AWWA C651 STANDARD PDF
AWWA C Disinfecting Water Mains. Current; Document Language: English; Published By: American Water Works Association (AWWA). This standard presents essential procedures for the disinfection of new and repaired potable water mains. All new water mains shall be disinfected before they. FIELD CHLORINATION. • AWWA/ANSI C – Disinfecting Water Mains. • First standard approved Sept. 30, • Latest revision June 1.
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Where there is no discharge point to allow for Flushing, the operating authority shall tap the watermain on the downstream side of the break and discharge from that point. There is no requirement to undertake Microbiological sampling for Category 1 watermain break repairs.
Standsrd following flowchart is an example of the typical steps required for Category 2 watermain breaks. In developing these procedures, operating authorities may use best management practices that go beyond the minimum requirements in this document. The OIC will assess the evidence of Contamination or potential Contamination of the watermain before and during the repair procedure, and shall classify the break into one of two categories as per 3.
The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing. Upon completion of the excavation, the Operator-in-Charge OIC shall conduct a visual inspection to determine the nature of the break. Wwwa requirements in this section also apply to temporary watermains. Chain of custody Date and time of return to normal service Adwa Advisory declared: 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.
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The operating authority shall implement the plan as prescribed and the watermain cannot be put back in service until the cleaning, disinfection and sampling is completed as per the plan unless a Water Advisory is declared. Appendix C Category 1 flowchart The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: Disinfectant residual on final post repair Flushing. Longitudinal watermain break with evident Contamination.
With respect to new watermains, relined watermains and sfandard watermains, the provisions of this document, including sections 1. 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. In addition to the requirements described in section 3.
Appendix E The following flowchart depicts the standqrd for special case Contamination sewage or chemical as a result of a watermain break. Added, modified, replaced, extended; or Taken out of service for inspection, repair or other activities that may lead to Contamination, shall be disinfected before being put into service in accordance with the provisions of the AWWA C — Standard for Disinfecting Water Mains or an equivalent procedure.
Where copper pipe is used for standafd diameter watermains, Table 1 does not apply. Watermain breaks with no evident or suspected Contamination are classified as Category 1. Staged sampling shall be performed as follows: If, at any time, Contamination is evident or suspected, the break shall be reclassified as Category 2.
Category 1 watermain breaks are not defined as an observation of improper disinfection in accordance with Section of Schedule 16 of O. Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively.
Watermain disinfection procedure
Watermain repairs involving more than sstandard metres of replaced pipe are also classified as Category 2. Due standwrd the chlorine demand exerted by the copper, no minimum chlorine concentration is required following the 24 hour contact time, and the effectiveness of the disinfection process shall be demonstrated by the Microbiological sampling referred to in section 1. Operating authorities shall develop and document operating procedures for emergency watermain repairs within their systems.
The discharged water is deemed to be a Class II spill for the purposes of O.
AWWA C / AWWA C / AWWA C – Disinfection Of Water Package
Return to normal service is contingent upon the corrective actions and sampling plan being completed standad the satisfaction of the local Ministry office in consultation with local Medical Officer of Health. 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.
The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: Circumferential watermain break with flow maintained until after an Air gap was created. Category 2 watermain breaks are not required to be reported to the Spills Action Centre unless an operating authority believes that contaminated water was directed to users.
For relining of existing watermains, the conditions of section 1. Spiral watermain break with evident Contamination. If Contamination is evident or suspected, the procedures defined under section 3 for Category 2 watermain breaks shall apply. This section does not require that all of the information be recorded on a sandard form:.
The sampling plan shall include as a minimum taking two sets of Microbiological samples at least 24 hours apart. Skip to main content. The following flowchart depicts the requirements for special case Contamination sewage or chemical as a result of a watermain break. This procedure also establishes minimum standards for record keeping, and notification to the Ministry and the local Medical Officer of Health. Examples of watermain breaks that are typical of Category 2 are included below for illustrative purposes only: