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JDWWTP Aeration Basin and Digester Basin Grit Removal RFQ No. E12-181

REQUEST for QUOTES (RFQ)

Juneau Douglas Wastewater Treatment Plant

Aeration & Digester Basin Grit Removal RFQ No. E12-181

QUOTES ARE DUE PRIOR TO 2:00 p.m., December 22, 2011

RESPONDING TO THIS REQUEST FOR QUOTES. Quotes may be hand-delivered, or faxed, to the attention of Tina Brown, CBJ Engineering, Contracts Office, 3rd Floor, Marine View Center at 230 South Franklin Street. The Engineering Department Contracts Division fax number is 907-586-4530. Emailed quotes will be accepted if they are emailed to [email protected], received and printed prior to the deadline stated above. It is strongly recommended that Bidders call (907) 586-0490 to confirm receipt of faxed or emailed quotes.

BACKGROUND. The CBJ’s Juneau Douglas Wastewater Treatment Plant (JDWWTP) utilizes the activated sludge biological treatment process to treat wastewater originating from the downtown Juneau and nearby Douglas Island areas. This project will consist of removing accumulated grit comprised of sand and organic material from the facility’s aeration basin #2 and digester basin (Base Bid) and aeration basin #1 (Additive Alternate), and moving the material to the facility’s ash disposal pond. A facility site plan is included at the end of this RFQ document.

SCOPE OF WORK. The Contractor shall provide all labor, equipment, and materials and perform the Work under this contract.

Grit removal methods may consist of hand or light equipment excavation, hydraulic dredging, trash slurry pumping or other means. All grit shall be removed to within 1/8” of the concrete floor in each basin and will be disposed onsite in the ash disposal pond.

See the following attachments for additional information about the JDWWTP and this project:

• Attachment A – Selected Design Drawings showing the aeration and digester basins. • Attachment B – Ash Pond Closure Plan and Permit presents the permit for onsite disposal

of the grit. The closure plan includes laboratory test results of the material properties of the grit material.

Work Plan: The JDWWTP will remain in operation during the contract and the Contractor is required to coordinate its activities to minimize negative impacts on the day to day operations of the plant. Coordination measures will include but are not limited to:

• Preparation of the Contractor’s proposed work plan for review and approval by the utility prior to beginning work. The work plan shall note the Contractors proposed grit removal methods, schedule, and safety plan for the work.

• Provide sufficient staff and equipment to ensure that no individual aeration basin is out of service for more than 10 consecutive days. For work on the digester basin, ensure that it is out of service for no more than 7 consecutive days.


• Protecting existing structures. Any damages caused by the Contractor’s activities shall be

rapidly repaired at the Contractor’s expense.

Process water for the basin cleaning will be provided via a single fire hydrant equipped with a 2 ½” meter & backflow prevention device provided by the city. The Contractor shall provide any necessary hoses beyond the meter & backflow prevention device. Water usage fees will be paid by CBJ.

The aeration and digester basins are located within buildings and Contractors are advised to visit the site and become familiar with building access locations prior to submitting bids.

If the Contractor elects to remove the grit by excavation, CBJ wastewater staff will remove the majority of water from each basin prior to the beginning of work and the Contractor will then be responsible for the removal of any additional water during its grit removal process.

If the Contractor elects to remove the grit by hydraulic dredging, trash pumps, or similar methods, CBJ wastewater staff will draw the basin down to the level specified in the Contractor’s work plan prior to the start of work. The Contractor will then be responsible maintaining the working water level in the basin until its work is completed. All outflow lines from dredging/trash pump, or similar equipment, will be extended to the ash pond. Any excess water that accumulates in the ash pond will be returned to the plant by plant staff.

Pay Items Base Bid – Aeration Basin #2 and Digester Basin Grit Removal: Remove approximately 1,200 cubic yards of grit material from Aeration Basin #2 and approximately 600 cubic yards from the Digester Basin. Additive Alternative – Aeration Basin #1 Grit Removal: Remove approximately 1,200 cubic yards of grit removal from Digester Basin.

