Proposal - American Leak Detection - Detection of Leaks for SB Water Leak Survey

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M E Simpson Co., Inc. I Water I[ kstrulbutiion System Leak Detection Program Page 4 The Utility is encouraged to dig up and repair the leaks located as soon as possible so that the area may be re -surveyed while the Project Team is still working on the survey in that general geographical location to ensure no other leaks are present in that area. Equalpment Ust FCS S30 Gutermann AquaScolpe electronically enhanced listening device. 6 Echologics LeakFiindeir-ST w/hydirolphones; FCS AC Digitall, 'T'riCorr'Touch or Vivax-Metrotech HIL600OX leak correlator systems. RADIO Detection Line Locators. Chicago Tape, Fisher M.-Scope or Sclhorflstedt magnetic locators. A Ali necessary valve keys and hand tools b Truck mounted arrow board/signage and warning lights. Traffic control equipment, including properly sized traffic cones with reflective stripes. Quality ContrO and Accuracy of Leak Locatuons The level of accuracy of leak detection is a matter of taking in all the above considerations and applying those considerations to each individual potential leak location as it is being evaluated. Any statement made as to the level of accuracy of leak locations must be considered based on the individual conditions of each leak. Locating leaks on a distribution system can be very challenging. It is not a ,)erfecj,,L&JcMre. Pipes and fittings can leak for a variety of reasons (age, poor installation, material failures, bad soils, etc.), and the ability to locate leaks is dependent on the stated variables listed in the "Project Approach". By employing a strict methodology in the field for conducting a leak survey, these variables can be accounted for and mitigated. The depth of experience of the Project Team is extremely important to maintaining the ability to have accurate locations of leaks. Additionally, crews work as Two -Person Teams in the field, double checking the progress of the work as the survey progresses. The systematic procedure for leak confirmation has been stated in the Scope of Field Service and is restated here. "Suspected leak areas are always listened to a second time, preferably at a different time of day than originally listened to. The mains and services will be line located to insure correct pipe distances are used for the correlations. Correlations may need to be performed several times with several configurations to insure all the possible scenarios have been covered. Sewer manholes may need to be opened and flows observed. If there is any doubt as to the existence of a leak, the area may be checked and correlatedrat different times to rule out water usage or other factors. The progress of the survey will be monitored by the use of daily logs and a progression map with suspected leak noise indications marked and possible leak locations will be maintained. Field leak location forms will be turned into the Utility according to the agreed schedule. The Project Team will follow up on leak locations by monitoring the repair schedule of the Utility. That way in case a potential leak location is wrong, the Project Team can return to the site and determine why the leak location was incorrect, and correct it. This means maintaining a good level of communication between the Project Team in the field, and the Utility.