BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Report of Bids Received and Award of Construction Contract to Dixon Marine Services Inc. - for Construction of the Palo Alto Flood Basin Tide Gate Structure Improvements Project, Project No. 10394001, Contract No. C0630 (Palo Alto) (District 7). (Continued from 07/25/2017)
End
RECOMMENDATION:
Recommendation
A. Ratify Addenda No. 1 through No. 3 to the Contract Documents for the Palo Alto Flood Basin Tide Gate Structure Improvements Project, Project;
B. Waive minor irregularities in Dixon Marine Services Inc. bid;
C. Award the Construction Contract to Dixon Marine Services Inc. in the sum of $579,081.07; and
D. Approve a contingency sum of $60,000 and authorize the Interim Chief Executive Officer or designee to approve individual change orders up to the designated amount.
Body
SUMMARY:
The Palo Alto Flood Basin (PAFB) Tide Gate Structure Improvements Project was initiated following emergency repair work on the Palo Alto tide gates which was completed in September 2012. The repair work addressed water flow occurring beneath the tide gate structure. The temporary repair arrested significant under flow; however, additional and permanent improvements are required to avoid future fluvial flooding in the lower reaches of Matadero, Adobe, and Barron creeks and impacts to wildlife and aquatic habitats in the flood basin.
The PAFB Tide Gate Structure was built in 1956. The purpose of the structure is to control the downstream water surface elevation for Matadero Creek, Adobe Creek, and Barron Creek, which all drain to the PAFB. The PAFB controls the downstream boundary condition (starting water surface elevation) for these creeks by keeping the high tide out and allowing the Basin to empty out during the twice daily low tides. Of the current 16 tide gates, 15 are operated by the District and one is operated by the City of Palo Alto. The latter is operated to allow some tidal inflow to the Basin, subject to an elevat...
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