint surfaces, cracks, or damage shall not be installed. Precast base sections shall be set on a prepared bedding material. Before the precast base is set in place, the bedding material shall be carefully leveled to provide full bearing for the entire base section. Precast riser sections and cones shall be set using the specified joint sealant or gasket. Priming and preparation of surfaces and installation of jointing material shall be in strict conformance with the manufacturer's instructions. Grade rings shall be set in a full bed of cement grout. All connections to manholes shall be made with manhole adapters providing a transition from the manhole to pipe material and providing a watertight leak proof seal. All voids around manhole adapters shall be thoroughly grouted and sealed inside and outside of the manhole walls and installed in accordance with manufacturer recommendations. Minimum fall across the channel shall be 0.10-foot. Connections to an existing manhole where a suitable stub does not exist shall be core


drilled and a water tight boot style adapter installed. Manhole frames shall be set carefully to the established surface grade in a full bed of cement grout. The manhole rim elevation shall be set flush with the existing pavement or finished grade in paved and improved areas. Wood shims are not allowed. In unimproved areas, manhole rim elevations shall be set 2- inches above grade unless otherwise shown on the Construction Drawings to be set higher. Install manhole marker posts on easements and offsite construction in areas where manholes are located outside of paved areas. Manhole marker posts shall be fiberglass marker posts as manufactured by Hansen Supply (Green 66 inch Hansen Tri-Flex, TF-66-06) or equal and shall be clearly marked "Sewer". Manholes located outside of paved areas but which are subject to traffic loads shall be set within a 6-foot diameter by 4-inch thick concrete protective pad. The Contractor shall provide paved vehicular access to all manholes, either within the public right-of-way or within easements, except as approved otherwise by the District. For sanitary sewers, the guiding criteria shall be that the upstream and downstream manholes shall be accessible and within 300 feet of an inaccessible manhole to allow for the clearing of blockages within all lines. Manholes set in paved streets or other paved areas shall be adjusted to finished grade after paving and when required, the manhole frame shall be tilted to conform to the slope of the paved surface. Channels shall be given a smooth finish, or equivalent, and channel landings shall be sloped to drain into the channels. Bottom and sides shall be given a trowel finish. Benches shall receive a light broom finish. Unless precast channeled bases are used, notify the District when channeling is scheduled and provide a copy of the concrete mix ticket. Ladders shall be installed in base sections. Steps shall be installed in riser sections and taper sections so that the completed manhole shall have a continuous vertical ladder with equally spaced rungs as shown on the Standard Details. Steps shall be firmly cast or grouted in place. Infiltration around steps shall not be allowed. Manholes shall not be located in curbs and gutter lines or low points. Manholes shall not be located in sidewalks or crosswalks unless otherwise approved by the District. Maximum spacing between manholes is 400 feet. The minimum inside diameter of manholes shall be 48 inches. For incoming pipes larger than 24 inches in diameter, the manhole shall be 54 inches or greater. Manholes with invert elevations greater than or equal to 19 feet below finished grade shall be a minimum 60 inches in diameter. Manholes are mandatory when connecting significant commercial or industrial facilities to the sanitary sewer system and shall be of adequate size to provide for monitoring and sampling equipment.


3-3.000 TESTING A. General

Prior to testing, the Contractor shall flush and thoroughly clean all lines. All dirt, sand and other debris shall be completely removed. In addition to the requirements for testing the sewer pipe, all lines shall be visually free from leakage. If the pipe installation fails to meet these requirements, the Contractor shall determine, at his own expense, the source or sources of leakage and shall repair (if the extent and type of repairs proposed by the Contractor appear reasonable to the District) or replace all defective materials or workmanship. The completed pipe installation shall meet the requirements of the visual test, and shall meet the requirements of the air test or the alternative water exfiltration test before District acceptance. If deemed necessary by the District, the first section of pipe installed, at least 100 feet in length, installed by the each crew, shall be tested, in order to qualify the crew and/or the material. A successful installation of this first section shall be a prerequisite to further pipe installation by the crew. At the Contractor's option, testing may be performed at any time during the construction process after at least two 2 feet of backfill has been placed over the pipe. The District shall require testing after backfilling is complete.

B. Closed Circuit Television Inspection (CCTV)

All videos shall be provided on DVD format. The video camera shall have a swivel head lens capable of turning and rotating 180 degrees to provide inspection of side sewer connections. The camera shall have a 1-inch ball placed immediately in front of the camera mounted such that the ball contacts the pipe bottom at all times. Television inspections shall be conducted following trench backfill; compaction, and cleaning, after all manholes are channeled, and invert elevations, are received, reviewed and accepted by the District. Water shall be poured into the system immediately preceding the television inspection and shall be visible on the DVD recording. The District shall be notified two working days prior to any televised inspection. All lines not clean shall be re-flushed, cleaned and re-videoed. The Contractor shall provide to the District a DVD with a separate written report for each sewer line segment.


C. Air Testing

In areas where other underground utilities will be installed, (power, communications, gas, etc.) that may conflict with the sewer installation, the District shall witness the air test after those utilities are installed. The Contractor may choose to pre-test their lines prior to this. Surveyed, as-constructed inverts shall be submitted to the District and approved prior to scheduling air testing with the District. The pipe installation shall be tested with low pressure air. Air shall be slowly supplied to the plugged pipe installation until the internal air pressure reaches 4.0 pounds per square inch greater than the average back pressure of any ground water that may submerge the pipe. At least two minutes shall be allowed for temperature stabilization before proceeding further. The time interval required for the internal pressure to decrease from 4.0 to 3.0 pounds per square inch must be equal to or greater than the time that is indicated on the following table:

Length of Pipe

(ft)

Length of 6-inch Pipe (ft)

8-inch

12-inch

0

50

100

150

200

250

300

350

400

0 0

0 1:19

1:19 2:39

2:39 3:59

3:59 5:19

5:19 6:39

6:39 7:59

7:59 9:19

9:19 10:39

10:39

50 2:22

5:19 3:42

6:39 5:01

7:59 6:21

9:19 7:41

10:39 9:01

11:59 10:21

13:19 11:41

13:51 11:52

13:35

100 4:44

10:39 6:04

11:59 7:24

13:19 8:43

14:39 10:03

15:59 11:23

16:22 12:29

15:51 12:22

15:27 12:16

15:06

150 7:06

15:59 8:26

17:18 9:00

18:38 11:06

18:53 12:25

18:07 13:00

17:30 12:50

16:59 12:42

16:33 12:35

16:11

200 9:28

21:18 10:48

21:24 12:08

20:23 13:28

19:34 13:29

18:53 13:16

18:18 13:06

17:48 12:57

17:30 12:50

18:16

250 11:50

22:39 13:10

21:38 14:14

20:46 13:56

20:02 13:41

19:25 13:29

19:01 13:19

19:47 13:10

20:33 13:02

21:18

300 14:12

22:39 14:41

21:47 14:21

21:02 14:04

20:33 13:51

21:18 13:39

22:04 13:29

22:50 13:26

23:35 14:12

24:05

350 15:06

22:39 14:44

22:04 14:26

22:50 14:11

23:35 13:58

24:08 13:47

25:06 14:02

25:47 14:48

26:33 15:33

27:10

400 15:06

24:05 14:47

25:06 14:30

25:47 14:16

26:33 14:04

27:10 14:37

28:04 15:23

28:50 16:09

29:36 16:54

30:22

Time in Minutes and Seconds Plugs used to close the sewer pipe for the air test shall be securely braced to prevent the unintentional release of a plug which can become a high velocity projectile. Gauges, air piping manifolds and valves shall be located at the top of the ground. No one shall be permitted to enter a manhole where a plugged pipe is under pressure. Air testing apparatus shall be equipped with a pressure release device such as a rupture disk or a pressure relief valve designed to relieve pressure on the pipe at 6 psi, or as recommended by the manufacturer.


3-4.000 Early Sewer System Access

3-4.010 Existing Buildings

When an existing onsite septic system fails, is damaged, removed, or does not meet

health standards, the Developer may be allowed to connect the existing structure to the

new sewer system at the discretion of the District. At a minimum, the following criteria

must be met:

The newly installed sewer system must be satisfactorily tested as stated in previous sections of this chapter and approved by the District for use

Developer of Record signs the " Early Sewer System Access Agreement"

Manhole castings and lids must be anchored or collared to prevent movement

Developer shall be responsible to remove all plugs and isolation equipment from manholes where sewage will be present

Only the structures approved will be permitted to connect under request

The Owner of the property shall obtain side sewer permit(s) and execute all appropriate forms

All sewer fees and permitting must be paid for

Safety measures for entering confined spaces with sewage discharge shall be followed

3-4.020 Model Home Sewer Permit(s) for Single Family Proposed Recorded Plats

At the sole discretion of the District, a limited number of model homes under construction

may be able to obtain water meters and permitted side sewer connections if the water and

sewer system is complete and able to provide service. The Developer must have the water

and sewer system tested and acceptable to receive or give service in accordance with these

standards and:

Complete the Punchlist except for Plat Recording

Sign the Early Water or Early Sewer Access Agreement

Provide easements over the water and sewer system for the District to hold in a format acceptable to the District, which will be returned to the developer once recording is complete

Provide copies of the building permits issued by the authority

Provide future legal addresses and billing information on the District’s Service Connection Application form.

Provide $5,000 deposit cash or assignment)for each set of Model Home connections approved, to be returned at Use and Operations

Once the above items are submitted and approved;

Purchase both the meter and side sewer permit as a set

Pay all deposits and fees for the meter and side sewer connection


The number of Model Homes allowed to obtain meters and side sewer permits are based on the size of the proposed plat and are limited to: Plat Size by Lots Allowed Connections (up to) 3-9 2 10-25 3 26-50 4 51 & up 5 The District reserves the right to terminate this option, reduce the allowed connections, or lock off and suspend service if the intent of this allowance is not met. Homes may not be sold to or occupied by, permanent residents, nor anyone living in a model home that has been granted temporary service until official acceptance from the District. Daily use is allowed. If occupancy is granted before plat recording, the District must be notified. Tampering or removing District meters is not permitted and doing so could revoke the right to obtain meters. The developer is responsible for their agents, builders, and all onsite personnel in this matter. For other types of single family development, dry side sewer pipe extensions to within eighteen (18) inches of the building may be allowed up to the limit provided in this section following the same criteria, at the discretion of the District.

3-5.000 Bypassing Sewer Flows

When work will affect the existing flow of sewage, the developer/contractor shall provide for the bypassing of all sewage flow.

3-5.010 Bypass Flow Through Plugs

A method for bypassing sewer flow is to use flow through plugs that allow sewer flows to continue during rechanneling of a manhole base. The flow through plugs shall be sized to accommodate existing peak flows and allow solids to pass through. Sewer bypass plugs shall be removed as soon as possible. The Developer/Contractor is responsible for the success of this bypassing work.

3-5.020 Bypass Pumping or Hauling

Another method for bypassing sewer flows is to use bypass pumping and/or hauling sewer flows to a downstream manhole. The minimum criteria for bypass pumping or hauling are listed below. Specific site conditions may require additional activities by the Developer/Contractor to successfully complete the bypassing.


Prepare and submit a sewer bypass system plan to the District for review at least 10 working days prior to start of Work. The bypass plan, at a minimum, shall include bypassing anticipated peak daily flow, a schematic showing the pumps and pump sizing, the pipes and pipe sizing, and power source. Sewage bypassing shall not commence until the District has confirmed the success of the sewage bypass operation.

Pumps shall be non-clog sewage pumps capable of pumping spherical 3-inch solids. The Contractor shall provide at least two pumps, each capable of pumping the peak daily flow. The standby pumps shall be in place ready for operation and connected to power. Bypass pressure pipe shall be in good condition with watertight joints. Bypass pressure pipe shall be 4-inch diameter minimum. Flexible hoses are not permitted. Provide H20 rated ramps over pipe for vehicle access if needed. Higher rated ramps may be required where exposed to commercial traffic.

The Contractor may use electrical generators to power the pumps. However these generators must be equipped with noise suppression features that satisfy the jurisdictional noise ordinance requirements for night and weekend work if necessary. It will be the Contractor’s responsibility to secure a noise variance if required as a result of its operations.

The Contractor shall notify affected property owners at least three business days prior to installing the bypass system. The Contractor shall maintain the sewer bypass system until the Work is complete. The Contractor shall have qualified person(s) on site at all times, dedicated to oversee the operation of the bypass system and monitor manholes for potential back up. After the sewage bypass operation is complete, all sewers subject to surcharging during the bypass operation shall be cleaned.

During any bypass operation, a vactor truck must be onsite during bypass operations and sized to accommodate flows if pump swap is needed.

3-6.000 Abandoning Existing Sewer System

The portions of the sewer system that are replaced or no longer needed as a result of the Work shall be abandoned or removed, as directed by the District or as required by the jurisdictional authority. Whichever requirement is more stringent shall apply.

At a minimum, all manhole sections including the cone or flat top shall be removed to the base and any pipe line that remains in the ground shall be filled with flowable CDF. The manhole sections, any pipe and appurtenances removed shall be properly disposed of by the Developer/Contractor. Where abandoned pipe is connected to a manhole that remains active, a heavy duty mechanical plug shall be inserted into the pipe to be abandoned and the manhole shall be rechanneled in a professional manner to eliminate any infiltration from abandoned piping. Bypassing sewer may be required for rechanneling. See applicable section.

If the jurisdictional authority requires removal, the pipe and manholes shall be disposed of in compliance with authorities and the trench lines restored in accordance with District Standards Division 7 or jurisdictional authority, whichever is more stringent shall apply.


