new watermain commissioning requirements...flush, bfp certification and to feed the site for...

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February 11, 2020 Revision #: 3.0

NEW WATERMAIN COMMISSIONING REQUIREMENTS

TABLE OF CONTENTS

Table of Contents ……………………………………………………………………………………………….……………………..……………1

Overview: Watermain Commissioning Requirements (Appendix Q) Flowchart………………..…………………….3

1 INTRODUCTION ..................................................................................................................................... 6

1.1 Obligations .................................................................................................................................... 6

1.2 Requests ........................................................................................................................................ 6

1.3 Mandatory Submissions ................................................................................................................ 7

1.4 Site Meetings ................................................................................................................................ 7

2 NEW WATERMAIN – PHYSICALLY SEPARATED FROM EXISTING WATERMAIN ..................................... 9

2.1 Source ........................................................................................................................................... 9

2.1.1 Cut in “ T “ .................................................................................................................................. 9

2.1.2 Live Taps ..................................................................................................................................... 9

2.2 Installation and Certification of Backflow Prevention Assembly ................................................ 10

2.2.1 Installation: ......................................................................................................................... 10

2.3 Loading and Swabbing ................................................................................................................ 16

2.4 Flushing for Turbidity and Turbidity Testing ............................................................................... 16

2.5 Hydrostatic Pressure Testing ...................................................................................................... 16

2.6 Chlorination ................................................................................................................................ 17

2.7 Dechlorination ............................................................................................................................ 17

2.8 Sampling ...................................................................................................................................... 17

2.9 Installation of Closure Piece for New Mains Physically Separated from the System ................. 18

2.10 Mandatory Submission ............................................................................................................... 19

2.11 Implementing a Flushing Program** .......................................................................................... 20

2.11.1 Program Structure, Reporting & Obligations ...................................................................... 20

2.11.2 Regulatory Mandates and Obligations................................................................................ 21

2.12 Phasing out of Flushing Program ................................................................................................ 21

2.13 Constructed, non-Commissioned Watermain ............................................................................ 21

3 NEW WATERMAIN ISOLATED BY A VALVE FROM EXISTING WATERMAIN ......................................... 32

http://www.vaughan.ca/Pages/default.aspx

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4 SERVICING TO CONDOMINIUMS / PRIVATE TOWN HOMES / INDUSTRIAL, COMMERCIAL,

INSTITUTIONAL BUILDINGS ......................................................................................................................... 33

4.1 Backflow Prevention ................................................................................................................... 33

4.2 Private Side Testing ..................................................................................................................... 34

4.2.1 Installation: ......................................................................................................................... 34

4.3 Private Side (Plumbing Side) Commissioning .............................................................................. 35

4.4 Final Connection ......................................................................................................................... 35

5 Revision History .................................................................................................................................. 36

Figures, Diagrams, Charts & Forms

• Watermain Disinfection Checklist for Contractors & Subcontractors…………………………………………………8

• Backflow Preventor (BFP), Water Meter & By-Pass – Setup…………………………………………………………… 12

• Backflow (RP), Test inspection Report………………………………………………………………………………………..13-14

• New Watermain Commissioning Schematic (Sample Point Allocation) …………………….....…………………15

• Commissioning New Watermain – Physically Separated (Flow Chart) …..…………………………………..22-23

• Contractor/Subcontractor Site Summary………………………………………………………………………………………..24

• Watermain Disinfection Plan/Map – Disinfection Criteria……………………………………………………………….25

• Watermain Disinfection Plan/Map – Disinfection Site Map…………………………………………………………….26

• Watermain Disinfection Plan/Map – Swabbing Map……………………………………………………………………….27

• Disinfection Records…………………………………………………………….…………………………………………………………28

• Dechlorination/Discharge LOG………………………………………………………………………………………………………..29

• New Development Watermain Flushing Program – 3rd Party Chlorine Residuals……………………………..30

• Phasing out of Flushing Program – Consumption Calculation………………………………………………………….31


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Definitions

AWWA C651: American Water Works Association Standard for Disinfecting Water Mains

AWWA C655: American Water Works Association Standard for Field Dechlorination

CFU/1ml: Colony Forming Unit per milliliter (Lab Results)

Commissioned: Watermain deemed as “in service” by City of Vaughan staff for the distribution of

potable/safe drinking water

Cross-Connection Control Specialist: means an individual who has completed and passed an

Ontario Water Works Association (OWWA) endorsed Cross-Connection Control Course, or approved

equivalent;

CSA B64.10/B64.10.1 (B64): means a series published by the Canadian Standards Association, as

amended, which covers backflow performance, construction, selection, installation, maintenance

and field-testing requirements for backflow preventers;

Disinfection Chlorine Contact Time: The Sample representation of standing chlorinated water from

chlorination. For a minimum of 24 hours NO flushing shall take place

DWWP: Drinking Water Works Permit, provide a description of the overall system, an authority to

alter the system in a specified way

Flushing: The sudden rush of water for the purpose of cleaning, scouring or the turnover of

watermain

Form #1: Record of Watermains Authorized as Future Alteration

Form #2: Record of Minor Modification or Replacements to the Drinking Water System

Form #3: Record of Addition, Modification or Replacement of Equipment Discharging a contaminant

of concern to the Atmosphere

MDWL: Municipal Drinking Water Licence, information and rules for owners/operators of the

systems supplying drinking water to municipalities

MECP: Ministry of the Environment, Conservation and Parks

mg/L: Milligrams per Liter (PPM)

Microbiological test: water samples taken and analyzed for E. coli, Total Coliform, background

microorganisms and HPC (Heterotrophic Plate Count)


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Non-commissioned: Watermain that is not in service and unavailable for distribution of

potable/safe drinking water

NTU: Nephelometric Turbidity Unit

Potable Water (AWWA): Does not contain objectionable pollutants or contaminants, and is

considered satisfactory for Drinking or culinary purposes

Operative: Person or entity conducting work. For the purposes of this procedure, an Operative can

be either the “Consulting Engineer” for new developments and/or the “Contractor” for capital

projects

Operator: A MECP Certified drinking water operator

Operator in Charge (OIC): MECP Certified drinking water operator with a minimum of Level 1

operator certificate

PPM: Parts per million (mg/L)

Reduced Pressure Principle Backflow (RP): means a backflow preventer that consists of a

mechanically independently acting, hydraulically dependent relief valve located in a chamber

between two independent operating, force-loaded check valves.

Reduced Pressure Principle Test & Inspection Report: a form prescribed by the City, that

documents backflow preventer information such as the make, model, serial number, size, type,

installation date, installation address, the Cross-Connection Control Specialist who performed the

test, and the test results;

Sample Round: Consists of two (2) sets of samples at least 16hrs apart (Set #1 and Set#2)

Sample Set #1: Collected at 1(one) or more sample point locations after dechlorination or Flushing

watermain (Initial Samples)

Sample Set #2: Collected at 1(one) or more sample point locations NO less than sixteen (16) hours

following collection of initial samples (set #1). During the 16 hrs. waiting time No Flushing shall take

place and samples are representation of standing water in the watermain

Swab: A polyurethane foam plug used to clean watermain

Turbidity: Measured in NTU for Suspended particles in watermain

Wet Taps: Operational task where a tapping device is used to cut (circular cut) and connect to

existing watermain under pressure. Used to connect a New watermain or Service connection


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NEW WATERMAIN COMMISSIONING REQUIREMENTS

1 INTRODUCTION

1.1 Obligations

The City of Vaughan has adopted Ontario Ministry of the Environment, Conservation and Parks (MECP) Watermain Procedure for commissioning all new and temporary watermain. Additional to this procedure, the City of Vaughan also has an obligation to adhere to the most current version of

➢ Municipal Drinking Water Licence ➢ Drinking Water Works Permit (DWWP) ➢ Ministry’s Watermain Disinfection Procedure ➢ AWWA Standard C651 ➢ City of Vaughan’s most recent By-Law (or otherwise amended)

o Water: 177-2016 o Backflow Prevention: 004-2018 o Water Rates: 195-2019 & Wastewater Rates: 196-2019

Service pipes of 100mm diameter shall be considered as watermain for the purposes of this procedure.

All new mains will be physically separated from the existing water distribution system during the commissioning process. Requests for isolation (by a valve) of the new watermain from the existing water distribution system will be reviewed on a case by case basis and shall be permitted only if physical separation is not a viable option. It will be the responsibility of the Operative (see definitions) to demonstrate that isolation by a valve is the only available option. The decision of the City of Vaughan will be considered final.

