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April 13, 2009 Item No. 7I <br />Page 3 <br />Potential for Slip Lining for Permanent Root Control <br />The permanent approach to root control would be to slip line the pipes. The <br />permanent solution would require greater initial capital expenditure, but would <br />save money in the long term. The City has not yet developed a comprehensive <br />program for slip lining the sanitary sewer. However, the Public Works <br />Department did include some amount of funds in the approved 2009 budget for <br />slip lining and sanitary sewer main rehabilitation. The sewer lines to be slip lined <br />for 2009 have not yet been determined. <br />The Street and Utility Improvement Program provides an opportunity for the City <br />to consider performing permanent root control on the sanitary sewer mains within <br />the project areas, through slip lining. Slip lining could also be done after the <br />streets have been reconstructed, but it would be preferred to perform the slip <br />lining either as part of or in advance of each individual project in the Program. <br />While slip lining is a non-intrusive operation, there is always a very small chance <br />that an unforeseen condition encountered during the work could require the <br />sewer main to be excavated. <br />Public Works Staff has reviewed the sanitary sewer lines located within the <br />2009-2010 Street and Utility Improvement Project area, and have identified that <br />41 segments of sanitary sewer in the project area are currently being treated for <br />roots. The total length of these segments is approximately 12,265 feet. For <br />reference, there are 81 total segments of sanitary sewer in the project area. <br />The 41 sewer segments identified in the 2009-2010 Street and Utility <br />Improvement Project area would be the logical candidates towards which to <br />apply the budgeted funds for slip lining in 2009. The sewer segment already <br />identified for slip lining in the 2009-2010 Project is one of the 41 segments. Of <br />the remaining 40 segments, there are 8 in which a spot repair is proposed under <br />the 2009-2010 Project. These would be good choices for slip lining, since in <br />addition to root control these segments also have either cracked pipes or leaking <br />joints. If the slip lining were performed on these 8 segments, the spot repairs <br />would not be necessary. <br />For the remaining 32 segments of sewer in the 2009-2010 Project area that are <br />being treated for roots, the Public Works Staff has ranked them in order of <br />severity of the roots.