NEW WATERMAIN COMMISSIONING REQUIREMENTS · 2021. 3. 24. · AWWA C655: American Water Works...

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February 1, 2021 Revision #: 4.0

NEW WATERMAIN COMMISSIONING REQUIREMENTS

TABLE OF CONTENTS

Table of Contents……………………………………………………………………………………………………………………………………..…….1 Overview: New Watermain Commissioning Requirements – Flowchart……………………………………….…………..………3 New Watermain Commissioning Requirements – Framework……………………………….…………..…………...4 Definitions……………………………………………………………………………………………………………………………………………………….8

INTRODUCTION ......................................................................................................................................... .11

1.1 Obligations ......................................................................................................................................... 11

1.2 Mandatory Submissions ..................................................................................................................... 12

1.3 Commissioning Schedule Requests .................................................................................................... 13

1.4 Site Meetings ..................................................................................................................................... 13

NEW WATERMAIN – PHYSICALLY SEPARATED FROM EXISTING WATERMAIN .......................................... 15

2.1 Source................................................................................................................................................. 15

2.1.1 Live Taps .......................................................................................................................................... 16

2.1.2 Cut in “T” .......................................................................................................................................... 16

2.1.3 Hydrant (Only if Live Tap / Cut-in-“T” are not a viable option) ....................................................... 17

2.2 Backflow Prevention Assembly .......................................................................................................... 17

2.2.1 Installation and Certification: .................................................................................................... 17

2.2.2 Removal: .................................................................................................................................... 18

2.2.3 Exceptions: ................................................................................................................................. 18

2.3 Loading and Swabbing ....................................................................................................................... 23

2.4 Flushing for Turbidity and Turbidity Testing ...................................................................................... 23

2.5 Hydrostatic Pressure Testing.............................................................................................................. 23

2.6 Chlorination ........................................................................................................................................ 24

2.7 Dechlorination .................................................................................................................................... 24

2.8 Sampling ............................................................................................................................................. 25

2.9 Installation of Closure Piece/Final Connection for New Watermain Physically Separated from the Distribution System ........................................................................................................................................ 26

2.10 Constructed, non-Commissioned Watermain .................................................................................... 27

2.11 Mandatory Submission ...................................................................................................................... 27

NEW WATERMAIN – CONNECTIONS GREATER THAN ONE PIPE LENGTH (SPECIAL CONDITION) ........... 40

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

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SERVICING TO CONDOMINIUMS / PRIVATE TOWN HOMES / INDUSTRIAL, COMMERCIAL, INSTITUTIONAL BUILDINGS........................................................................................................................................................... 46

4.1 Backflow Prevention & City Water Meter - (Permanent for the building) ....................................... 46

4.2 Private Side Testing ............................................................................................................................ 47

4.2.1 Installation and Certification: .................................................................................................... 47

4.2.2 Removal: .................................................................................................................................... 48

4.2.3 Exceptions: ................................................................................................................................. 48

4.3 Private Side (Plumbing Side) Commissioning ..................................................................................... 49

4.4 Final Connection................................................................................................................................. 49

4.5 Water Quality Flushing Program ........................................................................................................ 49

NEW DEVELOPMENT - WATER QUALIY FLUSHING PROGRAM ................................................................... 50

5.1 Implementing a Flushing Program ..................................................................................................... 50

5.1.1 Program Structure, Reporting & Obligations ............................................................................. 51

5.1.2 Regulatory Mandates and Obligations ...................................................................................... 51

5.2 Phasing out of Flushing Program ....................................................................................................... 51

CONTACT INFROMATION ........................................................................................................................... 55

REVISION HISTORY ...................................................................................................................................... 55