A MECP Certified, City of Vaughan Water Operator is required to witness and verify all commissioning activities including:

• Physical Separation

• Isolation by a valve (Special Case)

• Condominium, Commercial, Industrial, Private Townhomes, Institutional ONLY City Side Distribution System (Water main to Property line Valve) Operative’s responsibility to hire competent company to commission Private side (Plumbing)

1.2 Requests

All requests for commissioning activities must be scheduled through the Environmental Services Dispatch office by providing a minimum of three (3) business day’s notification to the City. The Applicant shall hand deliver the following information to the attention of the


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Environmental Services Dispatch Office, otherwise the request will be denied. Requests will not be processed earlier.

A Service Request Form (SRF) must be completed prior to work commencing. These forms are located and can be downloaded from the City’s website at: https://www.vaughan.ca/services/residential/water/Pages/default.aspx.

1.3 Mandatory Submissions

General plan/key plan must be submitted to the Environmental Services Department during business

hours (Monday to Friday - 8:30 AM to 4:30 AM) located at 2800 Rutherford Road. Drawings must

identify street names and highlight the limits by lot/block numbers of the watermain commissioning

area. The general plan must contain ONLY site servicing information (No grading/landscaping, etc.).

General Plan/Key Plan

• Four (4) copies of an 11 x 17

• Four (4) copies of a 24 x 36

The Operative shall submit a disinfection proposal plan to the Supervisor(s) of Water Operations. This plan shall be reviewed and approved prior to any work commencing and will include:

a) The disinfection criteria shall include watermain dimensions, watermain material, disinfection method, contact time, concentration, receiving location and source of water supply.

b) Disinfection site map and key map shall be submitted and will include location of mainline valves, (e.g. V1, V2, etc.), flushing points, sampling points (e.g. S1, S2, etc.), etc.

c) Calculation sheets including chemical volumes, watermain volume, flushing discharge rate and chemical application rates.

Note: Watermain Disinfection Checklist for Contractor & Subcontractors attached to this document (See Page 08). Check & Verify whether you meet the minimum requirements to proceed with the project

1.4 Site Meetings

A site meeting with the Environmental Services (Water & Compliance) and Development Engineering / Infrastructure Delivery is mandatory prior to the start of the commissioning. Arrangements for the site meeting shall be coordinated by the Operative and shall be made through the City’s Environmental Services Dispatch office.


https://www.vaughan.ca/services/residential/water/Pages/default.aspx

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2 NEW WATERMAIN – PHYSICALLY SEPARATED FROM EXISTING WATERMAIN

All commissioning and disinfection of new watermains and temporary watermains are to be completed in accordance with most recent version of the Ministry of the Environment, Conservation and Parks (MECP) Watermain Disinfection Procedure and American Water Works Association (AWWA) Standard C651.

City of Vaughan Certified Water Operator must be present to witness all steps within this procedure. All requests for scheduling an Operator must be done through the Environmental Services Dispatch at 905-832-2281 x 6208 during business hours (8:00 AM to 4:00 PM) or email Access Vaughan @ [email protected]

Operative is fully responsible to have contractor/subcontractor at site during all scheduled commissioning appointments with the city.

2.1 Source

New watermain projects, for By-Pass feed the contractor should use a tapping sleeve

valve or Cut in “T” with valve to connect to the existing Water Distribution System.

Watermain surface at the location of the Tap or Cut In “T” shall be cleaned and

disinfected as per ministry’s watermain disinfection procedure and AWWA Standards.

After completion, install By-pass with Backflow Preventer. Only city of Vaughan

certified water Operator are authorized to Operate the Tapping sleeve valve/valve to

flush, BFP Certification and to feed the site for commissioning.

2.1.1 Cut in “ T “

May require watermain shutdown and notification. At the time of scheduling

with the Environmental Services Dispatch office, a drawing of the affected area

(those impacted by the shutdown) along with a water disruption notice shall be

submitted. It is the responsibility of the Operative for the shutdown to provide a

minimum 48 hours notification to those that will be affected by the

water service disruption.

2.1.2 Live Taps

Any live tap 2” (50mm) and above shall be pressurized at 150 psi (1034 kPa) for 30 minutes with no leaks.


mailto:[email protected]

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2.2 Installation and Certification of Backflow Prevention Assembly

The City of Vaughan only permits a Reduced Pressure Principle Assembly (RP) type backflow to be

used through-out the watermain commissioning procedure.