Award Award will be made for the Base Bid and Additive Alternate if the total low bid for the combined work is below the available budget of $50,000. If all Base Bid and Additive Alternate work cannot be done within the $50,000 limit, only the Base Bid will be awarded under this RFQ. LOCATION OF THE PROJECT. The Project location is the JDWWTP at 1540 Thane Road in Juneau, Alaska. COMPLETION TIME FOR THE WORK. The Contractor shall have until March 31, 2012, to complete all Work as described. PRE-BID SITE INSPECTION. Bidders are encouraged to visit the Project site prior to submitting a bid for this Work. A pre-bid site inspection visit is scheduled for December 20, 2011 at 1p.m. One of the basins will be partially dewatered for the visit to allow visual inspection of the basin and grit conditions. Failure to visit the site shall in no way relieve the Contractor of its responsibility to perform the Work in compliance with the terms and specifications of this Contract. QUALITY OF WORK. The Contractor shall employ workers and craftspeople qualified in the necessary trades. All Work shall conform to industry standards and practices. The Contractor shall be responsible for the supervision and control of all Work; the safety of the workers; and assurance that the quality of Work and character of workers conform to all applicable laws and regulations. QUALIFICATIONS. By submitting a quote the Contractor warrants that it is qualified to perform the Work described in accordance with all applicable codes, standards, and regulations. The Contractor shall, upon request by the CBJ, provide all documentation showing the Contractor’s qualifications and/or registrations necessary for completion of the Project.


QUOTES. A Quote for the Work will not be accepted from a Contractor who does not hold a valid Alaska Business License and a valid Contractor’s license in Alaska (applicable to the type of Work bid upon) at the time of opening Bids. The CBJ’s procurement code requires that Request for Quotes be used for projects estimated to not exceed $50,000.00 in total cost. If a quote is submitted for an amount exceeding $50,000.00 for the Base Bid, it shall be considered non-responsive. If combined cost of the Base Bid and Additive Alternate portion of this quote exceed $50,000, then the Additive Alternative price quote will be considered non-responsive. CONTRACTOR’S RESPONSIBILITIES. The Contractor shall designate a Project Superintendent, or designee, who shall serve as the Contractor’s point of contact and be in full charge of the Work, ensuring that the work is performed in a safe and professional manner. Unless otherwise approved in writing by the Owner’s Project Representative, the Project Superintendent shall acknowledge and accept, on behalf of the Contractor, all written change orders, directives, approval, or rejection notices. The Contractor shall have sole responsibility for the means, methods, sequences, or procedures of construction and safety precautions related thereto. The Contractor shall conduct all Work in such a manner as to protect CBJ resources. The Contractor shall comply with all applicable laws, regulations, codes, and ordinances. In addition, the Contractor shall obtain applicable licenses and permits, unless directed otherwise; provide supervision, labor, tools and new materials, unless directed otherwise. PERMITS. The CBJ has obtained the necessary permits for placement of the grit material in the facility’s ash disposal pond. SUBCONTRACTING. The Contractor shall not subcontract any part of this Work required herein, without prior approval in writing from the CBJ Engineering Department, and notification to the State of Alaska Department of Labor. If this project will have subcontractors, the Contractor will be responsible to submit a list of Subcontractors who will be working on the project (form attached to the end of this RFQ), and to comply with Alaska Employment Security Act. This request is for tax liability clearance with the State of Alaska, Department of Labor. The Employment Security Tax Clearance form will be issued with the Notice to Proceed. CANCELLATION. The CBJ, as Owner, reserves the sole right to cancel this Contract, in whole or in part, immediately, in the event of the Contractor’s failure to perform the Work in conformance with these Contract Documents. CONTRACT ADMINISTRATION AND ACCEPTANCE. The CBJ, through its authorized representative, will perform the Contract Administration and Inspection for this Work. The CBJ reserves the right to determine the acceptability of the finished Project. Should the Contractor fail to meet the required specifications, the Contractor shall immediately complete the Project as specified, at no additional cost to the CBJ. COMPENSATION. The Contractor shall be paid on a lump sum basis upon satisfactory completion and acceptance of the Work by the CBJ and notification by the State Department of Labor that the Contractor has complied with its requirements. LIABILITY AND INSURANCE REQUIREMENTS. This section shall be included by addendum.


QUESTIONS CONCERNING THE WORK. Contact Jennifer Mannix, Contract Administrator at 907-586-0873, or email: [email protected]. FINAL PAYMENT. Prior to final payment of the final 5% of this contract, the Contractor must submit the following documents:

1. Employment Security Tax Clearance for the Contractor and each Subcontractor from Alaska Department of Labor, Juneau Field Tax Office – (form to be provided with Notice to Proceed)

2. Compliance Certificate and Release Form – (form to be provided with Notice to Proceed)

AS-BUILT PLANS. This request for bids include a portion the original design drawings for the JDWWTP as as-built plans. As-built plans are prepared from the best available information; however, the plans may not reflect actual utility locations. The Contractor is responsible for verifying the accuracy of the as-built plans and the CBJ is not responsible for costs incurred by the Contractor due to any discrepancy in the as-built plans. SITE MAP/DRAWINGS A site map is included below. The following drawings are attached and included with this RFQ: Drawing Labeled No. 7 - Aeration Basins Structural – Mechanical Drawing Labeled No. 8 – Aeration Basins Structural – Architectural Drawing Labeled No. 12 – Digester Structural – Mechanical Drawing Labeled No. 13 – Digester Structural – Architectural


BID SCHEDULE AND SIGNATURE PAGE

PROJECT: JDWWTP Aeration Basin and Digester Basin Grit Removal – RFQ E12-181

Give number and date of each Addendum issued. Failure to acknowledge receipt of all Addenda may cause the Quote to be non-responsive and may cause its rejection.

Addendum No. Date Issued Addendum No. Date Issued

Dated: Bidder: (Company Name) By: (Signature in ink) Printed Name: Title: Phone: Address: (Street or P.O. Box) Fax: (City/State and Zip Code) Email:

Furnish all labor, equipment, and materials for the in accordance with these RFQ documents.

COMPLETION TIME FOR THE WORK. The Contractor shall have until March 31, 2012, to complete all Work as described.

Base Bid – Aeration Basin #2 and Digester Basin Grit Removal: Remove approximately 1,200 cubic yards of grit material from Aeration Basin #2 and approximately 600 cubic yards from Digester Basin.

$ _______________________ (Price in Figures)

Additive Alternative – Aeration Basin #1 Grit Removal: Remove approximately 1,200 cubic yards of grit removal from Aeration Basin #1.

$ _______________________ (Price in Figures)


