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Department of Transportation recommending the Board approve and authorize the Chair to sign the Fifth Amendment to Agreement for Services 467-S1411 with Quincy Engineering, Incorporated, to provide continued assistance with design support services during the construction of the Mosquito Road Bridge at South Fork American River Project, Capital Improvement Program project number 77126 / 36105028, with the following:
1) Amend the scope of work to include design support services during the construction of the Mosquito Bridge;
2) Extend the performance period to December 31, 2025;
3) Increase the not-to-exceed amount to $6,950,886.23; and
4) Update the fee schedule.
FUNDING: Highway Bridge Program Funds (99.9%) and Sacramento Municipal Utility District Funds (0.1%). (Federal and Local Funds)
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DISCUSSION / BACKGROUND
The Mosquito Road Bridge crosses the South Fork of the American River approximately 5.9 miles north of U.S. Highway 50 in Placerville, just south of the community of Swansboro. It is a 9-foot wide, one-lane limited capacity timber suspension bridge with a 140-foot-long span over the South Fork of the American River. The existing bridge was built in 1939 and is 74 years old. The bridge is crossed daily by approximately 1,300 vehicles (in both directions). Emergency vehicles are restricted from using the bridge due to the narrow width, combined with multiple hairpin curves and steep grades along the bridge approaches on both sides, resulting in delayed emergency response time.
A Request for Proposals process was completed in 2013, from which Quincy Engineering, Incorporated (Quincy) was selected from the list of qualified companies as the best firm to complete a Replacement Study, the Project Approval, Environmental Document, and Final Design for the Mosquito Road Bridge at South Fork American River Project (Project). The Board approved the Agreement for Services (Agreement) on July 29, 2014 (Item 10, Legistar 13-0549). The Agreement exp...
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