All temporary watermain service connections to the Municipal Drinking Water System must be

equipped with a CSA B64 approved Reduced Pressure Principle Assembly installed in

accordance with CSA B64 (as amended) and manufacturers specifications (See Page 12)

All potable water used for the commissioning procedure that is obtained from the City of

Vaughan’s Water Distribution System shall first pass through bypass, RP and water meter.

The owner, contractor or developer who creates an illegal connection shall be liable for all costs

associated with the work undertaken by the City or its agents, to restore the status of the

Municipal Drinking Water System.

2.2.1 Installation:

Prior to the source water being turned on, the contractor or developer must demonstrate to

the satisfaction of the City of Vaughan, including providing original documents, that the

backflow assembly is in compliance with the CSA B64 standard and will function properly.

Only City of Vaughan issued backflow test and inspection reports can be submitted and

accepted by the City. Forms attached to this document (Pages 13-14) and also found at

vaughan.ca

All backflow assemblies shall be tested and certified in place by an OWWA Cross Connection

Control Specialist who holds a valid tester certificate.

Please Note: City of Vaughan reserves the right to request proof of a valid OWWA Cross-

Connection Control Tester certificate the individual preforming the backflow field test.

A City of Vaughan certified water operator must witness all field tests for the duration of the

watermain commissioning job. Please note that any backflow assembly must be tested at the

following times:

a. upon installation;

b. when cleaned, repaired, or overhauled;

c. when relocated; and

d. as required by the authority having jurisdiction


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Backflow preventers shall not be removed until completion of the commissioning project and

without first notifying the City of Vaughan.

1) Backflow and By-Pass Must remain at site till Closure Piece

2) Earlier removal maybe approved by city. Make arrangements for Water operator to

witness the process and properly secure the newly tested watermain without contaminating.

Failure to comply may place the operative to recommission the site.

Reduced Pressure Principle Assemblies must be installed as per CSA B64 and are not permitted

to be installed in a below grade structure (chamber, trench, etc.). The bottom of the pressure

differential relief vent must be minimum 300mm above the potential flood plain. (See )


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2.3 Loading and Swabbing

• All swabs shall be clean and new

• Swabs shall be one size larger than the pipe diameter

• All swabs shall be marked by the number in the order by which they are launched

• Minimum 2 swabs required on each section of watermain

• If needed, City of Vaughan Operator in Charge (OIC) may request to place more swabs

• All swabs must be collected after launching

• For sections of watermain which cannot be swabbed due to a butterfly valve installation or size/pipe material, the watermain shall be flushed as per AWWA C651 to ensure minimum flushing velocity of 3.0 ft/sec (0.91 m/s) in order to achieve 2.5 to 3.0 log removal of particles.

2.4 Flushing for Turbidity and Turbidity Testing

• Watermain shall be flushed to ensure that air and other material have been removed. This includes all hydrant leads, services and sample point locations

• All Hydrant must be flushed with high velocity until turbidity achieved less than 1.0 NTU, since Hydrant/lead NOT part of swabbing

• The watermain must be flushed until a turbidity of less than 1.0 NTU is achieved. If turbidity of 1.0 NTU cannot be achieved within 8 hours of flushing, the watermain shall be Re-swabbed.

• Turbidity results shall be taken at each sample location (See Page 15) and documented on the “Disinfection Record” (See Page 28).

• The flushing velocity shall not be less than 3.0 ft/sec (0.91 m/s) in order to achieve 2.5 to 3.0 log removal of particles as per AWWA C651. If such flow rate is not possible, then flushing at the maximum expected velocity for the line for 2-3 times the volume of the line may be acceptable.

2.5 Hydrostatic Pressure Testing

• A safety restrainer is required on riser caps

• Prior to the start of the pressure test, the new watermain must be fully disconnected and separated from the upstream RP assembly. If the backflow is physically removed from the bypass piping arrangement, it must be recertified prior to is being used again.

• Watermains must hold at 150 psi (1034 kPa) for 2 consecutive hours, with no leaks and no additional water added once pressurized. NOTE: Only HDPE (High Density Polyethylene) watermain will have allowable leakage with respect to Manufacture recommendation.

• All pressure test Failures will result in rescheduling of appointment which may include retesting of turbidity (if repair made on watermain by draining the watermain) and hydrostatic pressure test.

