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Public Works Memorandum <br /> NO. 2011-60 <br /> DATE: August 25,2011 <br /> TO: Honorable Mayor McElroy and City Council <br /> FROM: Ryan P. McCrady, City Manager <br /> Richard G. Marley, P.E., Public Works Director <br /> SUBJECT: 2011 Sanitary Sewer Herbicide Root Control, City Project 2011-31 <br /> SUMMARY RECOMMENDATION: <br /> It is recommended that the City Council approve the attached resolution awarding the contract in <br /> the amount of$83,369.02 for 2011 Sanitary Sewer Herbicide Root Control, City Project 2011- <br /> 31, to National Power Rodding Corp., as the lowest qualified bidder and that the Mayor be <br /> authorized to execute the contract and the City Clerk to attest. <br /> PRIOR COUNCIL ACTION: <br /> The City Council approved the FY 2011-12 Capital Improvements Plan which allocated funds <br /> for this project. <br /> BACKGROUND: <br /> Sanitary Sewer Priorities <br /> Under the direction of the City Council, the Public Works Department has established four <br /> priorities to improve the City's sanitary sewer collection system as defined in the Sanitary Sewer <br /> Master Plan. <br /> 1. Critical Large Diameter Sewer Rehabilitation. <br /> 2. Sanitary Sewer Overflows Due to Inflow and Infiltration. <br /> 3. System Operation and Maintenance <br /> 4. Small Diameter Sewer Rehabilitation <br /> The 2011 Sanitary Sewer Herbicide Root Control Project primarily addresses priority number 3 <br /> by removing the roots in the sewer. Secondarily, the work also addresses priority 2 by helping to <br /> restore the full capacity of the pipe which will decrease the amount of sanitary sewer overflows <br /> and basement backups. However, root intrusion into the sewer is a sign of infiltration and simply <br /> removing the roots does not reduce infiltration. <br /> 2011 Sanitary Sewer Herbicide Root Control Project <br /> Sanitary sewer lines are extremely susceptible to root intrusion due to the type of pipes <br /> historically used for construction of sanitary sewers and the tenacity of tree roots which push into <br /> sanitary sewers to find a source of year round moisture. The roots penetrate sanitary sewers <br /> through joints, service laterals, connections and cracks in search of water. Without removal the <br /> Page I 1 <br />