Standard Terms and Conditions Examination of Quote Documents: Each bidder shall thoroughly examine and be familiar with all the documents and any addenda to those documents. The submission of an Quote shall constitute an acknowledgment that the bidder has thoroughly examined and is familiar with the Request For Quote (RFQ) documents. The failure or neglect of a bidder to receive or examine any of the Quote documents shall in no way relieve that bidder from any obligations with respect to that bidder's proposal, or to the contract. Misinterpretation or a claimed lack of knowledge concerning the Quote will not serve as a basis for a claim for additional compensation. Interpretation of Quote Documents: Comments concerning defects, questionable or objectionable material and requests for interpretation must be made in writing and received by the CBJ Engineering Department, Contracts Office. If required, amendments to the Quote documents will be in the form of an addenda and, when issued, will be sent as promptly as is practical to all parties to whom the RFQ documents have been issued. All such addenda shall become part of the contract. Request must be sent to the CBJ Engineering Department, Contracts Office, 155 South Seward Street, Juneau, Alaska 99801. Preparation of Quote: Quote must be submitted on the RFQ forms provided, or copies thereof, and be completed in all respects as required by the RFQ documents. Each Quote shall include all information requested, and be manually signed in ink. Addenda: Each Quote shall include acknowledgment in the space provided (Item 2), in the RFQ form, receipt of all addenda issued during the bidding period. Failure to acknowledge all addenda may result in the proposal being rejected as not responsive. It shall be the bidder's responsibility to inquire about addenda issued. Qualification of Bidders: Each bidder shall be skilled and regularly engaged in the general class or type of work called for under the contract. If requested by the CBJ Engineering Department, the low bidder shall submit resumes, documentation or information explaining, illustrating, or demonstrating the experience of the firm, and its key personnel who will be assigned to this contract. Specifications: Unless otherwise specified in the RFQ, product brand names or model numbers specified in this RFQ are examples of the type and quality of product required, and are not statements of preference. If the specifications describing an item conflict with a brand name or model number describing the item, the specifications govern. Reference to brand name or number does not preclude an offer of a comparable or better product, if full specifications and descriptive literature is provided for the product. Failure to provide such specifications and descriptive literature may be cause for rejection of the offer. Quote Prices: The bid prices shall include everything necessary for the fulfillment of the contract, including, but not limited to, furnishing all materials, equipment and labor, except as may be provided otherwise in the contract documents. Price bid must be in U.S. Funds. Additional Units on RFQ Award: The CBJ may from time to time request additional units above the amount stated in the RFQ, realizing that additional orders constituting more than 25% of the amount stated in the RFQ would be with the concurrence of the Contractor. Extension of Prices: In case of error in the extension of prices in the Quote, the unit prices will govern; in a lot bid, the lot prices will govern. Firm Offer: For the purpose of award, offers made in accordance with this RFQ must be held firm for a period of ninety (90) days from the date of RFQ opening. Contract Extensions: Unless otherwise provided in the RFQ, the CBJ and successful bidder/Contractor agrees: (1) that any holding over of the contract excluding any exercised renewal options, will be

considered as a month-to-month extension, and all other terms and conditions shall remain in full force and effect, and (2) to provide written notice to the other party of the intent to cancel such month-to-month extension. Default: In case of default by the Contractor, for any reason whatsoever, the CBJ may procure the goods or services from another source and hold the Contractor responsible for any resulting excess cost and may seek other remedies under law or equity. Billing Instructions: Except as specifically allowed under the RFQ, invoices must be billed to the Engineering Department, as noted on the purchase order. The ordering agency will approve for payment after it receives the merchandise or service and all conditions of the RFQ have been met. Equal Employment Opportunity: The CBJ is an affirmative action purchaser and encourages small and disadvantaged businesses to submit bids.