• Calibrated gauges must be used at all times


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2.6 Chlorination

• Continuous feed chlorination will be used and introduced through the by-pass (backflow preventer) using the water from the distribution system

• Chlorine concentration range should be within the range of 80-120 ppm (mg/L)

• Note: Appropriate chlorine high-count instrument to be used to verify high chlorine concentrations

• Entire watermain including all stubs & Hydrants shall be chlorinated

• All sample points readings must be recorded on ‘Disinfection Record’ (See Page 28).

2.7 Dechlorination

• Appropriate chlorine high-count instrument to be used to verify high chlorine concentration

• Minimum 24hr Contact Time required Note: NO flushing shall take place between Chlorination and High-count chlorine testing (during contact time). Sample taken for high count will represent the of standing chlorinated water inside watermain

• Chlorine contact time Minimum of 24 hrs. (Preferable) & Maximum of 72 hrs.

• All sample points with high chlorine counts readings must be recorded on “Disinfection Record” (See Page 28). All sample locations test results shall remain at least 60% from initial dose of chlorine or maximum of 50 PPM (mg/L) drop from initial dose of chlorine. If one of the sample location fails then entire site has to be re-chlorinated

➢ FAIL: Entire Watermain (including stubs, Hydrants, etc.) All water shall be neutralized before discharging (Dechlorinated as per AWWA C655-Field Dechlorination). If required fill Dechlorination Log form (See Page 29) Operative/Contractor shall book for Re-chlorination and following appointments with the city

➢ PASS: Entire Watermain (including stubs, Hydrants, etc.) All water shall be neutralized before discharging (Dechlorinated as per AWWA C655-Field Dechlorination). If required fill Dechlorination Log form (See Page 29)

➢ Flush watermain, take chlorine residuals at all sample points and discharge points. Ensure that Chlorine residuals at 1.0 PPM (mg/L) at all points or greater and be reflective of the trend of the City.

➢ Prepare for sampling (Set #1)

2.8 Sampling

• After final flushing (Dechlorination event/Flushing event) and before the new watermain is connected to the existing water distribution system, two (2) consecutive sets (Set #1 & Set #2) of passing microbiological samples shall be taken at least 16 hours apart (as per AWWA C651, section 5.1)


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Record Final Chlorine residuals on “Disinfection Record” (See Page 28). ➢ Set #1: Collected by City of Vaughan Certified Water Operator at 1(one) or

more sample point locations after dechlorination or Flushing watermain (Initial Samples)

➢ Set #2: Collected by City of Vaughan Certified Water Operator at 1(one) or more sample point locations, NO less than sixteen (16) hours following collection of initial samples (set #1). During the 16 hours waiting time No Flushing shall take place and samples are representation of standing water in the watermain

• At least one (1) set of samples shall be collected from every 360 meters (1181 feet) of the new watermain, plus one set from the end of each branch (Service Lines, Dead Ends, Branches). See Page 15

• Sample points shall be constructed with appropriate fittings

• Coordination to obtain samples will be arranged by the Operative

• All water distribution microbiological samples will be conducted by city of Vaughan certified water Operator

• Note: If more than 2 sets of samples are required to obtain release of the new watermain, the Operative shall reimburse the City for the additional cost incurred by the City resulting from the additional testing and sampling of the watermain section, consistent with City of Vaughan By-Law: 195-2019 & 196-2019 (or as otherwise amended). This cost will include administration, additional water usage, laboratory fees, staff and resource charges.

City of Vaughan’s Criteria for New Watermain Microbiological Tests

E. coli 0

Total Coliform 0

Background <= 25 HPC <= 250

2.9 Installation of Closure Piece for New Mains Physically Separated from the System

• It shall be the responsibility of the Operative to enquire and/or request the laboratory results from Environmental Services.

• Operative shall coordinated with all parties in advance for the closure piece and book

for an appointment with Environmental Service Dispatch office by providing a minimum

of three (3) business day’s notification.

• City of Vaughan certified water operator Shall witness Backflow and By-Pass removal

prior to closure piece. Earlier removal maybe approved by city with city of Vaughan


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certified water operator witnessing the process and properly secure the newly tested

watermain without contaminating. Failure to comply may place the operative to

recommission the site.