Figures, Diagrams, Charts & Forms

• Watermain Disinfection Checklist for Contractors & Subcontractors (Form)……………………..……………………14 • Backflow Preventer (BFP), Water Meter & By-Pass – Setup…………………………………………………………………… 19 • Backflow (RP), Test inspection Report (Form).…………………………………………………………………………………..20-21 • New Watermain Commissioning Schematic (Sample Points Allocation)…………………….....………………….……22 • Commissioning New Watermain – Physically Separated from Existing Watermain (Flow Chart…………28-29 • Contractor/Subcontractor Site Summary (Form)….……………………………………………………………………………30-34 • Watermain Disinfection Plan – Disinfection Criteria (Form).…………………………………………………………….…….35 • Watermain Disinfection Plan – Disinfection Site Map/Sketch (Form) …………………………………………………….36 • Watermain Disinfection Plan– Swabbing Plan/Sketch (Form)..……………………………………………………………….37 • Disinfection Records (Form) ……………………………………………….……………………………….…………………………………38 • Dechlorination/Discharge LOG (Form) ……………………………………………………………………………………………………39 • Exception for Connection Greater than one pipe length (Scenario/Example)………………………………………….42 • Commissioning New Watermain - Connection Greater than One Pipe Length up to 40m………………….43-44 • Exception Request Form…………………………………………………………………………………………………………………………45 • New Development Watermain Flushing Program – 3rd Party Chlorine Residuals/Consumption (Form)…..52 • Flushing Program – Request for Reduction or Cessation………………………………………………………………………...53 • Flushing Program – Consumption Calculation (Form)……………………………………………………………………………..54


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New Watermain Commissioning Requirements – Framework

Stage #1 - Designing

Site Plan Approvals (Design/Redesign)

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.

For more information Consult:

Development Engineering Department Infrastructure Delivery Department

If required, Complete appropriate Forms under Drinking Water Works Permit (DWWP) & Obtain approvals prior to start

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

Preconstruction Meeting

Engineering Department (Development Engineering / Infrastructure Delivery) Environmental Services (Water & Compliance) Developer Contractor(s) Consultant(s)


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

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Stage #2 - Disinfection Proposal Plan Submission

Requirements for Commissioning Contractors

Refer to “Watermain disinfection checklist for contractors & Subcontractors” (Page 14)

Requirements for 3rd party water quality flushing contractor

Refer to Section #5, “New Development – Flushing Program” (Page 50)

Mandatory Submission Submit all documents to Environmental Services – Supervisor of Water Division

Engineering Drawings 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.).

Commissioning/Disinfection Proposal The Proponent shall submit a disinfection proposal plan/documents to Supervisor of Water Division.

Provide a copy of MECP water operator licenses from Commissioning contractor (For all operators will be taking part in watermain commissioning activities)

Disinfection Proposal plan Exception Request Form – If required (For connections greater than one pipe length 6m to 40m Max)

New Development – Water Quality Flushing Program Proposal (if required for the site) The Proponent shall submit a Flushing Proposal plan to Supervisor of Water Division.

Provide a copy of MECP water licenses from Flushing contractor (For all operators will be performing Water Quality flushing)

Flushing Proposal plan


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Stage #3 – Commissioning

Mandatory site meeting required prior to start commissioning stage. (Proponent must arrange the meeting)

Developer(s) Contractor(s) Consultant(s) Engineering (Development Engineering / Infrastructure Delivery) Environmental Services (Water & Compliance)

NOTE:

Disinfection/Flushing Program Proposals: Review/Approval process requires 5 business days from submission. Re-submission may be required if any documents or information is missing. Another 5 business days will be required to review/approve re-submission.

Scheduling for Operators for commissioning activities must be scheduled through the Environmental Services Administration by providing a minimum of three (3) business day’s notification to the City.

