Specifications include, but are not limited to: The work will consist of performing acoustic listening surveys on the distribution systems of the water systems selected from the list in Appendix A, as well as coordinating with those systems to schedule the surveys and meet with system personnel as needed. Because the scope of work is extensive, proposals for portions of the survey work will be accepted, and multiple contractors may be hired.; A. Task 1 - Initial Survey The leak detection firm (“firm”) will utilize specialized equipment to “listen” for sounds on direct contact points including, but not limited to, main line gate valves, fire hydrants, meter/curb valves, and blow-off valves. B. Task 2 - Pinpointing Phase In areas where leakage is detected, the firm will first confirm the locations of mains and services through the use of maps and/or pipe locators. The firm will then perform an intensified pattern of sonic tests directly over the mains and services to identify the location of the leak. An electronic digital leak noise correlator may be used as a pinpointing tool, but a ground microphone shall be used to confirm the correlator results. In the case where a leak is suspected to be associated with a hydrant, the hydrant will be isolated, and additional listening on contact points or over the pipe will be conducted to rule out other types of leaks.