Standards & Guidelines Page 1 of 28 Division 4 - Sewer Lift Stations

DIVISION 4

Standards

for

Lift Stations



Division 4

Standards for Lift Stations

Table of Contents 4-1.000 SEWER LIFT STATIONS ......................................................................................... 4 4-1.010 General .................................................................................................................... 4 4-1.020 Type of Sewer Lift Stations .................................................................................... 5 Type 5 Station Description .................................................................................................................. 5 4-1.030 Type 1 and 2 Lift Stations ...................................................................................... 6

A. Lift Station and Force Main Locations ............................................................................. 6

B. Construction Standards .................................................................................................. 6

C. Hydraulics ...................................................................................................................... 6

D. Station Requirements ..................................................................................................... 7

E. Pumps and Motors ......................................................................................................... 8

F. Manufacturer’s Services ................................................................................................. 9

G. Wet Well and Dry Well ...................................................................................................10

H. Overflow Storage ........................................................................................................... 11

I. Piping ............................................................................................................................ 11

J. Electrical ........................................................................................................................12

K. Electrical Enclosures .....................................................................................................13

L. Auxiliary (Standby) Power System .................................................................................14

M. Generator Set ................................................................................................................16

N. Generator’s Manufacturer’s Services .............................................................................17

O. Transfer Switches ..........................................................................................................17

P. Controls .........................................................................................................................18

Q. Control System Architecture ..........................................................................................19

R. Instrumentation ..............................................................................................................20

S. Lift Station Control Functions .........................................................................................21

T. Wiring ............................................................................................................................23

U. Motor Control .................................................................................................................24

V. Telemetry .......................................................................................................................25

W. Other Equipment ...........................................................................................................25

X. General Site Conditions .................................................................................................26

4-1.040 Type 3 Lift Stations –Individual Grinder Pumps ..................................................27



DETAILS Typical Type 1 Lift Station Layout – Plan…………………………………………..…...……… LS-1 Typical Type 1 Lift Station Layout - Profile………………………………………..…...………. LS-2 Typical Type 1 & 2 Lift Station Bypass - Profile..…………………………………………........ LS-3 Typical Type 2 Lift Station Layout - Plan…………………………………………..…...………. LS-4 Typical Type 2 Lift Station Layout – Profile………………………………………..…...………. LS-5 Vacant………………………..………………………......…………………..…...……….......... LS-6 Type 3 Lift Station……………………………………………………………..…...………........ LS-7 Typical Lift Station One-Line..………………………......…………………..…...……….......... LS-8 Preparing Instrument Cables………………………………………………..…...………........ LS-9



4-1.000 SEWER LIFT STATIONS 4-1.010 General Sanitary sewer lift stations shall only be allowed upon written approval by the District. The Developer shall provide written documentation to support the request for lift station installation. It is intended that the Contractor shall furnish and install a complete, tested, and operational lift station with provisions for backup power and pumping, in accordance with State, District, and Local requirements. Lift stations and their force mains shall be in conformance with the Washington State Department of Ecology (DOE) Criteria for Sewage Works Design (Orange Book), latest edition, for sewage pump stations. The station shall meet requirement of Class I Reliability, as defined by Ecology. Sanitary sewer lift stations shall meet the more stringent noise requirements of either Snohomish County Code (SCC) or the local noise ordinance for the municipality in which the station is located. Sanitary sewer lift stations shall be in compliance with all applicable odor ordinances and codes, including applicable municipal codes, the Snohomish County Code, and regulations enforced by the Puget Sound Clean Air Agency. Sanitary sewer lift stations shall comply with Snohomish County’s seismic ordinance. The District may require a lift station to be sized to accommodate flows or hookups in addition to those identified for a specific development/project. The District will include the number of hookups and the lift station type in the Developer Extension Agreement. Prior to final acceptance for Type 1 and 2 lift stations, as defined below, the Developer shall provide the following items:

A reproducible set of as-built drawings showing final location of all equipment, conduit, and wiring, and vertical and horizontal locations of all pipe and pipe inlets and appurtenances.

Manufacturer's equipment warranties on all equipment. Warranty periods to be approved by the District prior to acceptance of warranties.

A completed new asset information electronic spreadsheet on a format provided by the District. This spreadsheet includes equipment data and other information.

Deed to the District the applicable recorded tract of land or easements encompassing station and force main.

Four (4) complete sets and one searchable electronic copy, on a Digital Versatile Disc (DVD) of the operation and maintenance manuals.



The District has established a naming convention for equipment numbering, conduit numbering and wire labeling that shall be used for Type 1 and 2 lift stations. The Developer shall request and obtain the Districts a current version of the memorandum “Numbering System for all Non-GIS based Assets” prior to design. All wire labeling and required nameplates shall be installed prior to startup & testing of the lift station. 4-1.020 Type of Sewer Lift Stations The three types of factory built lift stations or pumping facilities available under these standards are: A. Type 1: Wet well/dry well station

The lift station shall consist of a separated wet well and dry well as described in the DOE Orange Book. The factory built dry well shall consist of an access tube and below grade pump room. The station shall accommodate a minimum of two pumps. Pumps shall be Cornell pumps designed for pumping raw sewage and capable of passing a minimum 3-inch spherical solid. Pump speed shall be a maximum of 1800 rpm and a minimum of 1200 rpm when available.

Acceptable manufacturers include Dakota Pump Incorporated and USEMCO Inc for the factory built dry well. All other manufacturers, pumps, or configurations will require approval by the District.

B. Type 2: Wet well submersible pumps and motors station

The sewage lift station shall use Flygt submersible pumps or equivalent. Pumps shall be designed for pumping raw sewage and capable of passing a minimum 3-inch spherical solid, or have a Flygt N-impeller. Pump speed shall be a maximum of 1800 rpm and a minimum of 1200 rpm when available. The pump control panel, and liquid level control shall be installed within an above grade NEMA 4X enclosure approved by the District.

C. Type 3: Individual grinder pumps

The sewage lift station shall be Environment One Model DH071 or DR071 grinder pump with Sentry PreSTAT controls.

The three types of lift stations are limited to the following applications and the type shall be selected by and approved by the District.

Type Station Description Application/Number of Equivalent

Residential Units to be Served

Minimum Flow Rate

1 Wet well-dry well 51 and greater 125 gpm

2 Wet well submersible pumps and motors

Up to 50 125 gpm

3 Individual Grinder pumps Single residence/unit No minimum



4-1.030 Type 1 and 2 Lift Stations

A. Lift Station and Force Main Locations Lift stations and force mains shall be located well out of the buffers for sensitive areas as

defined by the local land use jurisdiction. If this requirement cannot be met, additional conditions shall be added by the District to protect and assure adequate environmental protection for the station and adjacent areas.

A geotechnical report stamped by a licensed geotechnical engineer shall be provided for the

area proposed for the lift station. The geotechnical report shall include a discussion of seismic faults and conditions, groundwater conditions, sensitive slopes, wetlands, and other geotechnical issues.

Sufficient land shall be provided to the District for the station for ingress and egress of

District equipment for maintenance and operation of the station including, fencing for the site. The land area shall be approved by the District prior to construction approval.

B. Construction Standards All materials, installation, and workmanship shall be in accordance with District Standards

and the latest edition of the State of Washington Standard Specifications for Road, Bridge, and Municipal Construction (Standard Specifications).

In addition, the lift station standards, materials and installation shall comply with the manufacturer’s Engineering Data and specifications for pump stations as prepared and provided by the lift station manufacturer.

The first manhole upstream of the wet well shall have an eighteen inch deep sump below the lowest pipe invert. This manhole shall be located so that it is accessible for regular cleaning of the manhole by a sewer vacuum truck. The interior shall be coated with Raven 400 lining systems, or an approved equal, and exterior coated with Karnak #83AF fibered damp proofing asphalt compound or an approved equal.

The manhole in which the force main will discharge into shall be fully coated inside and out

with the same products as noted in previous paragraph.

C. Hydraulics

The peak design flow shall be determined as recommended in the latest revision of the DOE’s Criteria for Sewage Works Design (Orange Book). This analysis shall be compared with the most recent planning information available from District. The lift station capacity shall be the peak hour flow rate with its largest pump offline (firm

capacity, as defined by the DOE).



Pump selection and force main size shall ensure a minimum velocity of 3 feet per second in

the force main. Force main velocities shall not exceed 8 feet per second.

Hydraulic and pump design shall conform to the Orange Book and the latest revision of the

Hydraulic Institute Standards. The Developer shall submit a lift station and force main pressure surge analysis (water

hammer) to the District as recommended in the Orange Book in a format acceptable to the District. The analysis shall incorporate calculations for minimum and maximum pressures in the system for the anticipated worst case scenario, including pump starts and sudden power outage shutdowns. Surge protection shall be installed as required by the surge analysis and approved by the District. If required, surge protection could include devices such as: pump control valves, variable frequency drives, use of high strength piping, and vacuum relief valves (swing check type). Critical surge protection devices shall protect the system under all operation conditions, including a power outage shutdown while the station is operating at its highest allowed capacity. Hydro pneumatic tanks shall not be used for surge control.

If vacuum relief valves are used, a total number of two valves shall be installed in a vault for redundancy and maintenance purposes. Vaults shall be drained to the nearest gravity sewer, side sewer lateral, unless the District determines another means is acceptable. Vault floors shall be sloped to the drain. Vaults shall meet all requirements of this Division 4 and those applicable from Divisions 2 and 3.

All hydraulic calculations, including the pressure surge analysis, shall be signed and

stamped by a Professional Engineer licensed in the State of Washington and shall be provided to the District in a station design report.

D. Station Requirements For the Type 1 wet well/dry well lift station, the below grade dry well shall be completely factory built, unless otherwise approved by the District. The drywell shall have an above ground entrance with lockable hatch (typically 1.5 feet above grade) made of steel or fiberglass, as approved by the District. The wet well for Type 1 and Type 2 shall have an at grade, lockable, flat lid with H20 or H30 (pending location in station and or as directed) rated 36”x72” LW products HD Access hatch or approved equal

. Both Type 1 and 2 lift station construction shall be in compliance with the Occupational

Safety & Health Act (OSHA), Underwriters Laboratory (UL), American Society for Testing and Materials (ASTM), National Electrical Code (NEC) and other applicable codes and regulations. Sewage lift stations shall be provided with the following options in addition to those described in the instrumentation and pump control sections of this document:

Running time meters

Intrinsically safe displacement switch relays

Pump failure alarm relays

Phase fail relays

Pump running lights



Ultrasonic level sensors (bubblers or other level sensors are not acceptable)

Level indicators

Operator in trouble button

Check valve position sensor

Amp meters

Hand-Off-Auto (H/O/A) switch

Motor disconnect located in the drywell or within sight of the motor

The following spare parts shall be provided to the District: Type 1 & 2 lift stations:

Mechanical seal

2 Impellers (1-right and 1-left)

Impeller wear rings, if applicable

Impeller shaft

Bearings

Set of gaskets and O-ring seals

Set of keys, dowels, pins. Etc.

Set of shaft sleeves

Check valve re-build kit

Any special tools required to dismantle pump

Spare motor

Type 2 lift station shall also include: one spare pump

E. Pumps and Motors

A minimum of two sewage pumps are required for both Type 1 and 2 lift stations. Each pump shall be designed to handle raw, unscreened, sanitary sewage. The pumps shall have sufficient capacity and capability to efficiently handle the peak design flow, including infiltration and inflow requirements, as determined by the District, with the largest pump out of service. Design calculations and pump curves indicating the same shall be provided with the submittal information.

The pump and motor shafts shall be the maximum diameter available for these units. For Type 1 and 2 lift stations, pump motors shall be standard 480 Volt, 3-phase, 60-cycle, N.E.M.A. Standards, starting Code “G” or better. Motors shall be premium efficiency and have a 1.15 service factor. Motors controlled by a variable frequency drive (VFD) shall be rated for inverter duty and must include a stainless steel nameplate showing “Inverter Duty Motor.” Contractor shall supply certification with submittals that the motors meet all requirements of NEMA MG1-2004, Part 31. Type 2 lift station pumps shall be submersible dual slide rail type and have the pumps and mechanical slide rail accessories installed in the wet well. Slide rail and accessories shall be a type 316 stainless steel. A hoisting bail shall provide for proper balance of pump and removal from the discharge connection while using a single lift cable. Lifting cable shall consist of a type 316 stainless steel braided wire cable attached to the pump lifting bail. A crimped ball end shall be provided at the upper end of this cable for attaching to the wet well



access frame.

All external surfaces of the Type 2 lift station submersible pumps coming into contact with sewage shall be protected by an epoxy coating of 8 mils minimum thickness. All exposed fasteners and lock washers shall be of type 316 stainless steel.

The Type 2 lift station casing shall be easily removable from the motor for full inspection of impeller. The pump(s) shall be heavy duty, electric submersible, centrifugal non-clog or chopper type units designed for handling raw, unscreened sewage and wastewater and shall be fully guaranteed for this use. Non-clog impellers shall pass a 3-inch minimum spherical solid or greater. The Flygt N impeller can be provided as an alternative to providing a 3-icnh solid passing capability. The pumps provided shall be capable of operating in an ambient liquid temperature of 104 degrees F. Since the high temperature of 104 degrees F is specified by the National Electrical Manufacturers Association (NEMA) and Factory Mutual (FM), motors with a maximum ambient temperature rating below 104 degrees F shall not be acceptable. The Type 1 lift station pump and motor unit shall be suitable for continuous operation in the dry well environment.

The Type 2 lift station pump and motor unit shall be suitable for continuous operation at full nameplate load while the motor is completely submerged, partially submerged or totally non-submerged. The use of shower systems, secondary pumps or cooling fans to cool the motor shall not be acceptable. The pump, mechanical seals and motor units provided under this specification shall be from the same manufacturer in order to achieve standardization of operation, maintenance, spare parts, manufacturer's service and warranty.

For Type 1 and Type 2 lift stations, thermal protection shall consist of three separate thermostatic switches embedded into the stator windings. Each switch shall open independently and terminate motor operation if temperature of the protected winding reaches the high temperature set point. For Type 2 lift stations, any moisture in the motor housing shall be detected by a mechanically activated moisture sensing micro-switch. The switch shall be sensitive enough to detect airborne moisture and terminate operation of motor before liquid enters the cavity. Use of probes or floats that rely on the presence of liquid to initiate signal is acceptable The thermal and moisture sensing devices shall be connected to the pump control panel by the Contractor. The motor and pump shall be connected to form an integral unit.

F. Manufacturer’s Services

The sewage lift station supplier shall check the station during installation and startup to determine if the installation is correct. The District shall be present at each check by the supplier. Written confirmation and recommendations from each visit shall be provided to the District within one week of the visit. The sewage lift station supplier shall provide 4 hours of training for District personnel at the



lift stations site during startup. The District reserves the right to video tape the training session. The sewage lift station supplier shall provide four complete bound paper copies and one complete searchable electronic copy on a Digital Versatile Disc (DVD) of maintenance and operation materials to the District. These manuals shall be complete and shall include all information necessary to allow District personnel to maintain the lift station.

G. Wet Well and Dry Well

Lift station wet wells shall be sized to provide adequate hydraulic inlet conditions for the pumps. Wet wells shall be a minimum 96 inch inside diameter precast concrete manhole. Provide access platform and ladder if so directed by District. All other wet well configurations will require District approval. The Type 2 lift station shall use a factory built base. The lid shall be sized for the installation and removal of the specified pumps, and shall be of sufficient size to permit access to the wet well. The base shall be sized to accommodate an H20 or H30 (pending location in station and or as directed) rated 36”x72” LW Products HD Access hatch or approved equal. For pump removal, a Type 2 lift station shall be furnished with a flush-mounted pedestal/socket base cast into concrete or as approved and shall be compatible the Districts portable hoist, refer to Section X.” General Site Conditions” for make and model. If pumps are heavier than what the District’s portable hoist equipment can facilitate, the contractor shall provide a portable hoist and socket as part of the station and shall not weigh more than 75 pounds.

Type 1 and 2 lift stations wet wells shall:

Provide a hopper style wet well bottom with a minimum of 60% slope at the base of the wet well as recommended by Washington State Department of Ecology.

The wet well shall be sized to provide a minimum of 15 minutes between pump cycles at half of peak pump design capacity, unless approved otherwise by the District and pumps are operated by variable frequency drives. The high water alarm shall be set a minimum of 7 inches below the invert of the lowest gravity sewer inlet pipe. High water alarm shall be set at a level below the lid to allow for temporary storage of six hours anticipated average daily design flow unless otherwise directed by the District.

Provide buoyancy calculations of all structure that extend below ground surface to the District and include any protection needed to prevent buoyancy. Calculations shall be stamped and signed by a Professional Engineer licensed in the State of Washington.

The wet well chamber shall be provided with a fiberglass ladder secured to the wall with stainless steel hardware and a light fixture rated for Class 1, Division 1 Environment. The wet well light shall be switch controlled with a manual switch located in the electrical enclosure or as directed. Pipe hangers located inside the wet well shall be stainless steel. All nuts, bolts, washers, fasteners etc. shall be stainless steel. All stainless steel shall be grade 316 or better. Depending on station flows, the District may require a stainless steel



baffle installed on the inlet pipe. The interiors of wet wells and dry wells shall have a corrosion resistant lining appropriate for

protection against hydrogen sulfide corrosion. Concrete surfaces in the wet well shall be sealed with Raven 400 lining systems or approved equal. Linings shall be installed per manufacturer’s recommendations. All non stainless steel metals, such as process pipe and conduits, within the wet well shall be coated with a minimum of 16 mils of high performance epoxy.

Dry Well floors shall be slopped towards floor drain or sump, no ponding will be allowed. The exteriors shall be coated with Karnak #83AF fibered damp proofing asphalt compound

or an approved equal and shall be applied per manufacturer’s recommendations. Wet wells shall be provided with a candy cane style vent with a pest screen. Vent to be sized accordingly to accommodate air displacement due to changes in the liquid level in the wells. Vent shall be piped from the well near the top of the lid. Vent and screen shall be coated with or constructed of non corrosive materials or as approved by the District.

H. Overflow Storage

Overflow storage shall be provided for Type 1 and 2 lift stations. The overflow storage volume shall provide for a minimum of 1 hour of storage for peak flow conditions as a recommended minimum per the Washington State Department of Ecology Criteria for Sewage Works Design. The District may require a storage volume greater than the minimum based upon lift station capacity, distance from the District’s Maintenance Facility, proximity to sensitive areas and other factors. When designing the overflow storage facility, the design engineer shall take into consideration the District’s conditional surcharge criteria regarding impacts to the system upstream of the station and allowable surcharge. Conditional surcharge criteria:

If a pipe invert is less than or equal to 10 feet below the ground surface, the maximum allowable surcharge is 1 foot above the pipe crown.

If a pipe invert is greater than 10 feet below the ground surface, the maximum allowable surcharge is 3 feet above the crown

The overflow storage vault (tank or pipe) shall be concrete or as approved by the District. The overflow storage vault floor shall be sloped at a minimum of 2% to drain to the wet well. The overflow storage shall be provided with a H20 rated, minimum 36-inch square LW Products access hatch or equal at the upstream end of the vault and a minimum 24-inch diameter access opening, manhole frame and cover, at the vault discharge point toward the wetwell. All interior concrete surfaces of the storage vault (including end pieces riser sections) shall be coated as required for the wet well and upstream manhole.

I. Piping

All piping materials shall be per Division 3, Sewer Installation. The suction lines from the Type 1 lift station wet well to the dry well shall be a single length



of Ductile Iron pipe. The force main shall be Ductile Iron or HDPE piping and provided with a continual positive slope to the discharge location. There shall be no intermediate high point between the pump station and the force main discharge point (depth shall be a minimum of 4 feet) unless approved otherwise by the District. If an intermediate high point cannot be eliminated through design and is approved by the District, an appropriately sized pressure sewer air release valve shall be submitted for District approval. The pressure sewer air release valve may be required to be equipped with odor control and shall be installed in a vault or other District approved enclosure. Orifices of air release valves shall be sized to eliminate damaging pressure surges (waterhammer) when evacuating air from the force main. Force mains shall be installed and tested in accordance with pressure testing of water mains under Division 2, Water Installation. All pipes (gravity and pressure) entering and leaving the wet well shall have a minimum of two flexible couplings within 18 inches and 36 inches of the structure. The geotechnical report may recommend additional requirements specific to the site. The pipe between the overflow storage vault and the wetwell shall conform to the requirements of Division 3, Sewer Installation.

J. Electrical

The electrical service, controls, auxiliary generator and telemetry shall be furnished and installed in accordance with the applicable federal, state and local codes and standards including:

National Electrical Safety Code (NESC)

National Electrical Manufactures Association (NEMA)

Insulated Power Conductor Engineering Association (IPCEA)

American National Standards Institute (ANSI)

Institute of Electrical & Electronic Engineers (IEEE)

National Fire Protection Association (NFPA)

The Contractor shall coordinate and obtain power service from Snohomish County Public Utility District (PUD) as required to meet the electrical requirements of the lift station and appurtenances. All electrical service installations shall be approved by the land use agency having jurisdiction and Snohomish County PUD and shall be in conformance with the NEC (current version), UL 98, OSHA, and city, county and state electrical codes. District shall be provided with a certificate of final inspection by the appropriate building official. All materials shall be suitable for the environmental conditions including classified hazardous areas as defined in NFPA 820. All wire shall be copper and labeled per Section T. “Wiring”. All conduits shall be labeled where entering or leaving ground surface, manholes,



handholds, pull boxes, and at each end of the conduit. The District has established a naming convention for equipment numbering, conduit numbering and wire labeling that shall be used. The Developer shall request and obtain the Districts a current version of the memorandum “Numbering System for all Non-GIS based Assets” prior to design.

Conduit shall be as follows:

Outside or exposed: PVC coated galvanized rigid steel (GRS) (PRS)

In wet well: PVC coated GRS (PRS)

Underground: Schedule 40 PVC (PVC 40) or PRS

Embedded in concrete: PVC 40 or PRS

Transition Between Grade (Conduit Stubs): PVC coated GRS (PRS)

All underground conduits shall have a minimum of 24 inches of cover and shall be marked with polyethylene tape placed 6 to 12 inches below finished grade and directly above the conduit.

K. Electrical Enclosures The District allows two options for electrical enclosures depending upon type of lift station. The enclosure shall be specified by the District at the time of approval of the lift station. The electrical enclosure options are: Type 1 Station Provide 24 gauge metal roofing on a covered rack mounted utility electrical service entrance and equipment using a minimum of 4” square galvanized HSS posts and 2” X 4” galvanized HSS cross for electrical equipment. NEMA 4X stainless steel electrical enclosures shall be used. The roofing on all enclosures shall overhang on all sides far enough to cover the open door of the control panel and so that the water does not hit the personnel working on the control panel. The concrete slab shall be the same dimensions as the roof. Enclosures for a Type 1 Station include these listed attributes:

The main circuit breaker in NEMA 4X Stainless enclosure

Automatic transfer switch in NEMA 4X Stainless enclosure

Generator Load Bank Test Disconnect switch in NEMA 4X

Generator Load Bank Test Receptacle shall be NEMA 4:high impact strength copper-free aluminum

Pump control and telemetry panel (RTU) in NEMA 4X stainless steel enclosure

Minimum mini power center NEMA 4X Stainless(MPC = 480V CB, 15 KVA transformer, 120/240V CB panel) or equivalent

All Disconnects NEMA 4X

HOA/Junction Panel NEMA 4X

Manual Transfer Switch NEMA 4X

Auxiliary Generator Plug shall be NEMA 4:high impact strength copper-free aluminum



Motor Control Center NEMA 4X

Lights shall be LED where applicable

120V GFI receptacle

Communications interface with telemetry communication interface as required.

Any other power or control components required for a complete and operational system

Ground rods and conductor where used, shall have connections to rods accessible

An externally mounted air conditioner, if necessary

The utility power meter base and if required, leading disconnect, shall be mounted on the outside of the electrical enclosure. The concrete pad shall provide for at least 3-feet of standing space in front of any enclosure access door. At least one spare 2-inch conduit shall be stubbed out beyond the pad.

Type 2 Station

Provide 24 gauge metal roofing on a covered rack mounted utility electrical service entrance and equipment using two 6” I.D. schedule 40 galvanized conduit columns with 16 gauge stainless steel unistrut mounted between for electrical equipment. NEMA 4X stainless steel electrical enclosures shall be used. The roof shall overhang on all sides far enough to cover the open door of the control panel and so that the water does not hit the personnel working on the control panel. The concrete slab shall be the same dimensions as the roof. Enclosures for a Type 2 Station include these listed attributes:

The main circuit breaker in NEMA 4X enclosure

Automatic transfer switch in NEMA 4X enclosure

Generator Load Bank Test Disconnect switch in NEMA 4X

Generator Load Bank Test Receptacle shall be NEMA 4:high impact strength copper-free aluminum

Pump control and telemetry panel (RTU) in NEMA 4X stainless steel enclosure

Minimum mini power center (MPC = 480V CB, 15 KVA transformer, 120/240V CB panel) or equivalent

Lights shall be LED where applicable

120V GFI receptacle

Any other power or control components required for a complete and operational system

Ground rods and conductor where used, shall have connections to rods accessible

An externally mounted air conditioner, if necessary

The utility power meter base and if required leading disconnect shall be mounted on the utility electrical service entrance rack. The concrete pad shall provide for at least 3-feet of standing space in front of any enclosure access door. At least one spare 2-inch and 1-inch conduit shall be stubbed out 1-foot beyond the pad.

L. Auxiliary (Standby) Power System



Standby power generation equipment shall be provided which will operate the pump station in the event of a power outage. The auxiliary diesel engine generator shall be manufactured by one of the following acceptable manufacturers: Cummins-Onan, Kohler, or Caterpillar. Provide a sound attenuating, weatherproof enclosure, such as Quiet Site II type or better enclosure, to achieve noise levels specified by the most stringent governing local noise ordinance. Specified noise levels vary by land use and if equipment is used for emergency purposes. The enclosure shall include but not be limited to the following features:

Provide an internal, 120VAC LED style luminaire above each access door. The luminaires shall be controlled by access door switches such that when any access door is open all the access door luminaires shall be energized. The luminaires shall be powered from a single external 20A, 120VAC supply circuit. The luminaires shall be sized and located to provide sufficient light for operation, inspection, and maintenance activities.

Each access door shall be equipped with an Intrusion switch which provides a series connected signal to the SCADA system. The intrusion switches shall be normally open, held closed.

All hardware and hinges shall be stainless steel. The auxiliary power unit shall be complete in every respect and shall include but not be limited to the following:

Generator, control panel, and circuit breaker.

Engine, radiator, and exhaust system.

Generator set noise and weather enclosure.

Automatic transfer switch to be installed in the electrical enclosure by the enclosure manufacturer.

Battery and rack.

Battery charger with remote status indication.

Coolant heater.

Conduit, wire, and piping.

Fuel storage with a 4-20mA level transducer, non mechanical direct contact level transducer such as Intempco LTX20 or equal.

Digital Communication and or modules compatible for complete communications to PLC. o Generator control panel and ATS shall be programmable and have digital

connectivity to SCADA RTU/PLC (refer to Sections M & O respectively).

Provide a minimum of 24 hours of onsite fuel storage tank at full load. Sub-base fuel tanks shall not exceed 3-feet in height. If separate fuel tank is needed, fuel piping shall be located below grade. Piping shall conform to appropriate standards including double containment and leak detection. Fuel tank shall be equipped with a low fuel-level alarm. The fuel tank and fuel piping shall comply with all local requirements, including International Fire Code (IFC) Chapter 34, NFPA 30 and NFPA 37.

The fuel system shall be provided with an electrical shutoff valve with flexible connection to the generator. The generator set shall be built in compliance with the following codes, regulations, and standards: NEMA, IEE, ANSI, NEC, and OSHA.



Provide a fuel tank heating system. System shall consist of a silicone rubber heating pad controlled by a thermostat. Heating pad shall be affixed to the top of the diesel fuel tank, inside of the sound attenuating, weather proof enclosure. Thermostat shall be installed interior to the enclosure, adjustable and initially set to activate the heating pad at temperatures below 40 degrees Fahrenheit. Device shall be on a dedicated circuit. Heating pad shall be “BriskHeat SRL series Silicone Rubber Heating Blanket” or approved equal and sized to maintain fuel in diesel tank above 32 degrees Fahrenheit when external temperatures are 15 degrees Fahrenheit. Thermostat shall be adjustable from -30 to 212 degrees F and located in a surface mounted NEMA 4X enclosure. Common alarms, ATS position status, alerts and fuel level shall be connected to the telemetry system as directed by the District.

M. Generator Set

The generator set shall be capable of automatic starting and maintaining a full load from a cold start. The generator set is to be equipped with the following features:

Full circulation, pressure-type lubrication with replaceable filter with bypass.

Gear-type, mechanical engine governor.

Replaceable-type engine air filter.

Engine oil drain extension with ball valve and plug.

Radiator cooled by engine-mounted radiator system.

Revolving field, dynamically balanced, static excited, static regulated 12-lead.

Radio suppression.

Self-ventilated, drip-proof construction.

Brushless, fast response, amortized winding, Class “B” and “H” fungus resistant.

Coils and stator mechanically secured and epoxy dipped.

Contact for an alarm and report system (6 contacts) N.O./N.C.

Line circuit breaker rated at full generator capacity.

Current transformers.

Frequency meter.

Panel light.

Generator load meter (to measure true load on generator) in kW. The generator manufacturer’s standard digital controls shall be an acceptable substitute while meeting all of the specified functions.

Switches on all cabinet doors wired in a Normally Open held close configuration.

Digital communication connected to the PLC outlined in Section Q. “Control System Architecture”.

o Generator control panel shall be programmable and have digital connectivity to SCADA RTU/PLC . Integration of data includes but not limited to; generator, hour meters, and maintenance & equipment data.

Provide necessary software and cables to maintain & troubleshoot the Generator Set.

The generator set shall meet the following performance requirements:

Performance of the generator set shall be based on operation of the assembly with fan, battery charging alternator and all specified and required appurtenances.



The generator set shall be rated for continuous standby service, however the temperature rise of the generator shall not exceed 105 degree C above a 40 degree C ambient, when producing full rated load for a continuous period of time.

Voltage Drop: The engine generator unit supplied shall start the indicated load with a sustained RMS voltage drop no greater than 20% of rated phase to phase voltage during the starting period. The starting period shall be from zero up to 3 seconds. The instantaneous voltage dip may be greater than 20% but shall not cause motor starter chatter or relay dropout or exceed a level which causes undesirable motor starting. If motor starting problems are encountered, the size of the generator set shall be increased as required to reduce voltage dip until the motors can be started without problems. The method of measurement shall be by light beam oscilloscope.

Frequency regulation shall be plus or minus 3 hertz maximum, not load to rated load.

Voltage regulation shall be plus or minus 2% maximum.

The generator set shall be capable of starting and operating the following load without exceeding the temperature ratings of the engine or the generator. Connected base load consisting of one lead motor and miscellaneous loads totaling an additional 17 kVA. Start an additional lag motor.