Commissioning Process Responsible Developer/Contractor Development Engineering / Infrastructure Delivery ES- Water Division

Support ES-Compliance (Sampling, Clarification, Water Quality)

For more information refer to Section #2 (Page 15), Section #3 (Page 40) and Section #4 (Page 46) Note: Proponent is responsible to enquire and/or request the laboratory results from Environmental Services. Closure Piece/Final Connection & Water Quality Flushing Program (if required) Shall be

completed within 15 days from the last passing sample taken (Set #2). Failure to do so may require additional samples / re-commissioning


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Stage #4 - Final Assumptions/Water Quality

Water Quality Proponent is responsible for Water Quality at site

If required, commence approved Water Quality Flushing Program Shall be implemented within 15 days from the last passing sample taken (Set #2). Failure to do so may require additional samples / re-commissioning

Submit 3rd party Chlorine Residuals/Consumption Log sheet(s) weekly to [email protected]

Pay water usage invoice to city Follow City of Vaughan’s Water Quality flushing program criteria For flushing program reduction and cessation. Apply to Environmental Services for approval by

completing “Flushing Program – Consumption Calculation” Form and submit to [email protected] For more information refer to section #5 (Page 50)

Final Assumptions

Consult

Development Engineering Department Infrastructure Delivery Department Water Division


mailto:[email protected]


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Definitions

ANSI: American National Standards Institute

AWWA: American Water Works Association

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


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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)

MOH: Medical Officer of Health (York Region Public Health)

Non-commissioned: Watermain that is not in service and unavailable for distribution of potable/safe drinking water

NTU: Nephelometric Turbidity Unit

O.Reg.170/03: Ontario Regulation for Drinking Water Systems under Safe Drinking Water Act, 2002

Potable Water (AWWA): Does not contain objectionable pollutants or contaminants, and is considered satisfactory for Drinking or culinary purposes

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)

Proponent: Person or entity conducting work. For the purposes of this procedure, a Proponent can be either the “Consulting Engineer” for new developments and/or the “Contractor” for capital projects

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.

SAC: Spills Action Centre (Ministry of Environment)


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Safe Drinking Water Act, 2002: The Act recognizes that the people of Ontario are entitled to expect their drinking water to be safe and provides for the protection of human health and the prevention of drinking water health hazards through the control and regulation of drinking water system and drinking water testing

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. (Note: Last sample taken at Set #1 and First sample taken at set #2 at least 16 hrs. apart)

Service Connection: A point where a drinking water system connects to plumbing

Service Pipe: The pipe portion of a drinking water system that extends from a watermain to the property line of a property serviced by the watermain

Swab: A polyurethane foam plug used to clean watermain

Turbidity: Measured in NTU for Suspended particles in watermain

Live Taps/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

Watermain: means any system of pipes and appurtenances used for the distribution of drinking water, but does not include plumbing or a pumping facility

Watermain Disinfection Procedure: Document created by Ministry of the Environment, Conservation and Parks (MECP) for municipalities to follow under Ontario legislation and regulations related to Drinking Water


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NEW WATERMAIN COMMISSIONING REQUIREMENTS

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 Backflow Prevention: 177-2020 o Water: 177-2016 o Water Rates: 197-2020 & Wastewater Rates: 198-2020

Requirements apply to all watermains of any size, including temporary watermains. Service pipes of 100mm diameter and above shall be considered as watermain for the purposes of this procedure.

All new watermains 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 Proponent (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:

• Watermain Live Taps • Physical Separation • Isolation by a valve (Special Case) • Condominium, Commercial, Industrial, Private Townhomes, Institutional

ONLY City Side Distribution System (Service Line from Watermain to Property line Valve) Proponent is responsible for hiring competent contractor to commission Private side (Plumbing)


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1.2 Mandatory Submissions Submit all documents to Environmental Services – Supervisor of Water Division

Engineering Drawings 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

General Plan/Key Plan (No grading/landscaping, etc.)

Hard Copies (Mandatory) delivered to Joint Operation Center (JOC) City of Vaughan | Environmental Services – Water Division 2800 Rutherford Road, Vaughan ON L4K 2N9

• Four (4) copies of an 11 x 17 • Four (4) copies of a 24 x 36

Email Soft Copy (if available)

Commissioning/Disinfection Proposal The Proponent shall submit a disinfection proposal plan to Supervisor of Water Division.