Rejection of Quotes: The CBJ reserves the right to reject any or all bids and to determine which bid, if any, should be accepted in the best interest of the CBJ. The CBJ reserves the right to waive any Informality in a quote. Fax Disclaimer: It is the responsibility of the bidder to respond in a timely manner. Bidders' use of a facsimile machine shall be at bidders' sole risk. The CBJ will attempt to keep the facsimile machine in good working order but will not be responsible for bids that are late due to mechanical failure, a busy facsimile machine, or any other cause arising from bidders' use of a facsimile machine even if bidder submits a transmission report or provides other confirmation indicating that the bidder transmitted a bid before the submittal deadline. Bidders are therefore strongly encouraged to confirm receipt of their bid with the CBJ prior to submittal deadline. INDEMNIFICATION: Contractor agrees to defend, indemnify, and hold harmless CBJ, its employees, volunteers, consultants, and insurers, with respect to any action, claim, or lawsuit arising out of the Contractor’s performance of this contract, without limitation as to the amount of fees, and without limitation as to any damages resulting from settlement, judgment, or verdict, and includes the award of any attorneys fees even if in excess of Alaska Civil Rule 82. This indemnification agreement applies to the fullest extent permitted by law and is in full force and effect whenever and wherever any action, claim, or lawsuit is initiated, filed, or otherwise brought against CBJ relating to this contract. The obligations of Contractor arise immediately upon actual or constructive notice of any action, claim, or lawsuit. CBJ shall notify Contractor in a timely manner of the need for indemnification, but such notice is not a condition precedent to Contractor’s obligations and may be waived where the Contractor has actual notice. JUNEAU BUSINESS SALES AND PERSONAL PROPERTY TAX: Vendors/merchants conducting business within the City are required by law to register with, and periodically report to, the City for sales and property taxes. Vendors/merchants must be in good standing with the City prior to award, and prior to any contract renewal and in any event no later than five business days following notification by the City of intent to award or renew. Good standing means: all amounts owed to the City are paid in full, including Confession of Judgments; and vendor/merchant is current in reporting (sales tax filings, business personal property declarations). Failure to meet these requirements, if so subject, shall be cause for rejection of your proposal and/or contract renewal. To determine if your business is in good standing, or for further information, contact the City Finance Department’s Sales Tax Division, at (907) 586-5265, concerning sales tax and/or Treasury Division, at (907) 586-5268, concerning business personal property and real property tax.


LIST OF SUBCONTRACTORS (AS 36.30.115)

RFQ E12-181 Juneau Douglas Wastewater Treatment Plant Aeration Basin and Digester Basin Grit Removal

1 AK Contractor

SUBCONTRACTOR License No. 1 Contact Name Type of Contract DBE? ADDRESS 2 AK Business 2 Phone Number Work Amount 1. 1 $ 2

2. 1 $ 2

3. 1 $ 2

4. 1 $ 2

I certify that the above listed Alaska Business License(s) and CONTRACTOR Registration(s), if applicable, were valid at the time Bids were opened for this Project. CONTRACTOR, Authorized Signature CONTRACTOR, Printed Name

-/\:i-r (j\\)r r SEAN PARNELL. GOVERNOR

‘%)) U L1—\\ U L U Lr\LLr’\’) U \\Lr\ 41 0 Willoughby Avenue, Suite 303P.O. Box 111800Juneau, AK 99811-1800

DEPT. OF ENVIRONMENTAL CONSERVATION PHONE: (907) 465-5353

DIVISION OF ENVIRONMENTAL HEALTH

___________

SOLID WASTE AND PESTICIDES PROGRAM [email protected]

November 29, 201 1 CERTIFIED MAll # 7003 0500 0004 7871 1034RETURN RECEIPT REQUESTED

Nathan McCombs, QA ManagerCBJ Wastewater Utility2009 Radcliffe RoadJuneau, Alaska 99801

Subject: Approval ofCity & Borough ofJuneau Incinerator Ash Disposal Pond MonofillClosure Plan at Juneau-Douglas Wastewater Treatment Plant under Solid WastePermit No. SWZAO13-012

Dear Mr. McCombs:

The Department of Environmental Conservation Solid Waste Program (ADEC) has reviewed andapproves your City & Borough ofJuneau Incinerator Ash Disposal Pond Monofill Closure Plan atJuneau-Douglas Wastewater Treatment Plant (JDWWTP) under Solid Waste Permit No. SWZAO13-012, dated November 28, 2011. The plan involves the encapsulation ofapproximately 1,500 cubic yardsof sand/grit from the JDWWTP aeration basins and sludge digester and berm material from the biosolidsmonofill with a sufficient layer ofvibratory compacted incinerator ash on the bottom, sidewalls and topof the waste to limit water from entering or leaving the waste. The ash needed to make up thisinfiltration layer should be available on site. The infiltration layer will be covered by a geotextile filterfabric followed by imported clean backfill and D-1 material that will be graded to prevent ponding andpromote run-off of water. The final surface is intended to provide a storage area for equipment.

