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Commission approves $19,198 change order to lower Sterling Lincoln Ave pond weir by 4 inches
Summary
The commission approved Change Order No. 5 for Sterling Lincoln Avenue (job 20190046) after staff said an emergency overflow weir was installed 4 inches too high in 2019; Niblock provided a $19,198 quote to remove/restore riprap and landscaping to protect parking-lot and roadway elevations.
Engineering staff presented Change Order No. 5 for the Sterling Lincoln Avenue reconstruction and drainage improvements (job 20190046). Staff said due diligence on the La Casa development revealed the retention-pond emergency overflow weir sits approximately 4 inches higher than intended, which reduces the pond’s emergency freeboard and could allow standing water on Lincoln Avenue during a 100-year event. Staff recommended lowering the weir by 4 inches to restore design elevations and protect the adjacent parking lot and low rim elevations on Lincoln Avenue.
Speaker 4 described the scope and costs: removing and replacing riprap and restoring landscape would be the majority of the expense; Niblock (contractor) quoted $19,198. Staff stated that the structure appears to have been installed incorrectly in 2019 and that earlier projects lacked a formal weir-check process. Commissioners asked who installed the weir and whether liability exists; staff said the installation likely predates current internal check procedures.
A motion to approve Change Order No. 5 was moved, seconded and approved. The transcript records the vote as 'that has passed 4 to 0.'
Next steps: staff will execute the change order with the contractor and schedule restoration work, and will continue to check weir heights on future projects to avoid recurrence.