• Closure pieces shall not exceed 3 meters with minimum connection pieces unless pre-authorized by the City of Vaughan

• Closure pieces shall be planned and scheduled through the City of Vaughan’s Environmental Services Dispatch office by the Operative. Note: Closure Piece Shall be completed within 15 days from the last passing sample taken (Set #2). Failure to do so may require additional samples / re-commissioning

• At the time of scheduling with the Environmental Services Dispatch office, a drawing of the affected area (those impacted by the shutdown) along with a water disruption notice shall be submitted. It is the responsibility of the Operative for the shutdown to provide a minimum 48 hours notification to those that will be affected by the water service disruption.

• City of Vaughan certified water operator shall witness Closure piece. Operative shall make arrangements for City Inspector (Development Engineering / Infrastructure Delivery) to proceed with closure piece.

• As per Watermain Disinfection Procedure & AWWA C651, all piping must be thoroughly cleaned and disinfected using 1% sodium hypochlorite solution or equivalent (Ex. Fittings/pipe shall be sprayed with chlorine solution and pipe hand swabbed with chlorine solution)

• To eliminate the possibility of contamination or the presence of foreign material, trench water must be kept from entering the watermain, by keeping the excavated area dewatered at all times. An air gap must be maintained between pipe and ground water. If the watermain becomes contaminated, the entire watermain commissioning procedure shall be repeated.

• Once the closure piece(s) are complete, the Operator will flush that section to the nearest hydrant or available flushing point, take chlorine residuals and may take microbiological sample if required. Valves will be turned on and make site part of water distribution system.

• If required for the site, Operative Shall be responsible for New Development Flushing program from closure piece date as per City of Vaughan’s 3rd party flushing program Criteria

• Watermain that is not commissioned, and non-potable shall not be used for construction purposes and no service connections shall be permitted (example: model homes)

2.10 Mandatory Submission

• Upon completion of the project, all records specified in this document as part of New

watermain commissioning Shall be submitted to the city and retained as part of record

keeping (See Pages 24-29)


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2.11 Implementing a Flushing Program

• It is the sole responsibility of the Operative to ensure that the newly constructed watermain maintains the regulated secondary disinfection (chlorine residuals) as required per Ontario Regulation 170/03. If the City determines that a flushing program is required, a valid copy of the MECP water distribution Operator certificate must be submitted to the Environmental Services – Compliance & Training and approved prior to the start of the flushing/residual program. Any existing City assets and infrastructure (e.g.: valves, fire hydrants, etc.) shall not be accessed until formal authorization had been given by the City. The City of Vaughan staff reserve the right to request proof of a valid MECP water distribution Operator certificate from any individual preforming flushing activities on its water system.

• At start of watermain commissioning Operative must submit a flushing plan for approval, clearly identifying flushing points, discharge locations and size of output along with a letter of intent identifying details of AWWA C651, Table 3, and a proposed diagram to include flushing runs, calculation of proposed flushing volumes for each run and chlorine residual sampling/flushing locations.

• During the winter season, road salt must be applied to those areas affected by flushing to ensure public safety.

• Uni-directional flushing shall be completed at a minimum velocity of 0.91 meters per second or 3.0 ft/sec (as per AWWA Standard C651 Section 4.4.2.) or as otherwise amended. If such flow rate is not possible, then flushing at the maximum expected velocity for the line for 2-3 times the volume of the line may be acceptable.

• Chlorine residuals shall be taken and be reflective of the trend of the City.

• All valves are to be returned to the open position when flushing is not taking place and all flushing/residual points are to be closed when flushing is not taking place.

• The flushing program will commence no later than 15 calendar days from the date that the final passing sample (Set #2) was taken.

• It shall be the responsibility of the Operative to enquire and/or request the laboratory results from Environmental Services. ** The City of Vaughan is the sole authority regarding approving, changing and terminating all commissioning and flushing programs.

2.11.1 Program Structure, Reporting & Obligations

• It is mandatory that flushing programs start with one (1) flushing event and three (3) chlorine residual events per week.

• The City shall be notified of a schedule identifying days of the week these events will occur.

• The Operative shall be responsible for supplying and maintaining meters used at flushing/residual points.

• All flushed water must pass through a water meter at all flushing/residual points.

• All water meters shall be approved prior to use by the City.


