Specifications include, but are not limited to: 1. Review the distribution maps of the system and tie records for familiarization of the pipe network and available appurtenances (valves, services, hydrants, etc.) to be used for contact points. 2. Conduct a kick-off meeting with the WWCo to cover the goals of the project and outline work procedures. The field crew will meet daily or as agreed upon, with assigned WWCo personnel to go over areas of the leak detection program for the prior workday, and plans for current day and areas to survey. 3. All CONSULTANT Field Staff will have readily-observable identification badges and high-visibility vests worn while in the field. 4. As the leak survey progresses, the Consultant shall determine the distance that even quiet leak sounds travel in various pipe materials, pipe sizes and pressure zones in each area of the system. This is to be done by slightly turning on fire hydrants, hose bibs, etc., creating a simulated quiet leak sound. Appurtenances in that area are then to be checked with a sound amplification instrument to see how far the simulated leak sound travels, thus determining how often the Consultant will make contact with appurtenances in a given section of the water distribution system 5. The leakage survey shall be a complete leak detection of the entire water distribution system through listening to all accessible main line valves, fire hydrants, water services and needed appurtenances to ensure complete coverage of the system. Valves, hydrants, service valves or meter settings will be used with preference of listening points in order as follows; direct contact with the pipe, main line valves, hydrant valves, hydrants, then service valves or meter settings. There shall be a minimum of two (2) persons working on the survey at all times. The Consultant shall use a sonic leak detection sound amplification instrument designed for this purpose with a transducer rated at a minimum sensitivity of 1.5 VG (volt per gain) or greater. (When surveying PVC or PE pipe lines, the consultant shall make contact with all available appurtenances.) 6. The leak detection equipment to be used shall be that which is described in the “Equipment to be Used” Section below. 7. Survey the above appurtenances to locate leaks, ensuring that distances between listening points are not greater than 300’ on metallic and concrete type pipes and no more than 150’ on PVC and HDPE type pipes, or at pre-determined distances as noted above (whichever distance is less). This allows for even quiet leaks to be located. 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, sonic ground listening instruments must be used in addition to listening to available contact points. 8. When normal contact points are not available or cannot be created within a reasonable distance as described above, Consultant shall use a sonic ground listening device making physical ground contact at intervals no greater than 6 feet directly over the pipe. If excessive ambient noise precludes the effectiveness of the ground listening device in an area during daytime hours, Consultant shall schedule this portion of the survey for nighttime hours. Consultant shall pre-approve these situations with the WWCo. (sonic ground listening instruments are to be used only when ground cover is pavement, cement or similar hard surface). 9. When ground cover is not a hard surface or where the main is located more than three feet off of a hard surface, probe rods and/or resonance plate in conjunction with the sonic ground listening device in instances shall be used at 10 feet intervals when normal contact points are not available (as described in Paragraph above). A sound amplification instrument with 1.5 VG (volts per "G") or greater transducer minimum output is to be used on probe rods. Probe rods will be driven into the ground a minimum of 6" directly over the pipe when ground conditions allow. 10. A detailed report of decibel levels at suspected leak sound locations and observations are to be compiled during the survey for reinvestigation and possible pinpointing at a later time. When leak noise has been detected and or suspected, at least four hours shall pass between the initial investigation of the area before a reinvestigation and confirmation is attempted. This reinvestigation is to increase the speed of the survey and should eliminate correlating on most false leak sounds. 11. Use a microprocessor-based leak correlator to pinpoint the locations of leaks found. Correlated leaks shall be prioritized according to condition and criticality. Other information related to that correlation will be included as part of the field sheet such as the filters used for the correlation, line locations, distances between sensors, etc. 12. The leak location shall be marked in the field (on the surface) using environmentally formulated Precautionary Blue paint. 13. It may be necessary to conduct parts of the Leak Survey during “off hours” such as at night. This may be required in areas of high traffic volume where traffic noise may affect the ability to detect leak noise, and traffic volume may affect the ability of the Contractor to be able to safely access main line valves in the middle of the street. The Contractor shall give 24-hour advanced notice of intent to survey a particular area that may require after hours surveying or nighttime surveying. 14. At the end of each day, or as requested, provide a list of any leaks located, locations of the leaks by diagram, and an estimation of leakage rates. Information collected by the CONSULTANT during the leak detection program and any other information provided by the WWCo shall be regarded as confidential and will not be shared without permission from the WWCo. 15. Whenever the WWCo repairs any leaks detected by the Consultant prior to completion of the field work, the Consultant shall re-survey that section of the system, to be sure no very quiet leaks are missed due to an overpowering noisy leak sound.