The generator set shall be sized by the manufacturer to start and operate the load indicated herein (all electrical equipment on and all pumps running simultaneously and continuously) while meeting the performance requirements set forth herein. The minimum acceptable engine generator set shall be capable of producing at least the kilowatt rating shown here at 0.8 power factor, continuously. If the generator supplies power to variable frequency drives (VFD) then the generator set shall be compatible with the VFD’s specified for the project. The Contractor shall submit a certification letter which verifies that the generator set is compatible with the specified VFDs.

N. Generator’s Manufacturer’s Services

The generator supplier shall check the generator installation and startup to determine if the installation is correct. The District shall be present at each check by the supplier. Written confirmation and recommendations from the visit shall be provided to the District within one week of the visit. The generator supplier shall provide all tools for the generator set as recommended and required by the manufacturer. The generator supplier shall provide 4 hours of training for District personnel at the lift station site during startup. The District reserves the right to video tape the training session.

The generator supplier shall provide four complete bound paper copies and one complete electronic copy on a Digital Versatile Disc (DVD) of maintenance and operation materials to the District. These manuals shall be complete and shall include all information necessary to allow District personnel to maintain the generator.

O. Transfer Switches

The transfer switch shall be sized, in amps, to equal the full connected load of the lift station generator and auxiliary equipment plus 25 percent. The transfer switch shall be enclosed in a NEMA-4X cabinet for installation in the electrical enclosure. Transfer switch shall be manufactured by the same manufacturer as the generator. The transfer switch shall be an automatic-transfer switch compatible to the selected generator and meeting the following



specifications:

The transfer switch shall be equipped with three poles for normal and emergency service of 480 volts, 60 hertz, 3 phase power. The transfer switch shall be mechanically and electrically held and rated to 600 volts for all classes of load and continuous inductive duty.

The transfer switch shall conform to UL 1008 Revision 4 provisions for Withstand Current Ratings and Closing Ratings. The calculated fault current available is 20,000 amperes RMS symmetrical.

The switch shall be capable of enduring 6000 cycles of complete opening and closing at the rated current and voltage at a rate of 6 cycles per minute without failure.

The switch shall be double throw inherently interlocked mechanically and electrically to prevent supplying the load for both sources simultaneously. The operating current shall be obtained from the source to which the load is to be transferred. The transfer mechanism shall be of the double break design and solid silver cadmium surface contacts and individual heat resistant arc chambers.

All contact coils, etc. shall be readily accessible for replacement from front of panel without major disassembly of associated parts.

Transfer switch shall be manufactured by the same company as the generator.

Provide ATS system status signals to the PLC system to monitor ATS on utility/S1, ATS on emergency power/S2 and other system signals as directed by the District.

Provide remote telemetry starting function connectivity.

Provide a prior to retransfer notification via dry contact.

The switch shall provide a “double lug” on the generator side of the switch for connection to an additional disconnect for load testing.

Generator Load Bank Test Disconnect switch shall be wired with equivalent sized generator conductors. Digital readout on front cover for voltage and connected load.

Digital communication connected to PLC as outline in Section Q. “Control System Architecture”.

o ATS shall be programmable and have digital connectivity to SCADA RTU/PLC . Integration of data includes but not limited to; power data, switch position and equipment data.

The Manual Transfer Switch shall be rated for the load served and be the ESL Power Systems Tripleswitch 3-way Manual Transfer Switch or approved equal.

Provide a mobile generator receptacle and manual transfer switch for the ability to use a mobile generator at the lift station located downstream of the automatic transfer switch. Plug shall be manufactured by Crouse Hinds, Model APR 100 AR or Model APR 200 AR or an approved equal

P. Controls

Control and instrument system plans shall be thoroughly and completely depicted in the station design. The plans, in conjunction with the specifications, shall define the type of control system, the type of components in the system, set points, and the interface between the instrumentation and control system and the lift station. To accomplish this, the control and instrument plan(s) should include at a minimum the following:

Control and instrumentation system legend and general notes;



Control, instrumentation, and distribution diagram;

Plans showing location of all control, instrument, and distribution system equipment and components, both electrical and pneumatic; and

Equipment and installation details.

All electrical components, terminals, wires, and enclosures provided with the control system shall be UL recognized or UL listed.

All control panels shall conform to UL508A Part 1-General Use Industrial Control Panels and Section T. “Wiring”, and shall bear a UL label certifying the control panel as a “Listed Enclosed Industrial Control Panel”. The control panels shall be fabricated at the factory. No fabrication other than correction of minor defects or minor transit damage shall be permitted onsite. UL508A Part 2-“Specific Use Industrial Control Panel Types” is not applicable to sanitary sewer lift stations. The lift station controls shall be designed for operation on emergency generator power and capable of load management and include enhanced telemetry as required. The programmable logic controller (PLC), instrumentation and telemetry shall be backed up by a DC uninterruptible power supply (UPS) capable of a minimum 2 hours of operation unless otherwise approved by the District. Equipment for the power supply and UPS shall be the following or approved by the District:

Power supply: Sola HD SDN-P and AB 1606-XLP

UPS: Sola HD SDU and AB 1606-XLS A complete set of spare fuses shall be provided for all fused equipment.

Q. Control System Architecture

All lift station pump control and telemetry functions shall be provided by a programmable logic controller (PLC). The PLC system shall be installed within a NEMA 4X enclosure (remote telemetry unit/RTU). The RTU enclosure shall be designed to contain all of the equipment required to support the operation of the PLC system and the wiring interfaces between the PLC and the pump station electrical equipment. The RTU shall include climate controls with a minimum of a heater and dehumidifier. The local operator interface shall be installed through a full sized inner front door of the RTU enclosure. The RTU shall be designed and constructed to match the District standard. The standard RTU design is available from the District. A Confidentiality and Non-disclosure Agreement must be executed with the District prior to receiving software from the District. Specific PLC components shall be selected from the list below or as approved by the District. All PLC equipment shall be products of Rockwell Automation (Allen-Bradley) Compact Logix Series. No substitutions are allowed, however based on new technology products are subject to change by the District.



Device Description Model No.

CPU PLC Central Processing Unit, W 2.0MB Memory, with 1GB SD card

1769-L33ER

PS Power Supply 1769-PB2

AI Analog Input Module Hart compatible equivalent 1769-IF8

AO Analog Output Module 1769-OF4CI

DI Discrete Input Module 1769-IQ16 or 1769-IQ32

DO Discrete Output Module 1769-OW8I

LOI Local Operator Interface Panelview Plus 700 Ethernet #2711P-B7C4D8

Legacy Serial Port Adapter Card

AB DF1 Interfacing Option MVI69-DFCM or Equivalent in Chassis Options at District Approval

R. Instrumentation

A Toshiba LF654 (or as approved by the District) magnetic flow meter shall be installed on the force main discharge piping and located within a vault. Ground rings shall be installed on both sides of the flow meter. The flow meter transmitter shall be a Toshiba LD622,(or as approved by the District) capable of sending a 4-20 mAmp signal to the telemetry system and Hart compatible. The flow meter shall be capable of sending a totalized pulse to the District’s telemetry system. The meter shall include all required valves so that the meter can be bypassed for maintenance or replacement without affecting the operation of the lift station. Flow meter vault shall be equipped with a light, intrusion switches, flood switches, and with an h20 or H30 rated 36”X72”LW Products HD Access hatch or approved equal access hatch. The vault floor shall slope to a floor drain with an elastomer trap guard. The drain line from vault shall drain into the wet well. The interior and exterior of the vault shall be coated the same as the wet well and dry well, refer to Section G. The flow meter vault shall also be equipped with a discharge pressure transducer, with double blocking & bleed valves, see detail LS-XX. The pressure transducer shall be and Endress+Hauser PMC71 or as approved by the District. An ultrasonic level sensor and transmitter (Siemens, XPS-15F and Hydro-Ranger 200 HMI) shall be installed for wet well level indication and pump control. The level sensor shall be mounted within the wet well and the transmitter shall be installed within the lift station control enclosure. The level transmitter shall be capable of sending a Hart compatible 4-20 mAmp signal to the telemetry system and shall be located in the wet well to obtain maximum range. At the District's discretion, a rain gauge may be required at the site. When a rain gauge is required, a minimum of 1 dry contact shall be provided to the PLC for the telemetry system.



The rain gauge shall be a HyQuest Solutions TB3 or an approved equal.

S. Lift Station Control Functions

All pump control logic shall be programmed in the PLC and local operator interface. The PLC and local operator interface programs shall match existing pump station programs for content and structure. The Contractor shall request an electronic version of the standard PLC and local operator interface programs from the District for their use upon execution of the Confidentiality and Non-disclosure Agreement. Pump controls shall operate in the following manner:

1. A Siemens level transmitter and transducer shall be used by the control system to

operate the pumps automatically in a Lead/Lag(s) configuration. 2. Each pump shall have an associated Hand-Off-Automatic selector switch.

o In hand position, the pumps will operate continuously. In Off position, the pumps will not operate.

o In automatic position, the pumps will operate in response to the Lead/Lag pump control sequence.

3. The lead pump shall start when the level in the wet well exceeds the lead pump start level set point.

4. The lag(s) pump shall start when the level in the wet well exceeds the lag pump start set point.

5. All pumps shall stop when the level in the wet well falls below the pump stop setpoint. 6. All pump control permissive and protection features shall be handled by a self contained

pump logic module or micro PLC.

Provide the ability for the operator to adjust the pump start/stop level set points locally. Provide a Lead/Lag/Alternate control selector that will allow the operator to select the Lead/Lag(s) pump sequence or to place the pump control into an automatic alternation mode. In automatic alternation mode, the control system shall automatically switch which pump is Lead when all pumps are detected as not operating. Provide pump failure recovery if a Lead or Lag(s) pump fails to operate. The pump failure recovery control shall start the next available pump in the operating sequence to take the place of the failed pump. Provide an alarm signal to the telemetry system upon detection of a pump failure. Provide auxiliary contacts that confirm motor starter is engaged to be used in conjunction with the check valve switches for pump run status. Provide (non-mechanically operated) switches on check valves to confirm pump run. Check valves should interlock with pump controls for protection of equipment.

In addition to the transmitter and transducer, install a float-style level switch in the wet well to detect a high wet-well level condition. The level switch elevation shall be a minimum of seven (7) inches below the lowest gravity sewer inlet pipe. Annunciate the alarm on the local operator interface. Provide an alarm signal to the telemetry system when a high wetwell level condition is detected.



Provide hard-wired backup pump control circuitry. Backup control for the pumps shall follow the criteria listed below:

Both pumps shall be signaled to start from the backup sensing device.

The primary pump shall start immediately once the backup sensing device is triggered. It should continue to run until an adjustable time (but not more than 5 minutes) after the sensing device is returned to normal condition.

The secondary pump shall start after the backup sensing device has triggered and after an adjustable amount of time has passed (but not more than 5 minutes). It shall continue to run while the backup sensing device is engaged and until the primary pumps system has completed its backup cycle.

Shall be handled within the pump logic module or micro PLC independently for each pump.

Shall be wired to only work if the Pump package is set to an auto status, and works in tandem to back up the RTU PLC controls.

Each pump shall be provided with 4-20mA current sensors that shall be monitored by the PLC system. The system shall be capable of sending alarms as determined by the District and shall include low warning, low alarm, high warning and high alarm. Provide running and fault status signals to the PLC system for all pumps, compressor, motors, fans and other equipment as identified by the District. Provide computed running hours for each within the PLC code. Provide any additional related signals as directed by the District. A smoke detector shall be installed within the pump station with the location to be determined by the District. Provide an alarm signal to the telemetry system if smoke is detected. Smoke detector shall be resettable and equipped with a dry contact relay for output signals to the PLC. An intrusion detection system shall be provided for the pump station access, wet well, storage covers, the standby generator enclosure access doors, meter and bypass pumping vaults and specified electrical enclosures as defined by the District. The intrusion detection equipment and sequence of operation shall be specified by the District. All switches shall be wired in a normally open held closed method. Provide an alarm signal to the telemetry system upon detection of an intrusion event. Manual alarm reset shall be required at the lift station. District preferred intrusion switches include:

Dry locations such as vault lids and doors: IFM Efector, Model: IM0055

Intrinsically safe or wet areas: IFM Efector, Model: NM500A Provide standby generator system status signals to the PLC system to monitor generator running, low fuel, intrusion detection on all door(s), battery charging status and other power system signals as directed by the District.

Provide ATS system status signals to the PLC to monitor ATS switch on utility/Source 1, ATS switch on Emergency power/Source 2, Intrusion detection on door, retransfer notification, ATS alarms or alerts and other system signals as directed by the District.



Provide a control output from the PLC system that will allow the control system to automatically or remotely command the generator to start and stop. Provide a control output from the PLC system that will allow the control system to automatically or remotely command the Auxiliary (Standby) Power System to exercise under load. A minimum of one Operator in Trouble annunciation system shall be installed. The Operator in Trouble system hardware and sequence of operation shall be specified by the District. Provide a PLC panel power, UPS System, DC power systems failure alarm signal to PLC and other system signals as directed by the District. Provide a RTU cabinet temperature sensor connected to the PLC. Provide Signals for Temperature, Low and High temperature alarming and other system signals as directed by the District. Provide any additional system signals based on provided equipment as directed by the District. All components within the lift station system, including both internally- and face-mounted instruments and devices, shall be clearly identified with phenolic nameplates of black background with white letters and shall be installed prior to startup & testing of the lift station.

T. Wiring

All control wiring shall be marked with permanent machine printed wire labels at both ends. All wiring entering or leaving a control panel shall be landed on terminal strips within the control panel Layout. All terminal strips shall be marked with permanent machine printed labels manufactured specifically for the provided terminal. All wiring shall be copper. All wiring that goes below grade shall be of XHHW type or equivalent All Wiring within control panels shall be MTW or THHN/THWN-2 Use the District wire color code provided below. Deviations from the District’s wire color code are not allowed without written permission from the District.

Description 120/208V 277/480V Control

Phase A Black Brown

Phase B Red Orange

Phase C Blue Yellow

Neutral White Grey White

Ground Green Green Green

120V Control Red



120V Control Neutral White

Description 24V/DC Control

DC Common - White With Blue stripe

DC Control + Blue

DC Signal (Discrete) Purple

Description DC Signaling

Analog Signaling + White or Red

Analog Signaling - Black

All Analog Signals Shall be prepared in a Shielded/Unshielded method, as shown in Detail LS-9.

The District has established a naming convention for equipment numbering, conduit numbering and wire labeling that shall be used. The Developer shall request and obtain the Districts a current version of the memorandum “Numbering System for all Non-GIS based Assets” prior to design. All labeling shall be in place prior to startup & testing of the lift station.

