AWWA C651 PDF

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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Discharges of flushed water are also regulated under Condition 4. 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: The watermain may be returned to normal service defined as having all valves returned to normal operating position adwa to receipt of sample results. Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively.

If planned maintenance, indicate type of aqwa maintenance e. If Contamination is evident or suspected, the procedures defined under section 3 for Category 2 watermain breaks shall apply.

Follow the steps described in section 3. Operating authorities shall develop and document operating procedures for emergency watermain repairs within their systems. If these disinfectant concentrations cannot be achieved, Flushing shall continue until the disinfectant concentration awaa the point of Flushing is representative of the system residual in the break area, determined by sampling upstream of the break area and downstream at the Flushing location, or by using documented benchmarks for the area, as long as free chlorine concentrations are at least 0.

Excavation dewatering shall be continued for the duration of the repairs such that the Air gap between the location of the break in the watermain and the water in the excavation is maintained. The operating authority shall finalize the plan in agreement with the local Ministry office in consultation with the local Medical Officer of Health.

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Watermain disinfection procedure |

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. The flow shall be directed to ensure that the sample represents water that has passed through the location of the repair.

Mechanical removal of Contaminants; Flushing into the excavation; Higher velocity flushing after repairs where practical and feasible.

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 the Special Cases described in sections 3. Flushing shall continue until the disinfectant concentration at the point of Flushing reaches at least 0.

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 repair to a discharge point. Category 1 watermain breaks are not defined aww an observation of improper disinfection in accordance with Section of Schedule 16 of O. The procedures are required to be followed in order to satisfy conditions imposed by the Director in a drinking water works permit.

With respect to new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1.

Share facebook twitter Print. Circumferential watermain break with flow maintained until after an Air gap was created. Flow may be discontinued aww an Air gap has been created. The following flowchart is an example of the typical steps required for Category 2 watermain breaks. Notification to the local Ministry office is not required for Category 2 watermain breaks unless:.

AWWA C / AWWA C / AWWA C – Disinfection Of Water Package

The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing. Tags Environment and energyDrinking water. 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. Skip to main content. All samples shall be considered distribution samples, taken and tested in accordance with O.

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If there is evident or suspected sewage Contamination of a watermain, in addition to the procedures in sections 3.

Watermain disinfection procedure

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. If final disinfectant residual is less than 0. The affected watermain s may not be put back in zwwa before the corrective actions and sampling plan are completed unless a Water Advisory is declared. 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.

Longitudinal watermain break with evident Contamination.

Flow may be reduced by throttling valves while maintaining sufficient flow from the break to minimize the potential for Contamination. The disinfection requirements for new watermains as per Section 1.

The following steps must be performed for all emergency watermain repairs Category 1 and Category 2.