R2015-86 CONTRACT FOR 2015 ANNUAL WATER MAIN REPLACEMENT

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Water Management Memorandum No. 2015-09 DATE: June 24, 2015 TO: Honorable Mayor McElroy and City Council FROM: Tim Gleason, City Manager Keith Alexander, Director of Water Management Jerry Stevens, Engineering Services Coordinator SUBJECT: Annual Water Main Replacement Project, City Project 2015-10 SUMMARY RECOMMENDATION: City Council approve the attached resolution awarding the contract for the Annual Water Main Replacement Project, City Project 2015-10, to Burdick Plumbing & Heating Company, Inc. in the amount of$1,246,190 and that the Mayor be authorized to execute the contract, and the City Clerk attest. BACKGROUND: Project Description The City's Annual Water Main Replacement project targets water main segments throughout the City experiencing high rates of main breaks or that require extensive repairs. The Water Management Department tracks each repair made to determine which water mains need to be replaced on a priority basis as funding allows. Due to the revenue enhancement created by the implementation of the Reliable Water Supply Program in 2013, there is currently over five times as much funding available for annual water main replacements compared to the average for the years 2011 to 2014. This year's proposed project is the Forest Crest Subdivision in the southwest quadrant of the City. A location map is attached. St. Louis Bridge Road: Since 1980 there have been 79 main breaks in the Forest Crest Subdivision area. Of these, 27 were on St. Louis Bridge Road with 13 in the last 3 years. These mains, laid in the 1960's, do not have an interior cement lining nor exterior protective coating that new ductile iron water mains have. The mains failed due to unusual soil conditions that promoted exterior corrosion causing the pipe to weaken and fail. This year's project replaces the existing 6" main with new 8" ductile iron pipe with a polyethylene exterior envelope to further protect the pipe from corrosive soils. New ductile iron pipe is predicted to have a service life of 50 years with polyethylene envelopes adding another 50 years for a total of 100. File Drive, Alice Lane and Baker Drive: This portion of the project replaces a segment of 6" water main with a new 8" main extending from St. Louis Bridge Road south to Alice Drive and directionally boring a new water main under a small creek on File Drive. Of the 79 main breaks in the subdivision, 19 were on Alice Drive, 13 were on File Drive and 7 on Baker Drive. Alternate Bid No. 1 is to construct a new main along Baker Drive. 1