U. Motor Control

All pump controls including motor starters and main circuit breakers shall be located outside of the lift station electrical enclosure on the electrical equipment service rack or enclosure. There shall be a Hand-Off-Auto (HOA) station located near the pump motors and within the drywell where applicable The HOA panel shall provide digital display of Pump(s) Amperage, Wet Well Level, an HOA Switch for each pump and other system signals as directed by the District. All pump motors shall have an independent circuit breaker and shall be capable of being locked out. All motors shall have a main circuit breaker located outside the pump station electrical enclosure as part of the electrical service entrance equipment. There shall also be a local disconnect located near and/or within sight of the pump motors. Pump controllers shall be Allen Bradley Power 6-pulse Flex Series, or approved equal for VFD’s for motors 20 hp or higher. Provide VFD harmonic mitigation (eg. Active Harmonic Filter) as necessary to comply with IEEE 519 using a point of common coupling located at the electrical service main disconnect All pump starters for motors smaller than 20 hp shall be Allen Bradley brand SMC FLEX soft starters. All pump soft starters, variable frequency drives, overloads, and contactors shall be provided with Ethernet connectivity and other model options as directed by the District and connect to the PLC in the RTU. All devices will be require to have a hardware signal for starting, stopping, speed reference, and other system signals as directed by the District.. At the discretion of the District, the sewer lift station shall contain interlocks to lock out any pump or pump(s) upon a generator run to avoid overloading the generator. The lockout shall be automatically overridden on operating pump failure such that the failed pump is automatically replaced by previously locked out, operable pump while continuing to avoid generator overload.



V. Telemetry

The PLC system for the lift station shall include the local pump station telemetry functions. The Contractor shall provide all equipment consistent with the District Standards at the lift station required to provide the communications functions, and all required central-based equipment at the District’s office. Telemetry shall be compatibly configured within the pump station PLC system to match the operation of existing pump station telemetry systems and shall send all signals to the District office. The data parameters that shall be communicated between the pump station and the District office will be provided by the District upon execution of the Confidentiality and Non-disclosure Agreement. The telemetry between the central based system and the Type 1 and 2 lift station site shall be coordinated with the District for direction between Options A or Option B Option A: Communication methods and materials as directed by the District. Option B: A voice-grade circuit leased to the District from the telephone service supplier. The Developer shall coordinate with the District to ensure proper circuits are furnished. Provide the following communications devices:

Modem Multitech modem Multitech MT 5600BA

Modem Multitech modem Multitech MT 5600BR

The Multitech MT 5600BA shall be installed within the RTU for communications along with a telephone line protector unit. The unit shall protect the equipment from transient and electrical surges on the telephone line. The protector shall include 1/2 amp line fuses and voltage clamps for voltages over 25 volts. Gas tubes shall be provided as an integral part of the lightning protection unit. The Multitech MT 5600BA shall be provided to the district prior to connection and testing. Provide a minimum of a 16”X16”X6” (Pentair A16R166HCR) enclosure for the telephone service suppliers equipment. It shall be located at the lift station site on the electrical rack.

W. Other Equipment Check valves shall be the spring assisted external swing-arm type.

Provide a bypass pumping connection with quick disconnect type fitting such as Camlock or an approved equal. Size pumping connection and quick disconnect fitting for peak flow with a maximum velocity of 8 feet per second; size shall be a minimum of 4-inch and a maximum of 6-inch diameter or larger as determined to accommodate the required flow. Location of bypass shall be readily accessible as determined by the District.



When determined by the District that the bypass pumping connection be in a vault. The vault floor shall slope to a floor drain with an elastomeric trap guard. The drain line from vault shall drain into the wet well. The interior and exterior of the vault shall be coated the same as the wet well and dry well, refer to Section G. Pending the site and vault location, the District may require the vault to be equipped with intrusion switches, flood switches, a light, and with an H20 or H30 rated 36”x72” LW Products HD Access hatch or approved equal access hatch. Provide emergency eyewash shower if chemicals are used onsite.

X. General Site Conditions

Provide adequate access for a tandem rear-axle-style maintenance vehicle. Access shall be paved with 6-inch of asphalt or 6-inch of concrete and shall include a pullout in the road alongside the lift station to allow a maintenance vehicle to pull out of traffic while unlocking the gate. The design shall show turning radius adequate for maintenance vehicle ingress and egress. Provide a perimeter 6-foot cyclone 1-inch mesh security fence with a 16-foot split-gate opening with an appropriately located 3-foot man gate. Galvanized chain link fence fabric shall be PVC-coated or Polymer-coated fabric. Fabric color shall be dark green. Unless otherwise approved by the District, provide dark green polyethylene-tubular-privacy slats with UV inhibitor, sized to fit mesh. Provide three (3) rows of barbed wire across the top of fence and gates. Provide a potable water connection and freeze-proof yard hydrant hose bib in accordance with all applicable plumbing codes and Division 2 Water Installation. A reduced-pressure backflow preventer shall be housed in a hot box. Provide power and electrical outlet to the hot box with heat tape installed to prevent freezing. The heat tape shall be plugged into a GFCI protected electrical receptacle installed in the hot box and have LED lighted indication for power. Above ground structures, if needed, shall be constructed of decorative CMU block with a standing seam metal roof. Block and roof color and styles to be approved by the District. Site surfacing shall consist of asphalt concrete with catch basins as needed to accommodate surface water runoff to the storm water drainage system unless otherwise directed by the District. Asphalt concrete shall be sloped to the catch basin. At each location on the lift station site where confined space entry is required, provide and install stainless steel flush floor mount sleeves into concrete for the District's Miller Durahoist Portable Confined Space Safety System davit crane. Flush floor mount sleeves shall be Miller DH20SS or equal and shall be compatible with the District's safety system. Provide stainless steel sleeve caps to keep debris from entering the sleeve. Provide a ½-inch weep in the bottom of the sleeve to prevent sleeve from filling with water. Provide odor control to achieve detectable odor threshold units specified by the governing local code. Odor control system shall be approved by the District.



Some locations may require landscaping as determined by the District and or by local land-use agency. When required, use low-maintenance landscaping that can tolerate no irrigation. Provide mouse-proofing where applicable to ground-mounted structures. All keys, miscellaneous items, and spare parts shall be given to the District prior to acceptance. Provide a switch controlled light for night time work or as required by the District for security of the station and yard. Provide a manual switch located inside the electrical enclosure or as directed. Lighting shall be installed in such a way to minimize light disturbance to adjacent properties. All lighting onsite shall be of LED type. All structures classified as Class 1 Division 1 environment that may require access at night shall be provided with appropriate light fixtures. The objective is a non-obtrusive, clean, neat site. Outside signage, including pump station identification and safety notification requirements for confined space entry and any chemical storage, shall be provided as specified by the District. A tract of land shall be deeded to the District to encompass the Type 1 or 2 lift station that provides sufficient and safe access for District staff and designated third party service providers for operations, maintenance, and construction of the station. Pending site location, the District may require the installation of a security camera system. Security camera locations and system will be determined by the District.

4-1.040 Type 3 Lift Stations –Individual Grinder Pumps AA. Lift Station

The Type 3 lift station requires a side sewer permit and inspection. Type 3 lift station shall have one grinder basin assembly per residence and/or unit. Each grinder basin assembly shall have one independent power source per residence and/ or unit. A grinder basin shall not be shared between a residence and/ or unit. The Type 3 lift station with shared side sewer shall require each residence and/or unit to have an individual force main terminating into a common gravity sewer service. The Type 3 lift station and force main are maintained by the property owner. Property owner shall enter into an agreement with the District regarding maintenance provided by the owner.

BB. Piping



The force main shall meet the requirements of Division 3, Sewer Installation. A inch and a quarter outside diameter HDPE Force main shall connect to the 1-1/4- inch diameter stainless pump discharge line leaving the wet well. HDPE pipe shall have butt-fused joints completed in accordance with manufacturer’s recommendations. It is recommended the inch and a quarter private non-metallic force main be installed with a tracer wire or other means for locating in the future.

For single residence and/ or unit, the force main shall connect to a gravity side sewer in accordance with Division 5, Detail Drawing SS-7. For a shared gravity sewer by multiple single residence’s and/ or units, each residence/ and or unit shall have an individual force main connecting into a common gravity side sewer as directed by the District.

CC. General

A reduced pressure backflow assembly (RPBA) shall be installed directly behind the domestic water meter in accordance with the District’s Premise Isolation Cross-Connection Control Program. . The installation of the RPBA shall be per Division 2, Water Installation.

Alderwood Water & Wastewater District Adopted 4/24/2017 Standards & Guidelines Division 5 – Side Sewer Installation Page 1 of 10

DIVISION 5

Standards

for

Side Sewer Installation


Division 5

Standards for Side Sewer Installation

Table of Contents 5-1.000 SIDE SEWERS ...........…………………………………………..…............................….3 5-1.010 General……………...………………………………………………………………………..3 5-1.020 Permits………………………………………………………………………………………..3 5-2.000 CONSTRUCTION STANDARDS.…………………………………………………………4 5-2.010 General…………………………………………………………………………………….....4 5-2.020 Materials……………………………………………………………………………………...5 5-2.030 Size…………………………………………………………………………………………....6 5-3.000 INSTALLATION……………………………………………………………………………..6 5-3.010 General…………………………………………………………………………………….....6 5-3.015 Tapping and Abandon/Capping…………………………………………………………....7 5-3.020 Trench Excavation……………………………………………………..…………………....7 5-3.030 Pipe Installation……………………………………………………………………………...8 5-3.040 Inspection………………………………………………………………………………….....9 DETAILS Standard Side Sewer........................................................................................................... SS-1 Private Side Sewer Installation............................................................................................ SS-2 Alternate Private Side Sewer Installation.......................................................................... SS-3 Grease Interceptor............................................................................................................... SS-4 Oil/Water Separator............................................................................................................. SS-5 Oil/Water Separator (Cover Options Details)...................................................................... SS-5A Open.................................................................................................................................... SS-6 Pumping Side Sewer Pressure Connection to Gravity Sewer............................................. SS-7 Check Valve Assembly (Side Sewer Application)................................................................ SS-8


5-1.000 SIDE SEWERS 5-1.010 General All connections to public sewer shall be by a gravity connection unless approved otherwise by the District. All connections to public sewer whether by connecting to an existing lateral or by tapping an existing public sewer main shall be completed under the terms of these specifications and requirements. These standards do not relieve the property from compliance with all other jurisdictional requirements relative to other building, mechanical, and construction permits. Applicants shall comply with all District resolutions, standards and requirements, and permit conditions. Work within public right-of-way requires a separate permit from the jurisdictional authority. Each single family residential lot and commercial building shall be serviced by a single side sewer connection to the public main. Joint use of a single 6-inch side sewer that serves more than one single family or multi-family unit may be approved by the District if; a) the number of Equivalent Residential Units (ERU) is equal to or less than 4.0 and; b) if individual sewer pipe from the main is not possible as determined by the District. See chart below. All joint use side sewers shall be approved by the District.

Type Equivalent Residential Unit (ERU)

Single Family 1.0

Multi-family (attached) 0.8 per unit

Motel/Hotel/Mobile Home Park 0.4 per room or space

RV Park 0.4 per space

All commercial facilities requesting service connection shall complete a Sewer Use Survey (available on the District website) and shall comply with the District’s current pretreatment policy. Each non-single family building shall have its own side sewer. If it is determined by the District the facility will be preparing food or otherwise generating fats, oils and grease, the customer shall be required to install a grease interceptor. The applicant shall submit a plan indicating the type, size and location of the grease interceptor and install it as part of the buildings plumbing. A scheduled maintenance plan is the responsibility of the property owner. If a grease trap is allowed instead of a grease interceptor, it shall be sized and installed as per the current edition of the Uniform Plumbing Code (UPC) and approved by the District prior to installation. 5-1.020 Permits Prior to any connection to an existing side sewer stub or connection to an existing sewer main, the Developer, property owner or agent shall first obtain a side sewer permit from the District. For work within the public right-of-way, District easement, or private easement, a Cash Performance Guarantee is required. Certain unusual circumstances may require additional fees. The following types of permits are issued. Applicants shall comply with all District resolutions, standards and requirements and permit conditions.


A. Standard Side Sewer Permit (Includes Add-on Permits). A Standard Permit is required for all

new connections to the public sanitary sewer system. The Standard Permit is for that portion of the side sewer beginning 2-feet from the building or structure and continuing to the connection to the public sanitary sewer system. The building sewer which includes all interior plumbing and continues to 2-feet outside of the building or structure is considered part of the building, plumbing and/or construction permits.

B. Dry Side Sewer Permit. A Dry Permit may be available for purchase in certain situations when a property, building or structure is not ready for construction and/or connections to the public sanitary sewer facility, but it is desirable to install a portion of the side sewer from the sewer system to a point within the property, but is not connected to any sewer user. This is called a “dry side sewer”.

The District will determine when a Dry Side Sewer Permit is used.

A separate permit shall be required to make the final connection to the building or sewer user.

C. Revision Side Sewer Permit. A Revision Permit is required when a property has existing

sanitary sewer service but is proposing a revision to the service outside of the building or structure. This may be the result of adding additional buildings or structures, or remodeling existing buildings or structures. The District will determine when a Side Sewer Revision Side Sewer Permit is applicable.

D. Capping Side Sewer Permit. A Capping Permit is required when side sewer service is being discontinued or is abandoned. The sewer lateral shall be cut and capped at the main line unless otherwise determined by the District.

5-2.000 CONSTRUCTION STANDARDS 5-2.010 General Side sewer installation shall be in accordance with the latest edition of the Uniform Plumbing Code as modified by these standards. The intent of these District Side Sewer Standards is to reasonably ensure that properties connecting to the District's system have a good quality private sewer service connection to the District's public sewer system. While the District has established standards and conducts installation inspections, the ultimate responsibility for all private side sewers rests with the property owner. For work within public right-of-way, all requirements of the right-of-way permit shall be met.


5-2.020 Materials A. Pipe: All materials shall be manufactured of premium quality materials and shall conform

to all approved applicable standards, shall be free of all defects and shall pass all required testing.

The following materials are approved for side sewer installation:

Sewer Material Standard

Ductile Iron

ANSI/AWWA C151/A21.51, ceramic epoxy lined, Class 50 for 6-inch, Class 50 for 4-inch minimum

Type PSM, Polyvinyl Chloride (PVC)

Sewer Pipe

SDR 35 ASTM D 3034

Polyvinyl Chloride (PVC) Pressure

Pipe AWWA C-900, C-905

ANSI/AWWA C-900 & C-905, DR 18

Polyvinyl Chloride (PVC) Schedule

40 Plastic Pipe

ASTM D 1785

High Density Polyethylene Pipe

(HDPE)

ASTM D3350 SDR 11

Acrylonitrile Butadienene Styrene (ABS) Plastic Drain and Vent Pipe

(with prior approval)

ASTM Spec D 2661or F 628

Cast in Place Pipe (CIPP)

(with prior approval)

ASTM F1216 or ASTM F1743

Ductile iron shall be furnished with flexible gasket joints. Both ABS and PVC Schedule 40

pipe may be installed using solvent welded type fittings or rubber gasket joints conforming to their respective ASTM Specifications. Type PSM PVC sewer pipe shall be installed using elastomeric gasket joints and fittings in accordance with manufacturer's recommendations. C-900, C-905 and HDPE are considered on a case by case basis. Other materials may be approved by the District.

