R2005-157 ACCEPTING THE BID AND AUTHORIZING A CONTRACT

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. � COUNCIL COMMUNICATION FORM Engineering& Infrastructure Memorandum NO. 2005-69 November 1, 2005 TO: Honorable Mayor Osborne and City Council FROM: Steve Garma ity Manager Stephen Swa , P.E.,Director of Engineerin & Infrastructure� Matthew C. Newell, P.E., City Engineer�,�� Douglas R. Nooden,Assistant City Engineer SUBJECT: Sanitary Sewer Herbicide Root Control, City Project OS-20 SUMMARY RECOMMENDATION: It is recommended by staff that the City Council approve the attached resolution awarding the contract for Sanitary Sewer Herbicide Root Control, City Project OS-20, to Tele Scan, Inc., as the lowest, responsible bidder in the amount of$63,070.35, and that the Mayor be authorized to execute the contract, and the City Clerk to attest. BACKGROUND: Sanitary sewer lines are extremely susceptible to root intrusion due to the type of loose jointed pipes historically used for construction of sanitary sewers, and the proximity of trees that have been planted in or near the right of way. Root growth easily extends through backfill materials to find an attractive source of year round moisture within the trench line. Roots ultimately penetrate the joints and cracks of sewers in search of water and grow to fill the main, trapping solids and impeding flow, thereby creating a significant source of sewer backups. The project consists of the application of a root herbicide to retard and eliminate any root growth present in the target lines. The herbicide chemical is combined with a foaming agent that is applied by means of jetting equipment to the inside of the sewer pipe. Foam fills the pipe and causes the herbicide to cover and stick to any tree roots that it comes in contact with. The herbicide proceeds to kill the roots that are in the pipe and within a short distance of the outer wall while leaving the main tree structure undamaged. Project locations have been determined through the evaluation of televised sewer inspection reports and videos. The herbicide root control program is intended to supplement root cutting work performed by City maintenance crews. The project plans and specifications were prepared by Engineering Division staff. The project was advertised October 18, 2005, and bids were opened on October 31, 2005. The results for the letting are as follows: