BOARD AGENDA MEMORANDUM
Government Code ? 84308 Applies: Yes ? No ?
(If "YES" Complete Attachment A - Gov. Code ? 84308)
SUBJECT: Title
Receive Report of Bids, Ratify Addenda, Approve the Contingency Fund, and Award the Construction Contract to Granite Rock Company, for the South Babb Flood Mitigation Project, under the Watershed Asset Rehabilitation Program, Project No. 62084001, Contract No. C0716 in the Sum of $1,225,742 (San Jose, District 6).
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RECOMMENDATION: Recommendation
A. Ratify Addendum No. 1 to the Contract Documents for the South Babb Flood Mitigation Project;
B. Award the Construction Contract to Granite Rock Company, located in San Jose, CA, in the sum of $1,225,742; and
C. Approve a contingency sum of 10% in the amount of $122,574 and authorize the Chief Executive Officer or designee to approve individual change orders up to the designated amount.
Body
SUMMARY:
The objective of the South Babb Flood Mitigation Project (Project) is to reduce short-term impacts from flooding to the apartment complex located adjacent to the Project area.
The Project scope includes construction of underground storm water troughs behind the existing floodwall and modifying the floodwalls with openings and flap gates, allowing ponding water to drain back to Lower Silver Creek.
Project Background
South Babb Creek is a tributary to Lower Silver Creek, which is a 43.6 square mile drainage area within the larger Coyote Creek watershed. The entire section of South Babb Creek is located within the City of San Jose and drains into Lower Silver Creek downstream of the Farringdon Drive bridge.
In 2018, Santa Clara Valley Water District (Valley Water) completed civil construction of floodwalls as part of the Lower Silver Creek Project at the confluence with South Babb Creek. Following construction, Valley Water completed a 100-year flood event study that included a hydrologic and hydraulic model of the Lower Silver Creek watershed in support of the Federal Em...
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