Specifications include, but are not limited to: Task 1 - Initial Survey The contractor will use specialized equipment to “listen” for sounds on direct contact points such as main line gate valves, fire hydrants, meter/curb valves, blow-offs, etc. The initial survey may be performed on contact points within the system provided that leak sounds travel the entire distance between contact points. If leak sounds may not be heard the entire distance between points as a result of pipe material, pipe diameter, contact point spacing, system pressure, soil type, equipment sensitivity, or any other factor, a ground microphone must be used to listen directly over the pipe at six to ten foot intervals in addition to listening to available contact points. The contractor must use a test rod and/or resonance plate in conjunction with the ground microphone in instances where the main is located more than three feet off of a hard surface. Task 2 - Pinpointing Phase In areas where leakage is detected, the contractor will first confirm the locations of mains and services through the use of maps and/or pipe locators. The contractor 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. Task 3 – Reporting - Daily Survey Logs and Final Project Reports The contractor will complete a daily survey log and indicate the location of leaks found on a map. Each leak that is identified will be classified according to estimated size and hazard to help facilitate repair by the water system. The contractor will meet with the designated representative of the water system on a daily basis and deliver survey logs from the previous day. At the conclusion of each survey, the contractor will prepare a final report and submit it to both the water system and the DEC. The report must include the daily survey logs, a breakdown of the rate of water loss by classification, a breakdown of the loss by source of leakage, and a summary of the project.