Provide a copy of MECP water operator licenses from Commissioning contractor (For all operators will be taking part in watermain commissioning activities)

Disinfection Proposal plan Exception Request Form – If required (For connections greater than one pipe length 6m to 40m Max)

Plan(s) shall be reviewed and approved by Environmental Services (Water & Compliance) 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) Provide details on Chemicals used for disinfection (Shall meet AWWA and ANSI safety criteria standards NSF/ANSI/CAN 60)

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

d) Provide details on chemicals used for dechlorination and testing frequency e) 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.)


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NOTE: Review/Approval process requires 5 business days from submission. Re-submission may be required if any documents or information is missing. Another 5 business days will be required to review/approve re-submission.

New Development – Water Quality Flushing Program Proposal (if required for the site) The Proponent shall submit a Flushing Proposal plan to Supervisor of Water Division.

Provide a copy of MECP water licenses from Flushing contractor (For all operators will be performing Water Quality flushing)

Flushing Proposal plan

Plan(s) shall be reviewed and approved by Environmental Services (Water & Compliance) prior to any work commencing and will include:

a) Flushing Program shall include watermain dimensions, watermain length, flushing pints, discharge locations, Residual sampling locations

b) Flushing velocity, Directional flushing runs and Calculation of pipe volume for each flushing runs.

NOTE: Review/Approval process requires 5 business days from submission. Re-submission may be required if any documents or information is missing. Another 5 business days will be required to review/approve re-submission.

1.3 Commissioning Schedule Requests All requests for commissioning activities must be scheduled through the Environmental Services Administration by providing a minimum of three (3) business day’s notification to the City.

Environmental Services Administration @ 905-832-2281 x 6208 (During Business Hours from 8:00 AM to 4:00 PM)

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

1.4 Site Meetings Mandatory Site Meeting required prior to start commissioning (Proponent is responsible for arranging/coordinating with parties for the meeting)

Developer(s), Contractor(s), Consultant(s) Engineering (Development Engineering / Infrastructure Delivery) Environmental Services (Water & Compliance)



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Form available at https://www.vaughan.ca/services/residential/water/Pages/default.aspx Under “Contractor and new development information”


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

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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 commissioning activities must be scheduled through the Environmental Services Administration by providing a minimum of three (3) business day’s notification to the City.

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

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

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

2.1 Source

For By-Pass for New watermain projects, contractors have the following options to obtain source water

Live-Tap with valve to connect to the existing Water Distribution System (Recommended)

Cut in “T” with valve to connect to the existing Water Distribution System. (Recommended)

Existing Fire Hydrant – It will be the responsibility of the Proponent to demonstrate that Live Tap / Cut in “T” are not a viable option. Request will be reviewed on a case by case basis and shall be permitted to use Fire Hydrant as a source if hydrant is the only available option.

Shall follow Ministry’s Watermain Disinfection Procedure (cleaning/disinfection and maintain sanitary conditions during repair/installation). After completion, install By-pass with Backflow Preventer. Only city of Vaughan certified water Operators are authorized to Operate the Tapping sleeve valve/valve to flush, BFP Certification.



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2.1.1 Live Taps

The pipe surface at the location of the tap shall be cleaned and disinfected using a minimum 1% sodium hypochlorite solution. Where applicable, the drill/cutting/tapping bits and all surface of mainstops, service saddles, tapping sleeves, and valves which will come into contact with Drinking Water shall be cleaned and disinfected using 1% sodium hypochlorite solution immediately prior to installation. If any of the disinfected surfaces come into contact with the soil and/or water in the excavation prior to use, the cleaning and disinfection procedure shall be repeated.

Any live tap 2” (50mm) and above shall be pressurized at 150 psi (1034 kPa) for 30 minutes with no leaks. To ensure no leak between Watermain surface and service saddle prior to Live Tap.

