AgdaPkt 2020-10-12 Joint SA PFA - Laserfiche WebLink

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6.E. - Page 2 of 7 ANALYSIS This Priority -Two project consists of replacing approximately 2,994 linear feet of deteriorated and under - capacity cast iron and asbestos cement water pipelines with more durable and larger eight -inch polyvinyl chloride (PVC) pipes along Southdale Way, Marsh Road, Hoover Street, and Jefferson Avenue. The water service laterals within the project area will also be upgraded to two-inch polyethylene pipes at minimum. Two existing fire hydrants will be replaced while two new fire hydrants will be added to the project area. One blow -off assembly and four combination air release valve assemblies will be installed. The Carson Reservoir is one of the two primary storage tanks for the Main City Zone service area, which includes the Downtown, Seaport and central area residential neighborhoods. This zone accounts for approximately 60 percent of the City's water demand and is served by gravity from the San Francisco Public Utilities Commission (SFPUC) regional system. The Carson Reservoir outlet piping will be reconfigured and a new segment of 184 linear feet of 12" ductile iron pipe will be installed to restore usable storage capacity and to allow complete reservoir drainage for maintenance and cleaning, in addition to improve system seismic reliabilities at the San Francisco Public Utility Commission pipe crossing and increase the reservoir fill and drain range to improve water quality. The project will improve system fire flows and water quality in the project areas. Six bids were postmarked by June 17, 2020 and the bid opening was conducted via Zoom on June 24, 2020: Bidder (lowest to highest) Total Bid Amount (as bid) Mitchell Engineering from Francisco, CA $1,148,917.00 West Valley Construction Company, Inc. from Campbell, CA $1,275,042.00 Westland Contractors, Inc. from Oakland, CA $1,363,102.00 Pacific Underground Construction, Inc. from San Jose, CA $1,453,018.00 Casey Construction, Inc. from Emerald Hills, CA $1,548,853.00 Ghilotti Construction Company, Inc. from Santa Rosa, CA $1,736,404.00 Engineer's Estimate $1,150,000 - $1,250,000 The low bid of $1,148,917.00 submitted by Mitchell Engineering is approximately 8% lower than the upper range of the engineer's estimate of $1,250,000.00 for project construction cost. Based on the bids received, staff believes that the low bid is reasonable, balanced and recommends awarding the contract to Mitchell Engineering. Construction should begin in October 2020 and conclude within 180 calendar days. Staff will notify all residents and businesses who might be affected by the construction. Additionally, the contractor is obligated to notify area residents and businesses two weeks prior to the start of work on each street and/or two days prior to any interruption of water service. Staff will post signs with project information at the construction sites and post construction updates on the City's website. Page 2 of 4 City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcity.org 48