AgdaPkt 2019-08-26 Joint SA PFA - Laserfiche WebLink

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6.E. - Page 2 of 22 availability of funds. Located in Redwood Shores, Peninsula Water Tank No. 2 is considered to be vulnerable to earthquake damage due to its unique location, size and structural system. Structural and seismic analysis has identified that retrofitting the foundation of Peninsula Tank No. 2 will greatly reduce future earthquake damage to the tank and its inlet and outlet pipes, prevent loss of potable water service to more than 12,000 users, and avoid loss of water for suppression of earthquake -induced fires. The Peninsula Tank No. 2 Seismic Improvement Project is the fifth of a series of recommended seismic retrofit projects in the Water System Master Plan. Staff has acquired a grant funding from the Federal Emergency Management Agency (FEMA) Hazard Mitigation Grant Program for the amount of $718,945.50. The grant will assist the City to complete the above-mentioned essential seismic retrofit work. The federal grant is managed through the California Governor's Office of Emergency Services (Cal OES) with a cost -share requirement of 75% Federal and 25% City. ANALYSIS The Project proposes improvements to the tank foundation by means of driving additional steel piles and load transfer slabs, as well as installation of flexible pipe to tank connections to allow a certain degree of freedom to prevent structural damage to the tank and to inlet-outlet pipes during an earthquake. The main components of the Project include: • Driving 64 battered/angled 12 inch diameter steel piles; • Construction of three concrete pile caps and load transfer (tank to piles) slabs; • Installation of three Flex -Tend (flexible connectors) to connect tank to exterior pipelines; • Remove and Replace a segment of existing tank sub -drain with a flexible pipe; • Disinfection and testing of pipes and fittings; and • Install three Test Piles at 60, 42 and 25.5 feet embedment respectively. The Engineer's Estimate of Probable Cost of this project is approximately $650,000 to $690,000. Staff conducted a non -mandatory pre-bid meeting on June 27, 2019. The bid opening was held on July 2, 2019. The City received four bids as listed below: Bidder (lowest to highest) Total Bid Amount Anderson Pacific Engineering Construction, Inc. From Santa Clara, CA $1,043,700.00 Disney Construction, Inc. From Burlingame, CA $1,283,333.00 Valentine Corporation From San Rafael, CA $1,349,369.00 City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcity.ore 49