City of Vaughan Certified operator shall witness all steps of this procedure (Disinfection, installation, pressure test and Live Tap)

Provide Watermain Tap-Coupon to Operator for inspection

2.1.2 Cut in “T” May require watermain shutdown and notification. At the time of scheduling

with the Environmental Services Administration, 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 Proponent for the shutdown to provide a minimum 48 hours notification to those that will be affected by the water service disruption.

Only city of Vaughan Certified operators are authorized to operate valves. City of Vaughan Certified operator shall witness pipe cutting/installation. The pipe surface shall be cleaned and disinfected using minimum 1% sodium hypochlorite solution. Where applicable, the couplings, fittings, pipe, valve, and all surface which will come into contact with Drinking Water shall be cleaned and disinfected using minimum 1% sodium hypochlorite solution immediately prior to installation. If any of the disinfected surfaces come into contact with soil and/or water in the excavation prior to use, the cleaning and disinfection procedure shall be repeated. Ensure that sanitary conditions are maintained during cutting and installation.


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2.1.3 Hydrant (Only if Live Tap / Cut-in-“T” are not a viable option)

Proponent to demonstrate that Live Tap / Cut in “T” are not a viable option. Request will be reviewed on a case by case basis and shall be permitted to use Fire Hydrant as a source if hydrant is the only available option.

Once approved, Proponent shall follow site specific hydrant disinfection and Microbiological sampling requirements prior to using Hydrant as source.

Consult Water Division for disinfection/sampling procedure.

2.2 Backflow Prevention Assembly The City of Vaughan only permits a Reduced Pressure Principle (RP) backflow preventer 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 (Page 19)

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.

2.2.1 Installation and Certification: 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 Reduced Pressure Principle Assembly is in compliance with the CSA B64 standard and will function properly.

RP Backflows are not permitted to be installed in a below grade structure (Chamber, trench, etc.). The bottom of the pressure differential relief vent must be between 750mm (minimum) and 1500mm (Maximum) above the potential flood plain. (Page 19)


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Only City of Vaughan prescribed backflow Preventer Test and Inspection reports will be accepted by the City. An example of this form is included in this document (Pages 20-21) and also found at vaughan.ca/WaterBackflow

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

Backflow preventers shall not be removed until completion of the commissioning project and without first notifying the City of Vaughan.

2.2.2 Removal:

Backflow and by-pass arrangement must remain at site till Closure Piece. Removal can be request but must be approved by the City prior to removal. Failure to comply may place the Proponent to recommission the site.

2.2.3 Exceptions:

As per the MECP Watermain Disinfection Procedure, if a backflow preventer is relocated within the same day, testing is only required for the first installation of the day provided that the backflow preventer is relocated by a Certified Operator who will guard against damage during transit and re-installation.

For the purposes of CSA Standard B64.10, a backflow prevention tester’s licence shall be an Ontario Water Works Association (OWWA) Certified Cross Connection Control Specialist Certificate or a Ministry-approved equivalent. In addition to the list of professionals in Table 1 of Figure E.1. of CSA Standard B64.10, a Certified Operator or a Water Quality Analyst with a backflow prevention tester’s licence shall also be authorized to test, install, relocate, repair or replace backflow preventers used in the installation and commissioning of new watermains.


http://www.vaughan.ca/waterbackflow

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Backflow Preventer (BFP), Water Meter & By-Pass - Setup

Note: Minimum By-Pass Size exempt for short section of Watermain up to 40 m

Revision (1.0): January 2021


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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 lines, branch connections and sample points • 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 reading shall be taken at each sample location (Page 22) and Hydrants, documented on the “Disinfection Record” (Page 38)

• 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 and relocated within the same day, testing is only required for the first installation of the day provided that the backflow preventer is relocated by a Certified Operator who will guard against damage during transit and re-installation. Documentation required on “Contractor/Subcontractor -Site Summary” (Page 30). Otherwise Backflow must be recertified prior to 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.


