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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If final disinfectant residual is less than 0. Upon completion of the excavation, the Operator-in-Charge OIC shall conduct a visual inspection to determine the nature of the break. This procedure uses a risk management approach to categorize watermain breaks based on the potential for Contamination. 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.
Notification to the local Ministry office is not required for Category 2 watermain breaks unless: Additional steps shall be undertaken as appropriate to remove Contaminants from the watermain, such as:. The flow shall be directed to ensure that the sample represents water that has passed through the location of the repair.
Watermain disinfection procedure |
If planned maintenance, indicate type of planned maintenance e. The reporting and corrective actions c61 Schedule 16 and the applicable Schedule 17 or 18 of O. 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. 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.
Operating authorities shall use Certified Operators for functions that must be aawwa by a Certified Operator.
Disinfectant residual on final post repair Flushing. The discharged water is deemed to be a Class II spill for the purposes of O. Tags Environment and energyDrinking water.
For all other types of cleaning e.
In addition to the requirements described in section 3. Share facebook twitter Print. The watermain may be returned to normal service defined as having all valves returned to normal operating position prior to receipt of sample results. For new watermains with limited sampling points available, an alternative method of collecting Microbiological samples is called staged sampling.
AWWA C / AWWA C / AWWA C – Disinfection Of Water Package
If there is evident or suspected sewage Contamination of a watermain, in awwq to the procedures in sections 3. 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.
Watermain breaks with no evident or suspected Contamination are classified as Category 1. Operating authorities shall develop and document operating procedures for emergency watermain repairs within their systems.
If chlorine disinfection was used, indicate initial concentration, contact time, final concentration and final concentration as percentage of initial concentration.
Watermain disinfection procedure
The procedures are required to be followed in order to satisfy conditions imposed by the Director in a drinking water works permit. The local Ministry office shall be notified as soon as reasonably possible during business hours.
Operating authorities may choose to provide notification to, or seek advice from, the local C6651 Officer of Health at any time. This section does not require that all of the information be recorded on a single form:. 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 c6651 through the watermain, and at the point of discharge.
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. If an operating authority believes that contaminated water was directed to users, this will constitute an observation of improper disinfection in accordance with C65 of Schedule 16 of O.
Example 3 Awa 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. 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.
Contamination is typically not suspected for circumferential breaks or small leaks x651 flow is maintained from the break until an Air gap is established and where the Air gap is maintained during the repair procedure. Return to normal service awaw contingent upon the corrective actions and sampling plan being completed to the satisfaction of the local Ministry office in consultation with the local Medical Officer of Health.
Flushing shall continue until the disinfectant concentration at the point of Flushing reaches at least 0.