Title
Recommendation to Authorize the City Manager to Execute an Agreement with NBC Construction and Engineering, Inc. for the Harbor Bay Isle Lagoon Improvement Project, No. P.W. 07-21-28, in a Total Amount Not to Exceed $344,683. (Public Works 31041520)
Body
To: Honorable Mayor and Members of the City Council
EXECUTIVE SUMMARY
The City of Alameda (City) issued plans and specifications for the Harbor Bay Isle (HBI) lagoon improvement project on September 9, 2021. The project restores automation in gate levelling to move water through the northerly lagoon system coincident with the tide. Staff requests that the City Council award the contract to NBC Construction and Engineering, Inc. (NBC), the lowest responsive bidder, in an amount not to exceed $344,683.
BACKGROUND
The HBI lagoon system, located on the Bay Farm Island peninsula, was constructed in the 1970s. It forms a major component of the HBI community providing open space, aesthetic and recreational enjoyment for residents. The lagoon system also accepts stormwater drainage from the adjacent developed areas. Lagoon 1 extends from the San Francisco Bay at the west end to the San Leandro Channel at the north end, creating a narrow river-like waterway nearly two miles long. The basic operation of Lagoon 1 is dependent on the normal San Francisco Bay tidal action which, through gate control systems located at each end of the lagoon, provide a degree of water movement from west to north while maintaining a desired water level in ]the lagoon.
Water circulation through the lagoon is critical for water quality. Constant circulation and exchange with waters of the San Francisco Bay, periodic and spot treatments with algaecides and the control of stormwater run-off contamination are all required to maintain the overall ambience of the lagoon. Original design and construction of the gate control systems at each end of the lagoon had automatic sensing of Bay and lagoon water levels, which, controlled t...
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