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• Every flushing and residual event shall be logged on City issued and MECP endorsed document “New Development 3rd Party Chlorine Residual/Consumption” (See Page 30) and supplied to the email address [email protected] within one (1) week of obtaining the results.

• Water consumption will be invoiced to the Developer on a quarterly basis and will reflect the water/wastewater rate for the dates that the water is taken.

• Invoices will include charges for both water and wastewater and a 15% administration fee.

2.11.2 Regulatory Mandates and Obligations

• Minimum combined chlorine residuals must be higher than 0.30 mg/L and shall not drop below the regulated 0.25 mg/L.

• Maximum combined chlorine residuals must be below 2.75 mg/L and shall not go above the regulated limit of 3.0 mg/L.

• If a combined chlorine residual of less than 0.30 mg/L or above 2.75mg/L is obtained, the City of Vaughan (Environmental Services Dispatch office) shall immediately be notified by calling 905-832-2281 x 6208 during the business hours & after hours call Access Vaughan at 905-832-2281 and press 0. Also send Immediate follow up email to [email protected].

2.12 Phasing out of Flushing Program

• Reduction and phasing out of flushing programs will be determined on a case-by-case basis. Consideration will be made based on build out, occupancy, presence of dead-ended watermain, and the watermain turnover rate.

• Consumption calculations must be filled out to determine the watermain turnover rate (See Page 31) and must be submitted with the request for program reduction/elimination. Requests can be made by email to [email protected].

2.13 Constructed, non-Commissioned Watermain

• If the choice has been made to not fulfill the requirements of a flushing program, it will be considered constructed watermain but “non-commissioned” unless otherwise identified by the City.

• Disconnection will not be completed by the City.

• Physical separation must be established 1 meter outside of the valve chamber.

• A letter of intent must be supplied to the City identifying length of time the watermain will be constructed and non-commissioned.

• Each subdivision will be considered on a “case-by-case” basis for approval.





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Phasing out of Flushing Program – Consumption Calculation


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3 NEW WATERMAIN ISOLATED BY A VALVE FROM EXISTING WATERMAIN

Requests for isolation (by a valve) of the new watermain from the existing water distribution system will be reviewed on a case by case basis and shall be permitted only if physical separation is not a viable option. It will be the responsibility of the Operative to demonstrate that isolation by a valve is the only available option. The decision of the City of Vaughan will be considered final.

• Operative Shall arrange for meeting with City for site approvals

• Upon approval city will provide site specific disinfection procedure for new watermain commissioning

All commissioning and disinfection of new watermains are to be completed in accordance with most recent version of the Ministry of the Environment, Conservation and Parks (MECP) Watermain Disinfection Procedure and American Water Works Association (AWWA) Standard C651.


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4 SERVICING TO CONDOMINIUMS / PRIVATE TOWN HOMES / INDUSTRIAL,

COMMERCIAL, INSTITUTIONAL BUILDINGS

City of Vaughan certified operator will be responsible for witnessing Backflow Preventer

Certification, Backflow Preventer removal and operations of the City valve(s) at the lot line

(Property Line). Operative shall hire competent company for private side commissioning

including final connection (Closure Piece). Commissioning records shall be submitted to the city

upon completion.

Note:

• ONLY City of Vaughan certified operators are authorized to operate the property line

Valve (Part of Distribution System).

• All Commission must be conducted with complete separation at the lot line

(Property Line).

• Zero setback lots will be reviewed on case by case basis and shall be permitted only if

physical separation at property line is not a viable option. It will be the responsibility of

the operative to demonstrate that physical separation is not an option at the property

line and arrange for meeting with the city for amendment/approvals.

o Upon approval City will provide site specific disinfection procedure for the

service line commissioning

4.1 Backflow Prevention / Water Meter - (Permanent for the building)

• Once the watermain is commissioned on the City side, backflow and water meter(s) are to be installed without delay. For site specific design refer to City of Vaughan’s Engineering Design Criteria & Standard Drawings, Appendix A – Standard Drawings (January 2018), found at http://www.vaughan.ca/services/DesignCriteria/files/Standard%20Drawings.pdf or otherwise amended.

• Consult Development Engineering or Infrastructure Delivery for more information regarding design and installation

• The backflow device shall be tested at the time of installation by a certified Cross-Connection Control Specialist with a valid tester license.

