AWWA C652 DOWNLOAD

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This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standards describe minimum requirements and do not . These standards (except ANSI/AWWA C) are developed and maintained under the direction of the AWWA Standards Committee on Steel Elevated Tanks. ANSI/AWWA C AWWA Standard for Disinfection of Awwa C profporwacipog.tk Free Download Here Finished Water Storage.


Awwa C652 Download

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Home; AWWA C Immediate download; $; Add to Cart Printed Edition + PDF; Immediate download; $; Add to Cart. Previews AWWA C Pre - Download as PDF File .pdf), Text File .txt) or read online. AWWA C This document is an American Water Works Association (AWWA) standard. .. ANSI/AWWA C—Disinfection of Water Storage Facilities.

Follow the steps described in section 3.

Contamination is typically not 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. If, at any time, Contamination is evident or suspected, the break shall be reclassified as Category 2.

Watermain repairs involving more than 6 metres of replaced pipe are also classified as Category 2.

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Operating Authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time. If an operating authority believes that contaminated water was directed to users, this will constitute an observation of improper disinfection in accordance with Section of Schedule 16 of O.

Operating authorities may choose to provide notification to, or seek advice from, the local Medical Officer of Health at any time.

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. After business hours, the operating authority shall contact the Spills Action Centre as soon as reasonably possible. Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively.

Awwa c652 11

The operating authority will attempt to maintain flow from the break, where possible, until an Air gap is established. Flow may be reduced by throttling valves while maintaining sufficient flow from the break to minimize the potential for Contamination. Flow may be discontinued after an Air gap has been created.

If the water level in the excavation rises such that the Air gap is not maintained after flow from the break has been discontinued, then the watermain break shall be classified as Category 2. Flushed water may be discharged from a hydrant, plumbing or Appurtenances.

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. Flushing shall continue until the discharged water is free from discoloration, and secondary disinfection has been restored as per 3.

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 discharged water is deemed to be a Class II spill for the purposes of O. Discharges of flushed water are also regulated under Condition 4.

If these disinfectant concentrations cannot be achieved, Flushing shall continue until the disinfectant concentration at 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.

Upon restoration of secondary disinfection, the system can be returned to normal service, defined as having all valves returned to normal operating position. Where the operating authority opts to undertake Microbiological sampling, samples shall be considered distribution samples within the meaning of O.

The flow shall be directed to ensure that the sample represents water that has passed through the location of the repair. The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing.

All samples shall be considered distribution samples, taken and tested in accordance with O. The reporting and corrective actions of Schedule 16 and the applicable Schedule 17 or 18 of O. The watermain may be returned to normal service defined as having all valves returned to normal operating position prior to receipt of sample results.

Flushed water may be discharged from a hydrant, plumbing or Appurtenances. 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.

Flushing shall continue until the discharged water is free from discoloration, and secondary disinfection has been restored as per 3. 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 discharged water is deemed to be a Class II spill for the purposes of O. Discharges of flushed water are also regulated under Condition 4. If these disinfectant concentrations cannot be achieved, Flushing shall continue until the disinfectant concentration at 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.

Upon restoration of secondary disinfection, the system can be returned to normal service, defined as having all valves returned to normal operating position.

Where the operating authority opts to undertake Microbiological sampling, samples shall be considered distribution samples within the meaning of O. The flow shall be directed to ensure that the sample represents water that has passed through the location of the repair.

The sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing. All samples shall be considered distribution samples, taken and tested in accordance with O. The reporting and corrective actions of Schedule 16 and the applicable Schedule 17 or 18 of O.

The watermain may be returned to normal service defined as having all valves returned to normal operating position prior to receipt of sample results. The sampling plan shall include as a minimum taking two sets of Microbiological samples at least 24 hours apart. 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.

Disinfection of Water-Storage Facilities

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. The disinfection requirements for new watermains as per Section 1. The operating authority shall finalize the plan in agreement with the local Ministry office in consultation with the local Medical Officer of Health.

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 the local Medical Officer of Health.

The information shall be retained as per the record keeping requirements of Section 27 of O. This section does not require that all of the information be recorded on a single form: Date Location e. If planned maintenance, indicate type of planned maintenance e. Pipe and Repair Parts disinfected?

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For Category 2 — Special Cases, include site specific plan. If chlorine disinfection was used, indicate initial concentration, contact time, final concentration and final concentration as percentage of initial concentration. Disinfectant residual on final post repair Flushing. If final disinfectant residual is less than 0.The watermain may be returned to normal service defined as having all valves returned to normal operating position prior to receipt of sample results.

Watermain repairs involving more than 6 metres of replaced pipe are also classified as Category 2. If final disinfectant residual is less than 0.

If an operating authority believes that contaminated water was directed to users, this will constitute an observation of improper disinfection in accordance with Section of Schedule 16 of O.

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This procedure also establishes minimum standards for record keeping, and notification to the Ministry and the local Medical Officer of Health.

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