This section does not require that all of the information be recorded on a single form:. The affected watermain s may not be put back in service before the corrective actions and sampling plan are completed unless a Water Advisory is declared. Staged sampling shall be performed as follows: The sequence of actions may be varied as appropriate for the specific situation. The requirements in this section also apply to temporary watermains. This edition approved June The operating authority shall record the duration of disinfection, as well as the initial dose and remaining residual at the end of the contact time.
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If these awa concentrations cannot be achieved, Flushing shall continue until the disinfectant concentration at the point of Flushing is representative of the system residual in the awwwa area, determined by sampling upstream of the break area and downstream xwwa the Flushing location, or by using documented benchmarks awwa c651-99 the area, as long as free chlorine concentrations are at least 0.
If the water level in the excavation rises such that the Air gap is not maintained after flow from the break has been discontinued, then the watermain break shall be classified as Category 2. Watermain breaks awwa c651-99 evident or suspected Contamination are classified as Category 2. Appendix C Category 1 flowchart The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: Notification to c65-199 local Ministry office is not required for Category 2 watermain breaks unless: Longitudinal watermain break with evident Contamination.
Records have indicated consistent chlorine dosing andmostlysuccessful disinfections. Corrosion hole leak in a watermain with flow maintained until after an Air gap was created.
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In developing these procedures, operating authorities may use best management practices that go beyond the minimum requirements in this document. If there is evident or suspected chemical Contamination of a watermain, in addition to the procedures in sections 3.
The reporting and corrective actions of Schedule 16 and the awwa c651-99 Schedule 17 or 18 of O. Category 2 watermain breaks are not required to be reported to the Spills Action Awwa c651-99 unless an operating authority believes that contaminated water was directed to users.
Drinking water system operating authorities shall ensure that emergency repairs to watermains and Appurtenances are undertaken in accordance with this procedure by any person authorized to perform the repairs. These awwa c651-99 also apply to the planned maintenance of watermain Appurtenances and fittings refer to section 1.
Appendix B Tools to help determine the category of watermain break – pictures Examples of watermain breaks that are typical of Category 1 are included below for illustrative purposes only: Appendix E The following flowchart c6519-9 the requirements for special case Contamination sewage or chemical as a result of a watermain break. Skip to main content. Watermain repairs involving more than 6 metres of replaced pipe are also classified as Category 2.
In addition to the requirements described in section 3. This definition does not include recharging the watermain or a requirement to achieve scouring velocity within the watermain. Due to the chlorine demand exerted by the copper, no minimum awwa c651-99 concentration is required following the 24 hour contact time, and the effectiveness of the disinfection process awwa c651-99 be demonstrated by the Microbiological sampling referred to in section 1.
For relining of existing watermains, the conditions of section 1. Disinfectant residual on final post repair Flushing. The sampling plan shall include as a minimum taking two sets of Microbiological samples at least 24 hours apart.
Watermain disinfection procedure
The requirements in this section also apply to temporary watermains. Return to normal wwwa is contingent upon the corrective actions awwa c651-99 sampling plan being completed to the satisfaction of the local Ministry office in consultation with local Medical Officer of Health.
The disinfection requirements for new watermains as per Section 1. There is no requirement to undertake Microbiological sampling for Category 1 watermain break repairs. Contamination is typically not suspected for circumferential breaks or small leaks where flow is maintained from the break until an Air gap is established and where the Air gap is maintained during the repair procedure. For planned swabbing and hydraulic awwa c651-99. Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively.
Flushing velocities of 5fps awwa c651-99 be achieved at the following minimum flows4diameter gpm6diameter gpm8diameter gpm10diameter Appendix D The following flowchart is an example of the typical steps required for Category 2 watermain breaks. Staged sampling shall be performed as follows:.
Safety Practice for Water Utilities.