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• 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

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’ (Page 38).

2.7 Dechlorination • Appropriate chlorine high-count instrument to be used to verify high chlorine

concentration • Minimum 24hr Contact Time required

(last sample taken from the previous date to 1st sample taken after contact time) 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” (Page 38). All sample locations test results shall remain at least 60% from initial dose of chlorine to a maximum drop of 50 PPM (mg/L). If one of the sample locations fails, then entire site must be re-chlorinated

FAIL: Entire Watermain (including stubs, Hydrants, etc.) All water shall be neutralized before discharging (Dechlorinated as per AWWA C655-Field Dechlorination). Complete Dechlorination Log form (Page 39) 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). Complete Dechlorination Log form (See Page 39)

Flush watermain, take chlorine residuals at all sample points and discharge points. Ensure that Chlorine residuals at all sample points are at least 1.0 PPM (mg/L) or reflective of the City’s Water Distribution System. Record all readings on “Disinfection Record” (Page 38). Prepare for Sampling (Set #1)


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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) Record Final Chlorine residuals on “Disinfection Record” (Page 38). Set #1: Collected by City of Vaughan Certified Water Operator at 1(one) or

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

Set #2: Collected by City of Vaughan Certified Water Operator at 1(one) or more sample 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 (Note: Last sample taken at Set #1 and first sample taken at Set #2 must be minimum 16 hrs. apart)

• 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, Branch connections) (Page 22)

• Sample points shall be constructed with appropriate fittings • Coordination to obtain samples will be arranged by the Proponent • All microbiological samples will be conducted by City of Vaughan certified water

Operator • Note: If more than 2 sets (1 Round) of samples are required to obtain release of the

new watermain, the Proponent 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: 197-2020 & 198-2020 (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


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2.9 Installation of Closure Piece/Final Connection for New Watermain Physically Separated from the Distribution System • It shall be the responsibility of the Proponent to enquire and/or request the laboratory

results from Environmental Services. • Proponent shall coordinate with all parties in advance for the closure piece and book for

an appointment with Environmental Services Administration by providing a minimum of three (3) business day’s notification. 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

• If required, at the time of scheduling with the Environmental Services Administration, 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 Proponent 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 Backflow and By-Pass removal prior to closure piece. Earlier removal maybe approved by City with City of Vaughan certified water operator witnessing the process and properly secure the newly tested watermain without contaminating. Failure to comply may place the Proponent to recommission the site.

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

• City of Vaughan certified water operator shall witness Closure Piece/Final Connection. Proponent 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 minimum 1% sodium hypochlorite solution immediately prior to installation (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/final connection completed, valves opened to place a new watermain into service shall be operated by a City of Vaughan certified water operator. As a part of placing watermain into service, Flushing through the connection shall be performed by City of Vaughan water operator until Acceptable Disinfectant Concentration (chlorine residuals) is present in the new watermain. If required, take microbiological sample.


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• If applicable, commence approved Flushing program for the site. Proponent shall be responsible for New Development Flushing program from closure piece/final connection date as per City of Vaughan’s 3rd party flushing program Criteria. Refer to Section #5 (Page 50) for more information

• 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 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.

2.11 Mandatory Submission • Upon completion of the project, all proposals/forms specified in this document as part

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

Watermain Disinfection Checklist for Contractors & Subcontractors Backflow (RP), Test inspection Report Contractor/Subcontractor Site Summary Watermain Disinfection Plan – Disinfection Criteria Watermain Disinfection Plan – Disinfection Site Map/Sketch Watermain Disinfection Plan– Swabbing Plan/Sketch Disinfection Records Dechlorination/Discharge LOG

Note: Few forms are required to be submitted prior to commissioning for approval. Re-submit those forms with all other documents at end of the project


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Form available at https://w

ww

.vaughan.ca/services/residential/water/Pages/default.aspx

Under “Contractor and new

development inform

ation”



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NEW WATERMAIN – CONNECTIONS GREATER THAN ONE PIPE LENGTH (SPECIAL CONDITION)

Requests for connection greater than one pipe length and up to 40m (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 Proponent to demonstrate that isolation by a valve is the only available option. The decision of the City of Vaughan will be considered final.