The closure plan should be carried out at a time when local precipitation is low in order to alloweffective compaction/encapsulation and placement ofwaste and fill. Any ponded water within the fillshould be extracted during the closure operation.

As-Built drawings with photos ofthe closure should be provided after the closure is complete. We areavailable to inspect the operation as our office is in Juneau. Please feel free to contact me at the aboveaddress if you have any questions.

Sincerely,

Ed EmswilerADEC Solid Waste Program, Juneau

cc: Tom Trego, CBJ Wastewater Utility SuperintendentJim Heumann, CBJ Public Works EngineerJim Dom, Carson-Dom Inc.Doug Buteyn, ADEC, Fairbanks

Solid Waste Permit No. SWZA013-012 JDWWTP Solid Waste Permit

Closure Plan for Ash Disposal Pond Portion of Permit November 22, 2011

Page 1 of 8

1.0 Introduction The City and Borough of Juneau’s (CBJ’s) Juneau Douglas Wastewater Treatment Plant (JDWWTP) is permitted to dispose of solid waste in the facility’s Incinerator Ash Disposal Pond and its Sewage Solids Monofill. Both Monofills are located within the fenced boundary of the plant. The CBJ intends to officially close the Incinerator Ash Disposal Pond to any future ash disposal activities in accordance with 18 AAC 60.460 for Inert Waste Monofills and 18 AAC 60.490 Closure Demonstration and Post-Closure Care. The Incinerator Ash Pond was previously used to dispose of inert incinerator ash generated during the operation of the city’s municipal sewage sludge incinerator between 1993 and September 2010 The CBJ stopped operating the incinerator in 2010 and is in the process of decommissioning it. The CBJ occasionally parks city vehicles and equipment at the plant site and the planned future use for the Ash Disposal Pond area is to provide additional surface storage area for parking vehicles and equipment. The facility’s Sewage Solids Monofill is used for disposal of waste material (grit, sand gravel and solids) collected from the CBJ's waste water collection system drop inlets, manholes, lines and sewer lift stations with vacuum jet trucks and is transported to the plant. The CBJ does not propose to close the Sewage Solids Monofill at this time. The JDWWTP was constructed in 1973 on the site of the former AJ Rock Dump on the Gastineau Channel side of Thane Road, approximately two miles south of Juneau, Alaska. The address for the JDWWTP is 1540 Thane Road, Juneau Alaska. It is within a portion of Section 25, T.41S, R.67E, Copper River Meridian, 58º 17’ 2” N, 134º 23’ 13” W. The plant treats wastewater originating from downtown Juneau and a portion of Douglas Island. The CBJ’s intent is to complete the closure of the Incinerator Ash Disposal Pond by May 2012 and the following sections outline the proposed site closure process.

2.0 Existing Site Conditions The Incinerator Ash Disposal Pond is currently configured as an ash settling pond measuring approximately 185' long x 155' wide x approximately 6' deep and has around 6,400 cubic yards of remaining capacity (See Figure 1, Ash Pond Closure Site Plan).

jldorn

Rectangle

Solid Waste Permit No. SWZA013-012 Closure Plan for Ash Disposal Pond Portion of Permit

Page 2 of 8

When the incinerator was in operation, slurry originating from the incinerator's venturi and impingement tray exhaust air scrubbers was pumped into the pond where the grit and fine ash components would then settle out. The grit and ash mixture is very fine grained and essentially sealed the bottom of the pond with a layer of low permeability material. The remaining supernatant was then directed back to the plant where it was processed in accordance with the facility’s National Pollutant Discharge Elimination System (NPDES) permit. The pond’s water surface elevation was controlled with adjustable weirs located on its north side. Photo 1 shows the current condition of the incinerator ash disposal pond.