B. Tapping Saddles: For ductile iron pipe: stainless steel tapping tee is required and shall be

Romac, Smith-Blair, or Ford. For PVC, concrete, or HDPE pipe: Romac Style “CB” Sewer Saddle (or approved equal) shall be used. C. Transition Couplings: Approved couplings such as Romac 501, Smith Blair, or Ford shall

be used when transitioning from one pipe type to another. For instance, from ductile iron


to PVC, or from concrete to PVC. Couplings for C-900 to SDR -35 can be Specified Products gasket joint PVC adaptors or approved equal. Transitioning to SDR 35 is allowed if depth at transition is less than 16 feet

D. Capping Materials: Approved material for capping sewer laterals and side sewer pipe by pipe type are:

Concrete pipe: a mechanical pressure plugs manufactured by Taylor Made Plastics or approved equal shall be sized to fit in the bell of the existing tee, larger than the 6-inch I.D.

PVC pipe: a PVC cap or spigot plug with rubber gasket.

Ductile iron pipe: a MJ plug. 5-2.030 Size The portions of sewer laterals in right-of-way and easements shall be 6-inches minimum. The side sewer may be 4-inches for single family residences once outside of right-of-ways or easements. Side sewer for single family residences shall be no less than 4-inches. Side sewers for commercial and multi-family shall be no less than 6-inch. All commercial buildings shall have a separate sewer stub for each separate building. Side sewers for duplex units shall be no less than 4-inches when an individual service connection is used. If served by a single stub, the stub shall be a minimum 6-inch where the line is used jointly with a separate 4-inch service to each side. If one connection to the duplex is used, a minimum 6-inch is required. Side sewers for single family residences approved by the District for a joint use side sewer shall be a minimum 6-inch in areas of common use. 5-3.000 INSTALLATION 5-3.010 General Side sewer installation shall be in accordance with the latest edition of the Uniform Plumbing Code as modified by the District and these specifications and details. Only properly insured general contractors or utility contractors licensed and bonded with the State of Washington shall perform side sewer installations within the public right-of-way or within private easements. A copy of the license shall be provided to the District. Nothing contained in side sewer permit shall create any contractual rights between the District and any person or firm employed to do the Work. If the property owner desires to perform the work themselves on their property, the property owner shall indicate this on the application form and shall comply with District Standards. The pipe and jointing materials for the sewer lateral along with the manner in which they are installed, shall be of the same style and materials as the main to which they are connecting.


If not connecting to the building or structure, each sewer lateral and side sewer shall be capped and blocked in accordance with the Standard Details. On private side sewers, cleanouts are required every 100 feet, at 90 degree bends, or combinations of bends greater than 45 degrees. No vertical or horizontal bends shall be allowed in the public right-of-way or sewer easement without specific authorization by the District. See Division 3 for other standards and details applicable to this section. 5-3.015 Tapping and Abandoning/Capping When excavating around existing sewer mains, great care shall be taken to not damage the existing sewer line. When the sewer lateral installation requires the tapping of an existing District sewer mainline or capping of an existing side sewer or lateral, the materials shall be provided by the Contractor. The Contractor shall be responsible to provide all equipment, staff (including certified flagger(s) if needed), excavation, approved shoring, ladder, dewatering, backfilling, compacting, restoration and materials to assist District forces in tapping existing sewer line or witnessing the capping. A. Tapping. The Contractor shall schedule District forces a minimum of three (3) business

days in advance. Taps shall be scheduled for Tuesday, Wednesday, or Thursdays. The Contractor prepares the trench in accordance with all safety standards and provides 1-foot distance around the existing sewer main. Shoring shall not be supported by the mainline. District forces will install the tapping tee provided by the Contractor and make the tap. The Contractor shall install the pipe from the tapping tee to the property.

B. Abandoning/Capping. The Contractor shall excavate the existing tee on the mainline and

plugs or caps the existing tee. 1. For existing concrete lines: A mechanical plug sized to fit the existing bell but larger than

6-inch inside diameter is used. See section 5-2.020 for type. The plug is inserted and grouted. Abandoned piping is either removed or grout plugged and filled with flowable Control Density Fill (CDF). Method to be determined by the District or jurisdictional authority, whichever is more stringent shall apply.

2. For existing PVC lines, a spigot PVC plug shall be inserted into the existing tee or a PVC cap with rubber gasket placed on pipe within 1 foot of mainline. Inspection is required prior to backfill.

3. For existing ductile iron lines, a MJ plug shall be installed with gasket and bolts on the tee.

4. Inspection is required on capping of sewers laterals prior to backfill.

5-3.020 Trench Excavation Trench excavation shall be accomplished with suitable equipment to provide the minimum lines and grades required. All excavations shall comply with applicable Federal, State and local regulations. The Contractor shall be responsible for all trench safety requirements. Over-excavation of trenches shall be brought back to required grade by installation of select backfill material and compacted to 95% of maximum density or as directed by the District.


Unsuitable materials, such as peat, clay and muck, shall be removed to at least two feet below grade or as directed by the District, and replaced with select backfill material capable of being compacted to 95% maximum density as directed by the District. Trench excavations shall achieve the following results:

Be neat, clean and straight between bends.

Be of proper grade, minimum 2 percent and maximum 45 degrees (100 percent).

Utilize method of pipe supporting acceptable to the District and evaluate other options, such as increasing the pipe run to allow for flatter slopes, prior to the District allowing pipe grades in excess of 45 degrees (100 percent).

Slopes in excess of 45 degrees (100 percent) shall require special blocking and lateral supports and may require an increased standard of pipe i.e. ductile iron.

Be constructed and left in a safe manner in accordance with appropriate regulatory authorities.

Properly coordinated with the sewer lateral and/or side sewer installation and inspection so as to minimize the time trenches are open.

Promptly backfilled upon approval of pipe installation. 5-3.030 Pipe Installation Pipe Installation shall proceed in conjunction with trench excavation. Pipe installation shall be in accordance with the Uniform Plumbing Code as modified by these standards. Minimum grade is 2 percent. Special circumstances may require consideration of grades less than 2 percent, but all such cases require prior approval by the District. Maximum grade is 45 degrees (100 percent). Grades in excess of 45 degrees (100 percent) shall be considered subject to special restraining in accordance with the standard details. All side sewers shall be bedded with pea gravel or with prior approval by the District, 1/2-5/8 minus crushed rock may be used. Cleanouts shall be required and installed as follows:

At the building connection, as directed by the District.

No less than every 100 feet.

At all changes in directions in excess of 45 degrees. If combinations of bends have straight pipe runs of 4-feet or greater between bends, that shall not be considered an aggregate change of direction.

If directed by District, a change of direction (total of bends) exceeds a total of 135 degrees

Installed to allow for cleaning in the direction of flow.

Cleanouts installed in paved or concrete roads, driveways or walkways, shall have a frame and cover installed in accordance with Division 3 of these standards.

No connections from downspouts, gutters, footing drains or outside drains or any other feature receiving or exposed to rain or ground water shall be allowed to sewers. Side sewers shall be a minimum of 18-inches deep at 2-feet from the outside foundation wall or structure. Suitable grade transitions (fittings) shall be installed between the structure and the side sewer to achieve the desired depth.


5-3.040 Inspection All side sewers shall be tested and inspected by the District prior to backfilling. Any work that has been covered and which the District did not inspect shall be uncovered to allow for inspections and testing. A. Advance Notice. It is the responsibility of the person authorized by the permit to perform

the work to provide notice to the District that the work is ready for inspection. Such notice shall be at least one business day before the desired inspection date. The District will schedule the inspection as near the desired time as possible subject to the District’s availability.

B. Responsibility. It shall be the responsibility of the person authorized by the permit to

ensure the side sewer is complete and shall stand all prescribed tests prior to the desired inspection date.

C. Tests. After pipe inspection, pipe shall be secured with backfill prior to pressure test. All

tests shall be conducted in the presence of the District. The person authorized to complete the work shall be present during the inspection and testing periods.

Tests shall be made for minimum grade. Visual inspections shall be conducted on all alignment, grade, backfill, and other items the District deems relevant. Water tests shall be completed by plugging the side sewer and filling with water to the point of overflow. The sewer shall be tested in its entirety or in sections as directed by the District. Water shall be kept in the side sewer for a minimum of 15 minutes. The system shall be water tight with no visual or measurable leakage. An alternate to water testing is a standard air pressure test of 4 pounds per square inch of pressure for a 5-minute period with no measurable loss of pressure. Grinder pump pressure lines shall be water tested at 80 psi for 5 minutes

D. Corrections. Notices of corrections or deficiencies shall be given at the time of inspection or

written and delivered to the permittee or their authorized representative. All corrections and/or deficiencies noted by the District shall be corrected prior to

scheduling a re-inspection. E. Re-testing. After all corrections and/or deficiencies noted by the District have been

corrected, the permittee shall again schedule an inspection with the District. Additional corrections and/or deficiencies may be noted at this time.

F. Additional Payment. If a side sewer does not successfully pass an initial and subsequent

re-test, the applicant shall be subject to payment of an additional side sewer permit fee prior to any additional inspections.


G. Approval. Upon the satisfactory testing and upon satisfactory evidence that all interior plumbing has been approved, the side sewer shall be approved for use and operation by the District and allowed to discharge into the District sewer system.

Alderwood Water & Wastewater District Adopted 4/24/2017 Standards & Guidelines Division 6 – Trenchless Installation Page 1 of 11

DIVISION 6

Standards

for

Trenchless Installation


Division 6

Standards for Trenchless Installation

Table of Contents 6-1.000 TRENCHLESS INSTALLATION ...................................................................................................... 3 6-1.010 General ...................................................................................................................................... 3 6-1.020 Qualifications ............................................................................................................................. 3 6-1.030 Trenchless Submittals ................................................................................................................ 4 6-1.040 Construction Standards ............................................................................................................. 5 6-2.000 MATERIALS ................................................................................................................................ 5 6-2.010 General ...................................................................................................................................... 5 6-2.020 Casing Pipe ................................................................................................................................ 6 6-2.030 Casing Spacers ........................................................................................................................... 6 6-2.035 Annular Filler .............................................................................................................................. 6 6-2.040 Carrier Pipe ................................................................................................................................ 6 6-2.050 Fittings ....................................................................................................................................... 7 6-2.060 Drilling Fluid ............................................................................................................................... 7 6-3.000 INSTALLATION ........................................................................................................................... 8 6-3.010 General ...................................................................................................................................... 8 6-3.020 Trenchless Installation .............................................................................................................. 8 6-3.030 CIPP Liner Installation- Rehabilitation ..................................................................................... 10 6-3.040 Cool Down ................................................................................................................................ 11 6-3.050 Finish ....................................................................................................................................... 11 6-3.055 Sliplining Installation- Rehabilitation ....................................................................................... 11 6-3.060 Testing and Acceptance........................................................................................................... 11 DETAILS Typical Casing Detail.................................................................................................................TI-1


6-1.000 TRENCHLESS INSTALLATION 6-1.010 General The District may allow the use of trenchless methods to complete portions of water and/or sewer projects and extensions. The use of trenchless methods will require special approval of the District. Trenchless methods shall only be considered when other standard methods of construction cannot be completed in a reasonable or economical fashion. Any use of trenchless methods shall be at the Contractor's complete risk as to the ability to satisfactorily complete the utility installation in compliance with District standards. Methods the District is willing to consider and evaluate include:

Horizontal Directional Drilling (HDD) Microtunneling Pipe Jacking Pipe Bursting Auger Boring Pipe Ramming Cured in Place Pipe (CIPP) for rehabilitation Sliplining for rehabilitation

Each of these methods may be suitable for different site conditions, soil types, water table levels and utility size and type. Consideration shall be given to those issues when the Contractor is proposing a method to the District. 6-1.020 Qualifications The Contractor shall demonstrate to the satisfaction of the District that the Contractor is qualified to perform the work. The District reserves the right to contact references and investigate past performance and qualifications of the Contractor. The District may contact references for other projects, including District projects, even though the Contractor did not identify those projects and /or references. Poor references may be justification to determine that the Contractor is not acceptable for the proposed method. The Contractor shall provide references and, at a minimum, the information required by each item set forth below. A. Trenchless Contractor:

Specializes in trenchless installations for a minimum of the last five years.

Has completed at least three trenchless installations in the last two years using the type of trenchless system proposed in the approved plans.

The three installations noted in the above must have been constructed in conditions of a similar nature and geology to those indicated in the approved plans, including work in granular soils, dealing with frac-out situations, and cleanup and disposing of bentonite.

B. Trenchless Superintendent:

Has experience on at least three trenchless Installations in the past two years using the type of trenchless system proposed in the approved plans.

Experience must include projects that have been constructed in conditions of a similar


nature and geology to those indicated in the approved plans.

The superintendent’s responsibilities on each project must be documented. C. Trenchless Operator:

Experience as a trenchless machine operator on at least three trenchless installations in the past two years using the type of trenchless system proposed in the approved plans. Experience must include projects that have been constructed in lengths and conditions of a similar nature and geology to those indicated in the approved plans.

The trenchless operator’s responsibilities on each project must be documented. D. Trenchless Designer:

Registered professional engineer licensed in the State of Washington with a minimum of three years experience in trenchless design and construction of installations for the proposed trenchless method. Previous installations shall be similar in diameters, lengths and conditions of a similar nature and geology to those for the proposed installation location..

E. Additional Qualifications:

The District may request additional information depending on trenchless method approved for installation, to demonstrate that the Contractor is qualified to perform the Work. The information may include: a) Drilling Fluids Engineer:

Minimum of two years experience with slurry design used in trenchless installations in granular and abrasive soils. Minimum of two years experience with slurry separation systems and additives to be used for effective soil separation for all soil types and quantities indicated in the Drawings.

b) Biological Monitor:

Fisheries biologist with a minimum of 10 years experience in local sensitive species identification and surveys, experience with fish life status, salmon habitat requirements, and water quality issues.

c) Surveyor:

Surveyor shall be a professional land surveyor who is licensed in the State of Washington.

6-1.030 Trenchless Submittals Contractor shall provide the District with a trenchless submittal applicable to the trenchless method approved that may include the following as appropriate: A. Trenchless system plan for each drive. Resubmit for all modifications to that previously

accepted. Certifications that pits are constructed as required and certified for trenchless operations.

B. When CIPP or Sliplining is approved for rehabilitation of existing mains, submittal must address maintaining and re-connecting customer services, side sewer laterals and or water service connections.


C. Reports and records:

1. Alignment surveys and checks: prior, during, and at completion of pipe installation. 2. Daily trenchless operation records and measurements, and welding records including an

electronic copy of the trenchless system electronic digital drive record. 3. Well decommissioning reports and permits. 4. Start up test results. (Microtunneling) 5. Status of dewatering prior to pit wall penetration. 6. Field testing results. 7. Material catalog cut sheets.

