05 - Laserfiche WebLink

BACKGROUND The City has encountered water quality problems at the Foothill Reservoir that have caused the tank to be taken out of service and drained on a regular basis. The current configuration of the tank piping allows layering of the water in the tank, preventing necessary water turn over. In addition, the existing pipe coating system in the tank is failing and corrosion of the pipe contributes to the water quality issues. The project work includes: removing and disposing of 290 linear feet of 14-inch ductile iron pipe; removing and replacing five roof vents and curbs; removing and replacing two ladder safety climb devices; cleaning and coating 600 square feet of existing 16-inch and 20-inch ductile iron pipe and miscellaneous metals and supports; installing 120 linear feet of 16-inch ductile iron pipe, including fittings, concrete and metal supports, and protective coatings. The work will be performed during the winter months when water demand is low based on historical data. DISCUSSION Bids Sealed bids for the water storage tank corrosion repair project were opened on November 14, 2011. A total of four bids were received and reviewed. The bids range between the low base bid amount of $210,670 from, Trinet Construction, Inc., to $457,847 (see attached Bid Summary). The low base bid amount is 1.8% higher than the engineer's estimate of$207,034.50. Staff reviewed the proposal from the apparent low bidder, Trinet Construction Inc., and determined that it was in conformance with the project specifications. Past work performed by Trinet Construction, Inc. was verified to be satisfactory. Staff recommends award of the construction contract to the lowest responsible bidder, Trinet Construction, Inc. of San Francisco, California. Budget Funding for the design and construction of the subject project is included in the City's adopted CIP budget for the Annual Water Replacement project, CIP No. 101028, in the amount of $459,451. An additional amount of $30,215 has recently been added to the available funding for this project from the recently accepted Annual Water Replacement — Longview Drive Pump Station project, CIP No. 091028 ($489,666 total). Project funding and estimated expenditures are presented in Attachment 3 to this report. Staff recommends a 20% construction contingency for this project for necessary related work. The condition of the existing metal under the coated surface cannot be determined until the surfaces have been properly cleaned and surface rust removed. Page 2 of 3