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3. SYSTEM WATER AUDITS, LEAK DETECTION AND REPAIR

A. Implementation

Implementation shall consist of at least the following actions:

1) Annually complete a prescreening system audit to determine the need for a fullscale system audit. The prescreening system audit shall be calculated as follows:

a) Determine metered sales;

b) Determine other system verifiable uses;

c) Determine total supply into the system;

d) Divide metered sales plus other verifiable uses by total supply into the system. If this quantity is less than 0.9, a fullscale system audit is indicated.

2) When indicated, agencies shall complete water audits of their distribution systems using methodology consistent with that described in AWWA#146;s Water Audit and Leak Detection Guidebook.

3) Agencies shall advise customers whenever it appears possible that leaks exist on the customer’s side of the meter; perform distribution system leak detection when warranted and cost-effective; and repair leaks when found.

B. Implementation Schedule

1) Agencies signing the MOU prior to December 31, 1997, implementation shall commence no later than July 1, 1998.

2) Agencies signing the MOU or becoming subject to the MOU after December 31, 1997, implementation shall commence no later than July 1 of the year following the year the agency signed or became subject to the MOU.

C. Coverage Requirements

1) Agency shall maintain an active distribution system auditing program.

2) Agency shall repair identified leaks whenever cost-effective.

D. Requirements for Documenting BMP Implementation

1) Prescreening audit results and supporting documentation;

2) Maintain in-house records of audit results or the completed AWWA Audit Worksheets for each completed audit period.

E. Criteria to Determine BMP Implementation Status

1) Agency has annually completed a pre-screening distribution system audit.

2) Agency has conducted a full system audit consistent with methods described by AWWA’s Manual of Water Supply Practices, Water Audits and Leak Detection whenever indicated by a pre-screening audit.

F. Water Savings Assumptions

Unaccounted water losses assumed to be no more than 10% of total water into the water supplier’s system.