D. Pipe repair procedures. E. Pipe repair certifications.

F. CCTV documentation of casings and pipes.

G. Tunnel Safety Plan. (Microtunneling)

H. Frac-Out Mitigation and Contingency Plan.

I. Pre-tunneling meeting minutes. (Microtunneling)

J. Obstruction removal records and testing results.

K. Annular filling plan

L. Bypass pumping plan if existing sewage flow is affected. See Division 3 for basics. 6-1.040 Construction Standards All materials, installation and workmanship shall be in accordance with the latest District standards and the latest edition of the State of Washington Standard Specifications for Road, Bridge and Municipal Construction. All applicable standards for water and/or sewer installations, Divisions 2, 3 and 7, shall also apply. 6-2.000 MATERIALS 6-2.010 General The Contractor shall furnish all material as noted herein and as indicated on the approved plans and as required to complete all work. All materials shall be manufactured with premium material and comply with all referenced standards.


6-2.020 Casing Pipe Casing pipe is typically used in microtunneling, pipe jacking, auger boring and pipe ramming applications. Calculations shall be provided for the proposed casing pipe material demonstrating sufficient capacity to accommodate highway loading during the life of the project and loading during installation. Casing pipe shall conform to all industry standards. Casing pipe that may be considered for District review includes steel or approved equal by the District. 6-2.030 Casing Spacers Casing spacers shall be used to support the carrier pipe inside the casing pipe. Casing spacers shall be equally spaced within the casing and shall be sized to center the carrier pipe within the casing pipe or as necessary to achieve desired slope. Casing spacers shall be as manufactured by Advanced Products and Systems Stainless Steel Band Casing Spacers, Model SSI, or Cascade Waterworks Manufacturing Company Stainless Steel Casing Spacer or approved equal. See Standard Detail TI-1. 6-2.035 Annular Filler The annular space between the carrier pipe and casing pipe shall be filled with sand that conforms with Section 9-03.1 (2)B of the WSDOT Std. Specs for Class 2 Fine Aggregated gradations. Other materials shall be approved by the District prior to installation. Method of installation of the annular filler shall take into consideration the impacts to the adjacent surroundings. An annular fill plan shall be included with the product information for District review. 6-2.040 Carrier Pipe For Horizontal Directional Drilling(HDD) applications the carrier pipe is typically installed without a casing pipe. For HDD installations the carrier pipe shall be high density polyethylene pipe (HDPE). For CIPP, the CIPP shall extend from end-to-end of the section being lined in a continuous jointures, seamless, tight fitting pipe-within-a-pipe with a Thermosetting Resin Impregnated Pipe or Tube. For Sliplining, the existing pipe becomes the casing for the HDPE carrier pipe.

A. Water & Sewer Force mains: HDPE pipe shall be extra high molecular weight HDPE

pipe conforming to all applicable AWWA and NSF standards and shall be equal to DriscoPlex 4000/4100 Series as manufactured by Performance Pipe, Chevron Phillips Chemical Company.

B. Gravity Sewer: High density polyethylene pipe shall be extra high molecular weight HDPE PE3408 for gravity sanitary sewer main applications with cell classification 345434C conforming to ASTM D3350 and shall be equal to DriscoPlex 4200/4300 Series as manufactured by Performance Pipe, Chevron Phillips Chemical Company.


For microtunneling, pipe jacking, auger boring and pipe ramming applications, the carrier pipe is installed inside the casing pipe. Carrier pipes that will be considered by the District include:

A. Ductile Iron - Ductile iron (DI) pipe shall meet all requirements of Division 2, Water Installation or Division 3, Sewer Installation as applicable. In addition all DI pipe shall be restrained joint. Rubber gasket restraining systems such as Field-Lock gaskets are not acceptable as restrained joint piping in boring, casing, or carrier pipe installations.

B. Concrete polymer reinforced pipe. C. HDPE as specified above. D. Cured in Place Pipe (CIPP) shall adhere to these referenced standards

ASTM F1216: Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin- Impregnated Tube.

ASTM D5813: Cured-in-Place Thermosetting Resin Sewer Pipe. Inversion Lining.

ASTM D790: Test Methods for Flexural Properties of Non-Reinforced Plastics.

ASTM F1743: Cured in Place Thermosetting Resin Sewer Pipe. Pull In and Inflate.

6-2.050 Fittings Fittings and adapters shall match the pipe material being used. A. For HDPE pipe all fittings and adapters shall be molded and fabricated HDPE compatible

with the specified pipe, referenced standards and manufacturer requirements. All joints shall be butt-fused joints in accordance with referenced standards, and manufacturer requirements and using equipment specifically developed for joint fusions.

B. For DI pipe, all fittings and adapters shall meet all requirements of Division 2 Water or Division 3 Sewer as applicable. In addition, all DI pipe joints and adapters shall be restrained joint and Field-Lock gaskets are not acceptable as restrained joint.

6-2.060 Drilling Fluid Drilling fluid, if used, shall be a slurry mix specifically used for horizontal directional drilling or Microtunneling and shall be biodegradable and non-toxic. 6-2.070 Tracer Wire and Box Tracer wire shall be installed with installations of non-metallic carrier pipe, including open cut installations.

A. Tracer wire shall be installed with the carrier pipe during HDD installations. The tracer wire shall extend from end-to-end of the section being installed in one continuous length without splices. Wires shall be terminated in a traffic rated magnetized tracer box on each end.

B. Tracer wire for HDD installation shall be a 10 AWG solid conductor. Conductor shall be hard-drawn, 21% IACS, copper clad steel, utilizing a AISI 1065 high carbon steel core, with rated break load of 1,940 lbs (238,000 psi). Conductor


shall be extruded with a 45 mil, high density, high molecular weight polyethylene (HMW-HDPE) pursuant to ASTM D1248 standard. Tracer wire shall be PRO-TRACE HDD-CCS PE45 as manufactured by Pro-Line Safety Products or approved equal.

C. Tracer box shall be traffic rated with blue coated locking cast iron cover with direct connect terminal and encapsulated magnet system for amplification. Tracer box shall be SnakePit model RB14*TP as manufactured by Copperhead Industries, LLC, or approved equal. Installation of the tracer box shall be performed per Cast Iron Valve Box detail WD-13.

6-3.000 INSTALLATION 6-3.010 General When approved by the District trenchless methods may be considered an option for the Contractor. When approved by the District, use of HDD shall generally comply with the Horizontal Directional Drilling Manual as published by the North American Society for Trenchless Technology (NASTT) and standard industry requirements. When approved by the District, the use of microtunneling shall generally comply with the Standard Construction Guidelines for Microtunneling as published by the American Society of Civil Engineers (ASCE) and standard industry requirements. When the approved trenchless method includes a casing and carrier pipe, the external void space between the casing and native material shall be filled with grout as specified on the approved plans. The annular void between the carrier pipe and casing shall be filled and the ends sealed off in accordance with District Standard Drawing TI-1. 6-3.020 Trenchless Installation Pipe shall be installed to the lines and grades as shown on the plans and profiles. Because of the minimum pipe slopes and easement width, installation of the pipe shall be closely monitored to maintain the proper alignment. Easements allowed for construction shall be as shown on the plans. All debris caused by construction shall be removed from the premises and legally disposed of. Contractor is liable for damages caused to construction areas from heavy equipment and trucks. Contractor is responsible for restoring area when construction is complete. The equipment used during the drilling operation shall be determined by the Contractor for the approved trenchless method and meeting the requirements of the plans or specifications of this project. The Contractor's drilling equipment shall be equipped with an electrical strike by sensing both current and voltage. The strike system shall be equipped with warning strobes on both the drill frame and the power unit. Contractor shall supply grounding mats for the operator.


Water required for the drilling operation may be obtained from the District if available. If available and the Contractor elects to use, Contractor shall apply to the District for a water use permit and shall furnish backflow prevention equipment according to District Standards. Water use shall follow the latest guidelines in accordance with District policy. Water for drilling operations shall not be used directly from a fire hydrant. The Contractor shall provide a tanker truck for use as a water reservoir for the drilling operation. Contractor shall provide portable fluid (mud) tanks at both entry and exit points to contain all drilling fluids resulting from the drilling operation and is responsible for proper disposal of all drilling fluids and waste tailings offsite unless a suitable location is approved by the District. For HDD installations, the pullback method shall be used to install the water/sewer lines. Once the pullback has begun, it shall be continuous until full completion. Contractor shall make preparations .for extended hours of operation during pullback of piping. Contractor shall maintain a minimum horizontal separation of ten (10) feet between all sewer and water lines except when placed in the same casing. When water main pipe and sewer main pipe need to be installed in the same casing, the installation shall meet the Washington State Department of Health (DOH) separation requirements and may require separation by an additional casing around either the water or sewer within the joint casing. DOH approval is required whenever water and wastewater pipes are proposed to be placed in the same casing. Acceptable horizontal and vertical tolerances vary depending on the trenchless method being used. In general and unless identified in the approved plans: horizontal variances are plus or minus one (1) foot from the plan alignment and vertical variances are plus or minus one-half foot from the elevation centerline or tighter. For gravity sewer carrier lines, pipe shall meet the minimum allowable slope or greater, per Division 3, continuously in the direction of flow. Contractor shall continuously record all measuring and gauging equipment used at all times during operation and pullback of the piping and the District shall have access to these records. Drilling fluids shall be recycled during the drilling operation whenever possible. Contractor shall use every available means to install the pipeline in accordance with the approved plans. This includes sealing and re-drilling all or any part of the pilot hole if the completed or partially completed pilot is not in compliance with the plans. In the event the pipeline becomes lodged and cannot be pulled out of the drilled hole during installation, the Contractor shall seal the pipeline and existing hole and re-drill a pilot hole and pullback the pipeline again. Drilling operations shall minimize impact on the environment. Contractor shall restore jobsite to original condition upon completion of all work activities. The entire length of the trenchless installation shall have a recorded profile upon completion. Information shall be continually recorded throughout the drilling operation by a surface computing system placed behind the bit. Contractor shall furnish this information to the District upon completion of the trenchless method operation. All HDPE pipe shall have butt-fused joints completed in accordance with the manufacturer's recommendations as to equipment and technique by workers who have a demonstrated ability and experience in the fusion process. HDPE pipe shall be butt-fused into the maximum available lengths prior to pulling the pipe into the directional drill hole. Following the joint fusion


process of the HDPE, all interior butt welds shall be reamed to provide the full unobstructed inside diameter of the HDPE pipe for sewer installations. Following installation of the HDPE pipe by the directional boring technique, the pipe shall be allowed to return to its equilibrium length and temperature. No connections, pipe cutting or other work will be allowed on the HDPE pipe for 48 hours following installation. 6-3.030 CIPP Liner Installation- Rehabilitation

The CIPP liner shall be installed and cured in the host pipe per the manufacturer's instructions, following the methods indicated in the materials submitted. CIPP installation shall be in accordance with ASTM F1216, Section 7, or ASTM F1743, Section 6, except as modified herein. Resin Impregnation - The quantity of resin used for tube impregnation shall be sufficient to fill the volume of all voids in the tube material with additional allowances for polymerization shrinkage and the loss of resin through cracks and irregularities in the original pipe wall. The amount of resin used shall exceed the calculated value by ten percent (10%) to fill the voids in the annular between the CIPP and the existing pipe due to the structural deterioration of the existing pipe. The person in charge of the Contractor's wetout process shall submit a signed wetout sheet that shows the quantity of resin that was placed into the fabric tube, and certifies that the information is accurate and the resin was distributed uniformly throughout the fabric tube. A vacuum impregnation process shall be used. To ensure thorough resin saturation throughout the length of the felt tube the level of the vacuum and the speed of the resin advance shall be coordinated so that white spots (dry areas) at the inside surface of the flexible membrane shall be small, shallow, less than 10% of the fabric tube wall thickness or 3-mm, whichever is less, and be less than 1% of the volume of the resin per unit length. A roller system shall be used to uniformly distribute the resin throughout the tube. The roller gap dimension shall be calculated by a method that determines the correct volume of resin/felt per unit length (foot, yard or meter), contained within the confining perimeter of the flexible membrane A gap dimension calculation based on the parameters as diameter, cut size, nominal felt void percentage, nominal resin polymerization shrinkage, the design thickness, and whether the flexible membrane will end up as the ID of the CIPP as with inversion, or the OD as with a pull-in method shall be submitted to the District for approval. If the Contractor uses an alternate method of resin impregnation and resin distribution, the method must produce the same results. The District must approve any alternate resin impregnation method. The wetout tube shall be positioned in the pipeline using either inversion or a pull-in method. If pulled into place, a power winch shall be utilized and care should be exercised not to damage the tube as a result of friction during pull. The tube should be pulled-in or inverted through an existing manhole or approved access point and fully extend to the next designated manhole or termination point. Prior to installation, remote temperature gauges (typically thermocouple probes) shall be placed inside the host pipe at the invert level of each end to monitor the temperatures during the cure cycle. Liner and host pipe interface temperature shall be monitored and logged during cure and cool-down. Curing shall be accomplished by utilizing hot water under hydrostatic pressure in accordance


with the manufacturer's recommended cure schedule. The heat source in and output temperatures shall be monitored and logged during the cure and cool-down cycles. The manufacturer's recommended cure schedule shall be submitted for each line segment installed, and the liner wall thickness and the existing ground conditions with regard to temperature, moisture level, and thermal conductivity of soil, per ASTM F1216, 7.6.1.2 or ASTM F1743, 6.6.1.2 as applicable, shall be taken into account and shown how those factors influence the cure schedule. If a pulling method is used, a cable shall be strung through the existing pipe to be rehabilitated and attached to the liner through an existing manhole or access point. The liner shall be pulled through the existing manhole and through the existing pipe by this cable. Care shall be taken not to damage the existing sewer lines or manholes during the installation. Appropriate sleeves and rollers shall be used to protect the liner.

6-3.040 Cool Down

The Contractor shall cool the CIPP in accordance with the approved manufacturer recommendations. Cooling shall be done without pressure interruption and with either water or

air. When the exterior "skin" (interface) temperature on both ends reaches 100 F and held for the appropriate period of time, the processing shall be finished. The equipment may then be disconnected. Temperatures shall be monitored and recorded throughout the installation process to ensure that each phase of the process is achieved at the approved manufacturer's recommended temperature.