Exception: Procedure may be used for installation and disinfection of Connections greater than one pipe length and up to total length 40m if the Connection:

A. Cross a transportation corridor, the extended closure of which could result in significant community impacts (Ex: Traffic congestion, loss of emergency access, Safety concerns), or

B. Cannot be constructed to within one pipe length of the existing watermain due to the potential for destabilizing an existing thrust block.

Procedure:

• Responsibility of the Proponent to review and apply by completing “Exception Request Form” (Page 45) in advance (prior to start of watermain commissioning) for Connection more than one pipe length and up to 40m. Submit the form to Environmental Services – Supervisor of Water Division

• Plan shall be reviewed by Environmental Services (Water & Compliance). Approval will be given only if site meets MECP criteria under Watermain Disinfection Procedure.

• Exception Request review/approval process requires 5 business days from submission. Re-submission may be required if any documents or information is missing. Another 5 business days will be required to review/approve re-submission.

• City of Vaughan certified water operator is required to witness all steps within this procedure. Installation of the connection to ensure that sanitary construction practices are followed, proper disinfection is performed. The new watermain and appurtenances forming the connection shall be hand swabbed with a minimum 1% sodium hypochlorite solution, immediately prior to installation.

• The Connection shall remain isolated from the existing Drinking Water System, except while being flushed or sampled, until satisfactory results are achieved Note: ONLY City of Vaughan Certified operators are authorized to operate the isolation valve.


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• The watermain must be flushed until a turbidity of less than 1.0 NTU is achieved. Two (2) consecutive sets of passing Microbiological Samples shall be taken at least 16 hrs. apart. During the 16 hrs. waiting time No Flushing shall take place and samples are representation of standing water in the watermain. (Note: Last sample taken at Set #1 and First sample taken at set #2 must be at least 16 hrs. apart)

• Hydrostatic testing (pressure testing) of the Connection shall not be undertaken against the isolation valve until satisfactory results from the Microbiological Samples referred to above are required. Hydrostatic testing shall be performed at 150 PSI for 2 consecutive hours, with no leaks and no additional water added once pressurized. Drinking Water shall be used for hydrostatic testing.

• After successful pressure test, schedule City of Vaughan Certified operator (within 15 days from last passing microbiological sample taken) to open valve fully and place new watermain in service. Flush new section and take chlorine residuals.

• If required commence approved Flushing Program to ensure water quality.

Note: For Microbiological Sample Failure

City will review Case by Case and provide guidelines to follow


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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). Proponent shall hire competent contractor 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 Proponent to demonstrate that physical separation is not an option at the property line and arrange for meeting with Environmental Service (Water & Compliance) and Engineering for amendment/approvals.

o Upon approval Proponent must submit site specific disinfection procedure to Environmental Services – Supervisor of Water Division

o Plan shall be reviewed and approved by Environmental Services (Water & Compliance) prior to any work commencing

4.1 Backflow Prevention & City 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 the following Department/Division for assistance Development Engineering or Infrastructure Delivery for more information

regarding design and installation


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

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Environmental Services – Backflow Prevention at https://www.vaughan.ca/services/residential/water/commercial_backflow_prevention_program/Pages/default.aspx For City of Vaughan Backflow Prevention Program Criteria

• 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.

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 and Certification: 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 Reduced Pressure Principle Assembly is in compliance with the CSA B64 standard and will function properly.

