Laserfiche WebLink
5 <br /> : ; �� .i c : • v ENVIRONMENTAL <br /> City of Decatur,IL SERVICES@ <br /> Project Approach and Understanding <br /> For this project,ADS would utilize a standard approach and methodology for an acoustic leak detection <br /> survey outlined by the AWWA and with details taken from the M-36 water loss control manual. Some of <br /> the highlights of this approach include: <br /> ✓ Comprehensive Leak Detection Survey—ADS will conduct a leak detection/location survey with <br /> sonic detection equipment on the entire distribution system over a 3-year period and as <br /> outlined in the RFP.Approximately 1/3 of the system will surveyed annually by making physical <br /> contact and listening on all hydrants and selected main line valves and b-box or service valves <br /> with highly sensitive sound intensifying instruments. <br /> ✓ Leakage Investigation and Pinpointing—In areas showing indications of leakage,or when the <br /> leakage technician suspects they may be hearing a leak through sound amplification,ADS will <br /> thoroughly investigate the mains and services with an electronic leak correlator to pinpoint the <br /> leak location for repair. All leak locations will be reported daily back to the City representative. <br /> ✓ Ground Listening Instrumentation-May be used when normal contact points are unavailable or <br /> cannot be created within a reasonable distance. If absolutely necessary,ADS may utilize probe <br /> rods and a sound amplification device to minimize listening distances during the survey. Probe <br /> Rods are rarely used in a modern leak survey,since industry leading sound amplification devices <br /> and leak correlators offer superior results,even when listening distances are greater than 30011. <br /> ✓ Systems Documentation—ADS will record all defective system components such as valves, <br /> hydrants and curb stops,as well as any map errors,that are noted in the course of carrying out <br /> other field activities. <br /> ✓ Project Deliverables—ADS will prepare a final report showing the results of all tests and <br /> investigations.The report will include the location and estimated quantity of leakage found and <br /> cost benefit analysis of the survey,as well as the inventory of defective system components and <br /> map errors. Leakage tickets will be submitted daily or every 2 days as outlined in the RFP. <br /> ✓ Emergency Leak Services—ADS and our leakage technicians are located in the State of Illinois, <br /> and our team can provide emergency leak services,as needed and as requested,and as <br /> emergency situations occur. <br />