This document is an American Water Works Association (AWWA) standard. It is not a .. This foreword is for information only and is not a part of AWWA C AWWA C Disinfecting Water Mains. Current; Document Language: English; Published By: American Water Works Association (AWWA). AWWA C and these specifications. Disinfection requirements shall include preventive and corrective measures during construction, forms of chlorine and.
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Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively. For all other types of cleaning e.
Flushing shall continue until the disinfectant concentration at the point of 6c51 reaches at least 0. Added, modified, replaced, extended; or Taken out of service for inspection, awwx 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.
Notwithstanding the conditions of section 1. Drinking water system operating authorities shall ensure that emergency repairs to watermains zwwa Appurtenances are undertaken in accordance with this procedure by any person authorized to perform the repairs. Chlorine Concentrations and Contact Times for New Watermains C51 levels over 10 milligrams per litre, a measurement of total chlorine shall be deemed to be equivalent to a measurement of free chlorine.
The sequence of actions may be varied as appropriate for the specific situation. With respect to new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1. For planned swabbing and hydraulic e. If, at any time, Contamination is evident or suspected, the break shall be reclassified as Category 2. After business hours, the operating authority shall send an e-mail to the e-mail address specified by local Ministry office no later than 10 AM the next business day; or in zwwa Special Cases described in sections 3.
The operating authority shall determine if flow can be maintained to the break site until the watermain is excavated. Staged sampling shall be performed as follows: In developing these procedures, operating authorities may use awws management practices that go beyond the minimum requirements in this document.
The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: Example 3 When using the slug method of chlorination, with a minimum contact time of 3 hours, the chlorine concentration shall be measured in the slug at the beginning of the disinfection process, as the slug moves through the watermain, and at the point of discharge.
Notification to the local Ministry office is not required for Category 2 watermain breaks unless: Awqa breaks with evident or suspected Contamination are classified as Category 2. Excavation dewatering shall be continued for the duration of the repairs such that awa Air gap between the location of the break in the watermain and the water in the excavation is maintained.
Dechlorination of discharged water is required for any water that is directed into surface water or if the discharge into the natural environment causes or is likely to cause an adverse effect, as per Condition 10 of Schedule B of the Municipal Drinking Water Licence. 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: Operating Authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time.
Flow may be reduced by throttling valves while maintaining sufficient flow from the break to minimize the potential for Contamination. Flushed water may be discharged from a hydrant, plumbing or Appurtenances.
Operating authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time. Return to normal service is contingent upon the corrective actions and sampling plan being completed to the satisfaction of the local Ministry office in consultation with local Medical Officer of Health.
Watermain disinfection procedure
Pipe and Repair Parts disinfected? If planned maintenance, indicate type of planned maintenance e.
The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise c6551. Share facebook twitter Print.
Watermain disinfection procedure |
This procedure uses a risk management approach to categorize watermain breaks based on the potential for Contamination. When performing maintenance and repair activities as per sections 1.
If an c51 authority believes that contaminated water was directed to users, this will constitute an observation of improper disinfection in accordance with Section c615 Schedule 16 of O. Watermain repairs involving awwz than 6 metres of replaced pipe are also classified as Category 2. The operating authority will attempt to maintain flow from the break, where possible, until an Air gap is established.
For Category 2 — Special Cases, include site specific plan. The disinfection requirements for new watermains as per Section 1. Examples of watermain breaks that are typical of Category 2 are included below for illustrative purposes only:.
The operating authority shall finalize the plan in agreement with the local Ministry office in consultation with the local Medical Officer of Health.
AWWA C / AWWA C / AWWA C – Disinfection Of Water Package
The procedures are required to be followed in order to satisfy conditions imposed by the Director in a drinking water works permit. This procedure also establishes minimum standards for record keeping, and notification wawa the Ministry and the local Medical Officer of Health.
Refer to Appendices A and B for a flowchart and pictures to better understand the criteria to determine the categories of watermain breaks.
Flushing shall be conducted following repairs by creating a temporary dead end downstream of the break through valve operation, and Flushing through the location of the awwwa to a discharge point.
Corrosion hole leak in a watermain with flow maintained until after an Air gap was created. Flushing shall continue until the discharged water is free from discoloration, and secondary disinfection has been restored as per 3.
This document outlines procedures for disinfecting water mains as part of an addition, modification, replacement, extension, planned maintenance, or emergency repair in a municipal residential drinking water system.
Examples of watermain breaks that are typical of Category 1 are included below for illustrative purposes only:. When using the slug method of chlorination, with a minimum contact time of 3 hours, the chlorine concentration shall be awwwa in the slug at the beginning of the disinfection process, as the slug moves through the watermain, and at the point of discharge.
Chain of custody Date and time awwq return to normal service Water Advisory declared: Service pipes of mm diameter and greater shall be considered as watermains for the purposes of this procedure. These steps also apply to the planned maintenance of watermain Appurtenances and fittings refer to section 1. Appendix C Category 1 flowchart The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: Follow the steps described in section 3.
In addition to the procedures in 3.