Photo 1 Incinerator Ash Disposal Pond Current Condition

Accumulated incinerator ash was previously excavated from the ash disposal pond in 2010 and was trucked to the Capital City Landfill for use as landfill cover material. Representative samples of the material were submitted for laboratory testing and ADEC approval prior to removal from the plant site and were confirmed acceptable for transport and disposal at the receiving landfill.


Page 3 of 8

Photo 2 shows an aerial view of the ash pond and sewage solids Monofill at plant:

Photo 2 JDWWTP Aerial View

The current water level in the pond is at about elevation 30' and does not appear to be impacted by tidal action. The water level is perched well above the water table which was measured in nearby soil test holes at about elevation 13’. Three monitoring wells were installed between the incinerator ash pond and Gastineau Channel during construction of the pond. These wells are 10’ deep and the bottom of each well is at about elevation 26’. This well bottom elevation is about 8’ below the pond water surface when it was in operation and about 4’ below the current water level in the pond. These wells are usually monitored quarterly, but no water has ever been observed in the wells.

Incinerator Ash Pond

Sewage Solids Monofill


Page 4 of 8

Photo 3 shows the pond’s existing overflow/supernatant return structure with the adjustable weirs.

Photo 3 Incinerator Ash Pond Overflow/Supernatant Return Structure

3.0 Closure Plan

3.1 Fill and Grade Existing Pond In order to convert the existing ash pond into an uplands area the CBJ will need to fill the pond to and crown the surface so that the site sheds precipitation. We propose to fill the pond as follows: Step 1 Pump water that has accumulated in the pond to the JDWWTP plant

headworks for treatment and disposal in accordance with the NPDES permit for the plant.

Overflow/Supernatant Return with adjustable

weirs


Page 5 of 8

Step 2 Grade and compact 12-inch uniform incinerator ash layer on the bottom and sidewalls of pond in order to serve as a sealing layer for the pond.

Step 3 Transfer approximately 1,500 cubic yards of sand and grit that has

accumulated in the JDWWTP’s aeration basins and sludge digester over the last 20 years to the ash pond. The aeration basins and the sludge digester have mechanical surface aerators that allow fine sediment and sand to settle in quiescent corners of the basins. This material has been tested (see attached laboratory tests) with results indicating that there are no contaminates in concentrations that would be an issue to using the material to fill the pond. The accumulated sand and grit contains approximately 95% inert solids material.

Step 4 Any supernatant or rainwater in the incinerator ash pond that has

accumulated during transfer of the aeration basin and digester sand and grit will be returned to the JDWWTP plant headworks for treatment and disposal in accordance with the NPDES permit for the plant.

Step 5 Grade and compact aeration basin and digester sand and grit to create a

fairly uniform surface. Step 6 Cover aeration basin and digester sand and grit with biosolids monofill

berm material. Grade and compact to a fairly uniform surface. Step 7 Cover biosolids monofill berm material with stockpiled incinerator ash

to create a relatively impervious layer of ash material. Ash will be used to seal around the edges of the incinerator ash pond. Vibratory compact incinerator ash after it has been installed. If vibratory compaction causes the incinerator ash to liquefy, notify ADEC to develop an alternate approach for placement of the incinerator ash.

Step 8 Cover incinerator ash with a Type A Non-Woven geotextile filter fabric

conforming the requirements of CBJ Standard Specification Section 02714 Filter Cloth.

Step 9 Cover filter cloth with approximately 24” of imported backfill material

subbase grading per CBJ Standard Specification 02202 Excavation and Embankment. Place in 12” lifts and vibratory compact imported backfill to 95% of maximum density. Place imported fill to the grades as shown on Figure 2 and Figure 3.