• All City of Vaughan Backflow Test Reports must be emailed to [email protected] at the completion of the test.


http://www.vaughan.ca/services/DesignCriteria/files/Standard%20Drawings.pdf


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4.2 Private Side Testing

• Commissioning must be conducted with complete separation at the property line with an approved certified backflow preventer in place.

• The City of Vaughan only permits a Reduced Pressure Principle Assembly (RP) type

backflow to be used through-out the private side watermain commissioning procedure.

• All temporary water service connections to the Municipal Drinking Water System must

be equipped with a CSA B64 approved Reduced Pressure Principle Assembly installed

in accordance with CSA B64 (as amended) and manufacturers specifications

• All potable water used for the commissioning procedure that is obtained from the City

of Vaughan’s Water Distribution System shall first pass through bypass, backflow and

water meter.

• The owner, contractor or developer who creates an illegal connection shall be liable for

all costs associated with the work undertaken by the City or its agents, to restore the

status of the Municipal Drinking Water System.

4.2.1 Installation:

• Prior to the source water being turned on, the contractor or developer must

demonstrate to the satisfaction of the City of Vaughan, including providing original

documents, that the backflow assembly is in compliance with the CSA B64 standard and

will function properly.

• Only City of Vaughan issued backflow test and inspection reports can be submitted and

accepted by the City. Forms attached to this document (Pages 13-14) and also found at

vaughan.ca

• All backflow assemblies shall be tested and certified in place by an OWWA Cross

Connection Control Specialist who holds a valid tester certificate.

Note: City of Vaughan reserves the right to request proof of a valid OWWA Cross-

Connection Control Tester certificate the individual preforming the backflow field test.

• A City of Vaughan certified water operator must witness all field tests for the duration of

the watermain commissioning job. Please note that any backflow assembly must be

tested at the following times:

a. upon installation;

b. when cleaned, repaired, or overhauled;

c. when relocated; and

d. as required by the authority having jurisdiction


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• Backflow preventers shall not be removed until completion of the commissioning project and without first notifying the City of Vaughan. 1) Backflow and By-Pass Must remain at site till Closure Piece 2) Earlier removal maybe approved by city. Make arrangements for Water operator to witness the process and properly secure the newly tested watermain without contaminating. Failure to comply may place the operative to recommission the site.

Reduced Pressure Principle Assemblies must be installed as per CSA B64 and are not permitted

to be installed in a below grade structure (chamber, trench, etc.). The bottom of the pressure

differential relief vent must be minimum 300mm above the potential flood plain. (See Page 12)

4.3 Private Side (Plumbing Side) Commissioning

• Operative shall hire competent contractor to commission watermain.

• Analysis of the microbiological samples must be done by MECP Certified Accredited

Laboratory. Copies of the passing sample results from an MECP Certified Accredited

laboratory will be provided to the City within 15 days from the date the last sample was

taken

• It will be responsibility of the Operative to book city of Vaughan certified water operator

for valve operations for Clouse piece and water turn on.

4.4 Final Connection

• Private services up to 75mm diameter require flushing and chlorine residual testing. The combined chlorine residuals shall not be less than 1.0 mg/L before the City will turn on the service valve.

• For private services 100 mm diameter and larger, chlorine residual testing and microbiological sampling by an Operator is required. Passing Microbiological results for the private side must be received by the city within 15 days from the date that the sample was taken and Closure Piece shall be completed by the 15th day. Failure to do so will require the commissioning procedure to be conducted again.

• Operative is fully responsible for obtaining approval from Development Engineering or Infrastructure Delivery regarding the building’s Backflow Preventer and Water Meter. Ensure both Backflow Preventer and Water Meter are in place prior to request for water turn on for the building


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If further information is required, please contact the City of Vaughan

• Environmental Services, Dispatch office (During Business Hours from 8:00 AM to 4:00 PM) 905-832-2281 x 6208

• Access Vaughan (After Hours from 4:00 PM to 8:00 AM) 905-832-2281 and press 0. Email: [email protected]

5 Revision History

Date Revision # Reason for Revision

Jul-2010 0 Procedure for: New Watermain Systems Requirements &

Procedures

Jan-2015 1 Update: New Watermain Systems Commissioning

Requirements & Procedures

18-Apr-2017 2 Update: New Watermain Commissioning Requirements

11-Feb-2020 3 Update: New Watermain Commissioning Requirements



new watermain commissioning requirements...flush, bfp certification and to feed the site for...

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