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<br /> <br />~ <br /> <br /> <br />EN HILLS <br /> <br />MEMORANDUM <br /> <br />DATE: <br /> <br />September 25,2008 <br /> <br />TO: <br /> <br />Mayor and City Council <br />Ron Moorse, City Administrator <br /> <br />FROM: <br /> <br />Kristine Giga, Civil Engineer <br />Greg Hoag, Public Works Director <br /> <br />SUBJECT: <br /> <br />Smoke Testing <br /> <br />BACKGROUND <br /> <br />As part of the City's efforts to reduce Inflow and Infiltration (1&1), staff received quotes for a <br />consultant to complete smoke testing within a portion of the City. <br /> <br />Smoke testing is one technique being used to identify sources of inflow in the sanitary sewer <br />system. Smoke testing is most effective in detecting sources such as roof leaders, yard drains, <br />foundation drains, abandoned building sewers, faulty connections, illegal connections, and storm <br />water drainage system cross connections. It can also detect structural damage and leaking joints <br />in sewer pipes as well as overflow points in a sewer system. <br /> <br />The process for smoke testing is to blow smoke through isolated segments of the sanitary sewer <br />system. The segments are watched to determine if smoke is exiting anywhere, indicating the <br />potential for storm water to enter the sanitary sewer system. <br /> <br />Expenses incurred with smoke testing can be credited toward the City's 1&1 surcharge. <br /> <br />DISCUSSION <br /> <br />Staff has been working with Bonestroo to coordinate smoke testing work. Two proposals were <br />received to complete smoke testing in Met Council Meter 51 area, from Infratech and Visu- <br />Sewer, at $28,000 and $36,300 respectively. Meter 51 receives waste from two of the City's <br />sewersheds: Lift Station #4 (part of the 2006 PMP- Ridgewood neighborhood) and Lift Station <br /> <br />\ \M etro-ineLus\ardenhills\PR&PW\Engineeling\2008\Council _ Actions\9- 29-08M elTIO _ SlTIokeT esting.doc <br />