RP Backflows are not permitted to be installed in a below grade structure (Chamber, trench, etc.). The bottom of the pressure differential relief vent must be between 750mm (minimum) and 1500mm (Maximum) above the potential flood plain. (Page 19)


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

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


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Only City of Vaughan prescribed backflow Preventer Test and Inspection reports will be accepted by the City. An example of this form is included in this document (Pages 20-21) and also found at vaughan.ca/WaterBackflow

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

Backflow preventers shall not be removed until completion of the commissioning project and without first notifying the City of Vaughan.

4.2.2 Removal:

Backflow and by-pass arrangement must remain at site till Closure Piece. Removal can be request but must be approved by the City prior to removal. Failure to comply may place the Proponent to recommission the site.

4.2.3 Exceptions:

As per the MECP Watermain Disinfection Procedure, if a backflow preventer is relocated within the same day, testing is only required for the first installation of the day provided that the backflow preventer is relocated by a Certified Operator who will guard against damage during transit and re-installation.

For the purposes of CSA Standard B64.10, a backflow prevention tester’s licence shall be an Ontario Water Works Association (OWWA) Certified Cross Connection Control Specialist Certificate or a Ministry-approved equivalent. In addition to the list of professionals in Table 1 of Figure E.1. of CSA Standard B64.10, a Certified Operator or a Water Quality Analyst with a


http://www.vaughan.ca/waterbackflow

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backflow prevention tester’s licence shall also be authorized to test, install, relocate, repair or replace backflow preventers used in the installation and commissioning of new watermains.

4.3 Private Side (Plumbing Side) Commissioning • Proponent shall hire competent contractor to commission private side 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 shall be provided to the City within 15 days from the date the last satisfactory sample was taken

• It will be responsibility of the Proponent to book city of Vaughan certified water operator for valve operations for Clouse piece and water turn on.

4.4 Final Connection

• As per City of Vaughan’s Water By-Law & Backflow Prevention By-Law, Proponent is fully responsible to have the Backflow Preventer & City Water Meter in place at the time of water turn on.

• 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 or equivalent to Water Distribution System 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. Satisfactory Microbiological sample(s) result shall be received by the city within 15 days from the last sample taken. Closure Piece/ Final connection shall be completed by the 15th day of last satisfactory sample was taken. Failure to do so may require the commissioning procedure to be conducted again.

4.5 Water Quality Flushing Program

• For Pre-Service Lines for future development (Distribution – City Side). Proponent is fully responsible for implementing Water Quality flushing program till connection made to private side. For more information refer to Section #5 ()


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NEW DEVELOPMENT - WATER QUALIY FLUSHING PROGRAM

5.1 Implementing a Flushing Program • It is the sole responsibility of the Proponent 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 Proponent 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 recorded on 3rd party chlorine residuals and consumption form (see Page 52) for residuals/flushing events. Ensure combined chorine residuals are at least 1.0 mg/L or 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 Proponent 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.


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5.1.1 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 Proponent 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. • Every flushing and residual event shall be logged on City issued and MECP endorsed

document “New Development 3rd Party Chlorine Residual/Consumption” () For Residual events log in all residual points For Flushing events log in all Flushing Runs & all residual points Submit all 3rd party Chlorine Residual/Consumption sheets 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.

5.1.2 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 Administration) shall be notified immediately 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].

5.2 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. (Page 53)

• Flushing Program - Consumption calculations must be filled out to determine the watermain turnover rate (Page 54) and must be submitted with the request for program reduction/elimination. Requests can be made by email to [email protected]





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Form available at https://w

ww

.vaughan.ca/services/residential/water/Pages/default.aspx

Under “Contractor and new

development inform

ation”



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CONTACT INFROMATION

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

• Environmental Services Administration (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]

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 01-Feb-2021 4 Revised documents to incorporate MECP’s latest version of Watermain Disinfection Procedure. Updated City’s New Watermain Commissioning Requirements and Forms



NEW WATERMAIN COMMISSIONING REQUIREMENTS · 2021. 3. 24. · AWWA C655: American Water Works...

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