Special Notice / Hearing: None__
Vote Required: Majority
To: Honorable Board of Supervisors
From: Ann M. Stillman, Director of Public Works
Subject: Increase the Not-to-Exceed Amount for the Higgins Canyon Road Bridge at Mills Creek Embankment and Wingwall Repairs Project in the Half Moon Bay Area [County Project No. RW909, Project File No. E5003]
RECOMMENDATION:
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Adopt a resolution increasing the Director of Public Works' authority to execute change orders to the agreement with Advanced Geotechniques, Inc., for the Higgins Canyon Road Bridge at Mills Creek Embankment and Wingwall Repairs Project in the Half Moon Bay Area, to increase the not-to-exceed of $456,472 by an additional amount of $25,000, to a new not to exceed amount of $481,472.
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BACKGROUND:
On April 19, 2022, this Board adopted Resolution No. 078842, which adopted plans and specifications including conformance with prevailing wage scale requirements and called for sealed bid proposals for the Higgins Canyon Road Bridge at Mills Creek Embankment and Wingwall Repairs Project (Project).
On June 14, 2022, this Board adopted Resolution No. 078956 which authorized an agreement with Advanced Geotechniques, Inc. (AGI), with a not-to-exceed amount of $456,472 for the Project and authorized the Director of Public Works to execute change orders in an amount not to exceed $41,497.
DISCUSSION:
During construction, it was observed that the existing site conditions had deteriorated, changed, or presented unanticipated circumstances since the time of the Project bid. These issues resulted in a lower than anticipated surface elevation at the top of the proposed wall, the existing sacked concrete weir was much larger than originally anticipated, and additional tree work was required to facilitate the construction.
These unexpected changes led to extending the length of the proposed wall, additional concrete removal work associated with the existing sacked concrete weir, and completi...
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