AWWA C651-05 DISINFECTING WATER MAINS PDF

Mibar The chlorinated water shall remain in the pipe for at least 24 hr. It shall be delivered to the job in closed containers and shall be kept clean and applied with dedicated clean applicators. This hose must be removed during the hydrostatic pressure test. Figure 1 applies to pipes with diameters 4 in.

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Kagagor Operating Authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time. Discharges of flushed water are also regulated under Condition 4. Chlorine Concentrations and Contact Times for New Watermains At levels over 10 milligrams per litre, a measurement of total chlorine shall be deemed to be equivalent to a measurement of free chlorine.

If, at any time, Contamination is evident or suspected, the break shall be reclassified as Category 2. Watermain disinfection procedure Share facebook twitter Print. The reporting and corrective actions of Schedule 16 and the applicable Schedule 17 or 18 of O. Disinfectant residual on final post repair Flushing. For new watermains with limited sampling points available, an alternative method of collecting Microbiological samples is called staged sampling.

Tags Environment and energyDrinking water. Staged sampling shall be performed as follows:. Where there is no discharge point to allow for Flushing, the operating authority shall tap the watermain on standrd downstream side of the break and discharge from that point.

Flushing shall continue until the discharged water is free from discoloration, and secondary disinfection has stnadard restored as per 3. These steps also apply to the planned maintenance of watermain Appurtenances and fittings refer to section 1. Upon restoration of secondary disinfection, the system can be returned to normal service, defined as having all valves returned to normal operating position.

Operating authorities shall develop and document operating procedures for emergency watermain repairs within their systems. All samples shall be considered distribution samples, taken and tested in accordance with O.

Watermain breaks with evident or suspected Contamination are classified as Category 2. With respect standarrd new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1.

There is no requirement to undertake Microbiological sampling for Category 1 watermain break repairs. Contamination is typically ztandard 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.

The following flowchart depicts the requirements for special case Contamination sewage or chemical as a result of a watermain break. The sequence of actions may be varied as appropriate for the specific situation.

The operating authority will attempt to maintain flow from the break, where possible, until an Air gap is established.

Examples of typical steps for Category 1, 2 and stancard special cases are attached as Appendices C, D and E respectively. Notwithstanding the conditions of section 1. This section does not require that all of the information be recorded on a single form:. 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.

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. The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing.

The procedures are required to be followed in order to satisfy conditions imposed by the Director in a drinking water works permit.

In developing these procedures, operating authorities may use best management practices that go beyond the minimum requirements in this document. 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.

Chain of custody Date and time of return to normal service Water Advisory declared: 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.

After business hours, the operating authority shall contact the Spills Action Centre as soon as reasonably possible. 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.

For relining of existing watermains, the conditions of section 1. Watermain breaks with no evident or suspected Contamination are classified as Category 1.

Follow the steps described in section 3. Longitudinal watermain break with evident Contamination. 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.

Operating authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time. Appendix D The following flowchart is an example of the typical steps required for Category 2 watermain breaks. Appendix E The following flowchart depicts the requirements for special case Contamination sewage or chemical as a result of a watermain break. TOP Related Posts.

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