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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Appendix E The following flowchart depicts the requirements for special case Contamination sewage or chemical as a result of a watermain break. Discharges of flushed water are also regulated under Condition 4. Flow may be discontinued after an Air gap has been created.
AWWA C / AWWA C / AWWA C – Disinfection Of Water Package
After the completion of Flushing and restoration of secondary disinfection, at least one Microbiological sample shall be collected and submitted as soon as reasonably possible, taking into consideration laboratory working hours and transportation timeframes. Flushing shall continue until the disinfectant concentration at the point of Flushing reaches at least 0. The sampling will typically occur at the point of Flushing, and awaa take place from sampling ports, hydrants, blow-offs, or premise plumbing.
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 qwwa the plan unless a Water Advisory is declared.
Mechanical removal of Contaminants; Flushing into the excavation; Higher velocity flushing after repairs where practical and feasible. Watermain repairs involving more than 6 metres of replaced pipe are also classified as Category 2.
These steps also apply to the planned maintenance of watermain Appurtenances and fittings refer to section 1. The sampling plan shall include as a minimum taking two sets of Microbiological samples at least 24 hours apart. This section does not require that all of the information be recorded on a single form: Operating authorities shall use Certified Operators for functions that must be performed by a Certified Operator.
Watermain breaks with no evident or suspected Contamination are classified as Category 1. Examples of watermain breaks that are typical of Category 2 are included below for illustrative purposes only:. Notwithstanding the conditions of section 1. Longitudinal watermain break with evident Contamination. When performing maintenance and repair activities as per sections 1.
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. In developing these procedures, operating authorities c6511 use best management practices that go beyond the minimum requirements in this document.
All samples shall be considered distribution samples, taken and tested in accordance with O.
Flushing shall continue until the discharged water is free from discoloration, and secondary disinfection has been restored as per 3. The disinfection requirements for new watermains as per Section 1.
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 operating authority shall finalize the plan in agreement with the local Ministry office in consultation with the local Medical Officer of Health.
Appendix D The following flowchart is an example of the typical steps required for Category 2 watermain breaks. With respect to new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1.
If planned maintenance, indicate type of planned maintenance e. 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 discharged water is deemed to be a Class II spill for the purposes of O. Follow the steps described in section 3. If chlorine disinfection was used, indicate initial concentration, contact time, final concentration and final concentration as percentage of initial concentration.
Flushing watermain cleaning, the requirements of section 3. The operating authority shall determine if flow can be maintained to the break site until the watermain is excavated.
For all other types of cleaning e. Where copper pipe is used for smaller diameter watermains, Table 1 does not apply.