6-3.050 Finish

The finished lining shall be continuous over the entire length of an installation run and be free from visual defects such as foreign inclusions, dry spots, pinholes, and de-lamination. The lining shall be impervious and free of any leakage from the pipe to the surrounding ground or from the ground to inside the lined pipe. Any defect, which will or could affect the structural integrity or strength of the linings, shall be repaired at the Contractor's expense, in a manner approved by the District. The beginning and end of the CIPP shall be sealed to the rehabilitated pipeline. The sealing material shall be compatible with the pipe end and shall provide a watertight seal. 6-3.055 Sliplining Installation- Rehabilitation Sliplining is an acceptable rehabilitation method for sewer and water mains whereas the existing main becomes a casing for a smaller carrier pipe. The District may allow for Sliplining under certain circumstances and only when proposed lines can accommodate final build out flows or demand utilizing a smaller diameter carrier pipe. 6-3.060 Testing and Acceptance Trenchless methods shall be subject to all conditions and requirements of the applicable portions of Division 2-Water and/or Division 3-Sewer.

Alderwood Water & Wastewater District Adopted 4/24/2017 Standards & Guidelines Division 7 – Aggregates. Trenching, Backfill, & Restoration Page 1 of 8

DIVISION 7

Standards

for

Aggregates, Trenching, Backfill,

& Restoration


Division 7

Standards for Aggregates, Trenching, Backfill, & Restoration

Table of Contents 7-1.000 GENERAL ................................................................................................................ 3 7-2.000 AGGREGATES ........................................................................................................ 3 7-2.010 Control Density Fill (CDF) ......................................................................................... 4 7-3.000 TRENCHING AND BACKFILL ................................................................................. 4 7-3.010 General .................................................................................................................... 4 7-3.020 Evaluation of Native Soil ........................................................................................... 5 7-3.030 Installation ................................................................................................................ 6 7-3.040 Frequency of Testing ................................................................................................ 6 7-3.060 Restoration ............................................................................................................... 7 7-3.070 Soil Amendments ..................................................................................................... 7 7-4.000 PERMANENT PAVEMENT REPAIR ........................................................................ 8 DETAILS Trench Section Pipe Bedding and Trench Backfill..…….…….……….………...…...…....…...…..TBR-1 Trench Surface Restoration………………………………………..………………………………….….TBR-2 Unsuitable Foundation Excavation………………...……….…………………….…….………....…....TBR-3 Trench Dams……………….………………..……………….…….……….….…..……….………...….…TBR-4 Concrete Anchor for Pipe in Steep Slopes……………………….…………..……………….…....…TBR-5


7-1.000 GENERAL The Contractor shall complete the installation of all furnished materials in accordance with the Construction Drawings and Standard Details, Specifications and in accordance with all State, District and other local regulatory authority requirements. The more stringent Standard or requirement shall apply unless agreed to by the District. 7-2.000 AGGREGATES A. Foundation Gravel: Comply with Section 9-03.17 of WSDOT Standard Specifications for

Class “A”. B. Bedding Material for Rigid Pipe (DI):

a. Sewer: Bedding shall be classified as pea gravel as shown in “Pea Gravel” this section.

b. Water: Bedding shall comply with Section 9-03.12(3) of WSDOT Standard Specifications.

C. Bedding Material for Flexible Pipe (PVC, HDPE): For all sewer lines, pipe bedding shall be

classified as pea gravel as shown below. For water lines, pipe bedding shall be classified as pea gravel as shown below, or Section 9-03.13 of WSDOT Standard Specifications as required by the District.

D. Bedding Material for Copper Tubing: Shall be classified as clean, rock free sand. E. Bank Run Gravel for Trench Backfill: Bank run gravel for trench backfill material shall

conform to Section 9-03.19 of the WSDOT Standard Specifications. F. Pea Gravel: Bedding shall consist of screened sand, gravel or other inert materials, or

combinations thereof, from sources approved by the District, and shall have hard, strong, durable particles free from adherent coatings. The material shall be washed thoroughly to remove clay, loam, alkali, organic matter, or other deleterious substances and shall meet the flowing test requirements.

Sieve Size Percent Passing

3/4” 100%

3/8” 80-100%

#8 0-10%

#200 0-3%

G. Recycled Concrete: Recycled concrete products will typically not be allowed in District utility

trench lines. Request to use recycled concrete shall include corrosivity/resistivity testing results, gradation of material proposed and compaction testing procedures must comply with District standards. Where significant ground water is present or above metallic pipe lines, the use of recycled concrete products is highly unlikely. Prior approval of use is required from the District and the jurisdictional authority.


H. Recycled Hot Mix Asphalt (HMA): Recycled HMA may be allowed as hot patch subgrade (not entire trench backfill) only if gradation and material, including compaction testing procedures comply with District standards. Prior approval of use is required from the District and the jurisdictional authority. Reuse of cold mix will not be allowed.

7-2.010 Control Density Fill (CDF) CDF is a self compacting, cementitious, flowable material requiring no subsequent vibration or tamping to achieve consolidation. CDF shall be designed to have minimum 28-day strength of 50 psi and maximum 28-day strength not to exceed 300 psi. The CDF consistency shall be flowable (approximate slump 3 to 10 inches). A sample mix design can be found in Snohomish County’s EDDS, Chapter 8, section 7. For protection of metallic pipes beneath CDF refer to standard 7-03.070 (f) of this section. 7-3.000 TRENCHING AND BACKFILL 7-3.010 General The following trenching and backfill specifications and requirements apply to all water and sewer utility installations within the District. These standards represent the minimum requirements. Jurisdictional or other requirements shall apply in all cases when those standards and requirements exceed these minimums. The location of the pipe shall be shown on the Construction Drawings and field adjusted as approved by the District. During trenching, installation of pipelines and appurtenances and the placing of backfill, the trenches shall be kept free of water. The Contractor shall furnish all equipment necessary to dewater the trench and shall dispose of the water in such a manner as not to cause a nuisance or menace to the public and in accordance with State and local jurisdictional requirements. All trench excavations shall have adequate safety systems for the trench excavation that meet the requirements of the Washington Industrial Safety and Health Act, Chapter 49.17 RCW. The Contractor shall be fully responsible for providing the necessary back sloping, shoring, cribbing, trench boxes, etc., as required to meet the specific safety requirements for the trench. The Contractor’s attention is called to the depth of the structures and pipe which may require special shoring and bracing. The Contractor shall furnish all shoring and bracing or sheeting required to perform and protect the trench and to safeguard the workers. The Contractor shall follow all Federal and State regulations for trenching and backfill. No timber bracing, lagging, sheathing or other lumber shall be left in any excavation. The volume excavated that will be displaced by the pipe, bedding material and backfill shall be loaded, hauled and disposed of in a manner selected by the Contractor and approved by Snohomish County or other agency having jurisdiction. The Contractor shall be responsible for obtaining any City, County, State or other agency permits for such disposal sites and shall pay all fees and charges associated therewith. Trench backfill material above the piping and bedding material shall be bank run gravel or select native material. Material shall require approval by the Contractor’s geotechnical consultant and the District prior to using. Excavation and backfill compaction shall be performed in accordance


with standard construction practices to achieve the required compaction. Compaction and acceptance shall be subject to approval of the jurisdictional authority and the District. Backfill compaction shall occur in sufficiently thin lifts to achieve the density requirements specified. Such compaction shall be performed to within 6-inches of existing road grade. In areas of existing pavement, after placing a tack coat on the existing asphalt edges, the final patch shall be constructed in accordance with Standard Detail TBR-2 using a minimum of 6-inches of hot mix asphalt (HMA) class ½ or ¾ inch, or 4-inches of HMA class 1 inch and 2-inches of HMA class ½ or ¾ inch placed in the trench up to finished grade or in accordance with jurisdictional requirements and whichever is more stringent shall apply. Where the undisturbed conditions of natural soils are inadequate for support of the planned construction, excavation shall be extended 8-inches minimum below the structure or pipeline grades to permit the placing and compacting of foundation gravel. All natural soils inadequate for support of planned construction shall be removed to the depth of natural soils adequate for support. Trench cross-sectional width shall conform to the trench details shown on the Construction Drawings and Standard Details. Trench dams shall be installed across the entire trench section and to the full depth of all granular backfill materials in all areas where excessive amounts of water can enter and follow the trench line including steep slopes, stream and wetlands crossings and as determined by the District and other local governmental authorities. See Standard Detail TBR-4 in Division 7. Testing frequency shall comply with section 7-3.040. Areas that fail to pass testing shall require retesting at locations determined by the District. 7-3.020 Evaluation of Native Soil The Contractor’s geotechnical consultant shall complete a thorough evaluation of native soil. Soil evaluations, sieve analysis and proctor tests shall be completed prior to and during construction for varying soil conditions as determined by the geotechnical consultant. The geotechnical consultant shall verify that material can achieve compaction under varying weather conditions. At any time native materials are determined to be unsuitable to obtain compaction or do not meet specified gradation, imported materials shall be provided in accordance with the specifications. Material source shall be provided and approved by the District. All acceptance tests shall be conducted from in-place samples. Compaction testing shall be accomplished using a nuclear densometer. Compaction testing results sent to the District shall include a copy of the material proctor results and the precise location of area tested by referencing the horizontal and vertical location on Construction Drawings. Metallic pipe installed through sewer drain fields, live or abandoned, is required to be protected against corrosion. For protection of metallic pipes in these areas, refer to standard 7-03.070 (f) of this section.


7-3.030 Installation Prior to excavation and installation, equipment capable of achieving adequate compaction shall be on site. Backfill and compaction shall be completed in conjunction with the pipeline installation. Prior to the District accepting the water and/or sewer mains for use and operation, compaction testing showing adequate compaction shall be verified by the District. The District highly recommends that compaction testing be completed in conjunction with the installation of backfill and compaction. Copies of compaction testing, reports, soils analysis and proctor tests shall be provided to the District to verify compaction requirements prior to pressure testing. A. Utility Trenches in the Existing Right-of-Way: Trench backfill material and compaction shall

conform to the jurisdictional requirements of the Entity/Owner of the existing right-of-way or follow the District Standards, and whichever is more stringent shall apply.

B. Utility Trenches in Proposed or Existing Traffic Areas, including Driveways Easements: All

trench backfill shall be mechanically compacted to 95 percent of maximum density in accordance with ASTM 1557 (modified proctor).

C. Utility Trenches in Non-Paved, Non-Structured Areas and Designated Wetlands: All trench

backfill shall be mechanically compacted to 90 percent of maximum density in accordance with ASTM 1557 (modified proctor). Compaction testing as specified in Section 2-03.3(14) D of the WSDOT/APWA Specifications and as specified by the local jurisdiction, shall be required.

D. Utility Trenches in Areas Near Structures: Existing and proposed structures located within a

1:1 slope from bottom of the trench excavation to the projection of the slope to finished grade shall be deemed as lying in the “Zone of Influence” of the excavation and the trench in the easement area within the zone of influence shall be backfilled with flowable CDF from the top of bedding to a depth that the structure is outside the zone of influence.

E. Utility Trenches Under Existing Water Mains: Additional care must be taken when excavating around existing water pipe lines under pressure. Pipes must be supported during excavation adequately to prevent failure, sag, or breakage within the area of the new trench line. Existing cast iron pipe lines must have the trench below the pipe backfilled with flowable CDF to prevent future shear. Wrap the cast iron line in plastic sheeting with a minimum thickness of 8 millimeters and fill trench line to bottom of pipe but no higher than spring line.

7-3.040 Frequency of Testing A. Horizontally: Minimum of two locations every 200 feet of trench, or a minimum of two

locations per day or a minimum of 2 locations per pipe run between manholes and/or valves whichever is more frequent shall apply. Additional tests may be required when variations occur due to the Contractors operations, weather conditions, site conditions, etc.

B. Vertical testing shall use the deepest portion of the trench line to determine minimum testing

depths as follows


For trenches 12-feet and under; complete a minimum of one test at approximately one half of the trench depth and an additional test at or near the surface For trenches 12-feet to 16-feet deep; complete one test at approximately 4-feet above the pipe, one test at or near the surface and one test approximately halfway in between. For trenches greater than 16-feet deep; complete tests at approximately four foot intervals above the pipe to the surface (four tests required) or as directed by the District. Structured areas, such as an easement near a building, shall require additional testing in the zone of influence from the licensed geotechnical consultant such that the compaction shall not adversely affect the nearby or surrounding structures. If compaction does not meet the minimum standards required, additional excavation and testing as directed by the District shall be completed. The District reserves the right to require additional testing in areas that are questionable. Compaction testing costs are the responsibility of the Contractor. Copies of all testing reports shall be provided to the District for verification and project records and jurisdictional approvals.

7-3.060 Restoration The Contractor shall prepare and restore all test sites with his own equipment, labor and materials. All costs incidental to the preparation and restoration of all test sites shall be at the Contractor’s expense. The Contractor shall remedy, at his expense, any defects that appear in the backfill prior to final acceptance of the work. Upon completion of work each day, all open trenches shall be completely backfilled and leveled. In paved areas, temporarily patch with 3 inches of cold mix asphalt concrete (or as specified by the regulatory authority) except in areas designated for Control Density Fill (CDF). Where CDF is used it shall be placed in accordance with the jurisdictional authority. Trenches not backfilled at the end of the day may be covered with steel plates or other materials providing safety and protection for the public and as approved by the jurisdictional authority. Prior to placing CDF over ductile iron pipe or fittings, the pipe bedding material around the pipe shall be placed and compacted. 7-3.070 Soil Amendments Use of soil amendments in District utility trenches shall be approved by the District prior to placement. The District reserves the right to deny use of soil amendments at the District’s discretion. Soil amendments used without prior approval from the District shall be removed at the Contractor’s cost. Amendments to soil such as kiln dust will be considered by the District if:

a. The recommendation is made by the Contractor’s geotechnical consultant. b. The amendment shall be used the entire trench depth. (Bridging lower portions of trench

line shall not be allowed). c. The metallic pipes shall be wrapped using American V-Bio Poly Encasement or equal

and the pipes bedded (covered) with 6” of untreated material under the amended soils or CDF and in areas of abandoned or live sewer drain fields.


d. The geotechnical consultant verifies the proposal complies with the jurisdictional authority requirements if applicable.

e. The Contractor takes full responsibility for any impacts placed on surrounding areas.

f. Results of a corrosivity/resistivity test on native soil with the proposed amendment ratio are provided to the District. Results of this test may require additional measures to protect metallic pipes from corrosion such as cathodic protection.

If amendments are approved by the District, the geotechnical consultant shall witness and document the mixture of the additive. Compaction tests that meet these standards shall be required at the frequency and depths specified. Quarry spall and fabric are not an approved soil amendment. 7-4.000 PERMANENT PAVEMENT REPAIR Pavement repair shall follow the governing jurisdictional authority when in the right-of-way. The District’s standards are to be followed in the easements. Where Standards differ, the most stringent shall apply as determined by the District. A. Asphalt Concrete Pavement Repair. Asphalt concrete pavement repair shall be asphaltic

concrete pavement HMA class ½ or ¾ and shall conform and be placed in accordance with the requirements of Section 4-06 and 5-04 WSDOT. Before pavement is placed, all edges and joints of asphaltic concrete pavement shall be tacked with:

1. Asphalt Sealer SS 1 or equal.

2. After pavement is in place, all joints shall be sealed with hot asphalt cement, AR 4000 Grade and sand placed on sealant to prevent tracking by vehicles.