Step 10 Place a final incinerator ash pond monofill cover of 6” D-1 conforming

to the gradations of CBJ Standard Specification Section 02204 Base Course. Place in one lift and vibratory compact D-1 to 95% of maximum density. Compacted D-1 material is used to construct gravel roads in Juneau and, when graded, sheds water as opposed to allowing it

jldorn

Rectangle


Page 6 of 8

to percolate into the road bed. The 6" D-1 final cover material will be graded to promote surface water runoff away from the incinerator ash pond monofill and to minimize the potential for erosion and standing water. The incinerator ash pond will be periodically inspected to ensure surface drainage is not causing any standing water on the wastewater treatment plant site. If standing water from the incinerator ash pond area is observed, CBJ will develop an alternate plan for handling surface drainage and submit it to ADEC for review and approval.

All work on the pond will be scheduled for days without excessive precipitation. Work will be halted when precipitation causes ponding in the fill area or adversely impacts compaction of the material. In accordance with 18 AAC 60.460 (e), the final 24" of fill on the incinerator ash pond will be graded to promote drainage without erosion. It will consist of a minimum 18" thickness of clean imported backfill material topped with 6" of D-1 road subbase. CBJ will inventory its stockpiles of imported backfill material and D-1 road subbase to ensure it has sufficient material on hand to complete the closure plan. The City and Borough of Juneau intends to monitor the final cover for subsidence and erosion over a five year period. Additional D-1 surface grading fill will be added to any areas impacted by subsidence or erosion to maintain optimal drainage at the site. There are no plans to seed the site since it will be used primarily for parking vehicles.

3.2 Leachate Collection System

The CBJ Incinerator Ash Disposal Pond is not equipped with a liner or a leachate collection system; therefore, no operation or maintenance of such a system is applicable. The site will be capped and graded in accordance with 18 AAC 60.460 (e), and as discussed above, to minimize surface water runoff at the site.

3.3 Methane Gas Monitoring

The CBJ Incinerator Ash Pond is located within the fenced secured area of the JDWWTP site. The existing incinerator building is located approximately 50' from the edge of the ash pond. Since no organic material such as sewage sludge will be disposed of in the ash pond, the potential for generating methane gas is extremely low. However, tests indicate that the fine sand and grit from the aeration basins and sludge digester contains small quantities of organic material (approximately 5%). As a result, methane gas monitoring will be conducted on a monthly basis in the existing Incinerator building for the 1st year following site


Page 7 of 8

closure. If no methane gas is detected the monitoring program will be discontinued. If methane gas is detected, necessary action will be taken to correct any problems associated with methane buildup at the site and the gas monitoring schedule will be reevaluated at that time.

3.4 Proposed Land Use Following Closure Post-closure, the facility site will continue to remain dedicated to wastewater treatment and disposal and access will continue to be restricted. The City and Borough of Juneau intends to use the former incinerator ash pond monofill area primarily for parking public works vehicles and equipment. At time other inert materials will be stored on the site. D-1 surface material will be stockpiled at the site and will be available to maintain final grading of the former ash pond area.

3.5 Public Access Restrictions Public access to the site will remain restricted. The entire JDWWTP site is fenced and the gates to the site will remain in place and locked whenever there are no operators at the plant.

4.0 Post Closure Monitoring and Inspection The City and Borough of Juneau will conduct monthly site inspections as part of their normal operation of the JDWWTP. During the inspections, CBJ personnel will walk the site and observe the integrity of the final cover and to check for proper grading to ensure surface drainage from the site is adequate.

5.0 Closure Demonstration The City and Borough of Juneau will record a notation on the deed to the facility property in accordance with 18 AAC 60.490. The notation will state: That the land has been used as an incinerator ash pond monofill That sewage sludge incinerator ash and aeration basin and sludge digester fine sand

and grit was placed in the incinerator ash pond monofill The geographic boundaries of the incinerator ash pond monofill The details of final cover and devices installed as part of the incinerator ash pond

monofill closure


Page 8 of 8

The notation may not be removed from the deed unless all of the wastes are removed from the property and any hazardous materials at the site are cleaned up to the satisfaction of the ADEC Contaminated Sites Program.