I-680 Alameda Creek Bridge Scour Repair Project (EA 04-0P910)

The California Department of Transportation is undertaking the I-680 Alameda Creek Bridge Scour Repair Project to address severe erosion around Piers 7, 8, and 9 caused by altered water flows from adjacent mining operations. The scour hole between Piers 8 and 9 spans approximately 40 feet in width, up to five feet in depth, and 27 feet in length, with unstable silt deposits undermining structural integrity. To stabilize the area, excavation will be conducted and rock slope protection made of shot rock placed along the upstream edges of the piers. Simultaneously, the bridge deck will be rehabilitated through cold planing of 1.5 inches of polymer concrete followed by the application of a 0.75-inch overlay of polyester concrete using slip-form paving machines, with no more than two inches of ground disturbance beneath the existing pavement. Expansion joint seals will be cleaned and replaced, and median barriers on the approach slabs will be removed and reinstalled. All removed asphalt and concrete materials will be transported off-site for disposal at approved facilities. The project requires regulatory compliance under the California Fish and Game Code section 1602, with approval formalized through Lake and Streambed Alteration Agreement EPIMS-ALA-54540-R3 issued by the California Department of Fish and Wildlife. It is also covered by an Incidental Take Permit under the California Endangered Species Act, authorizing limited impact on the California tiger salamander and mandating specific mitigation and monitoring protocols. Environmental compliance is documented through a Mitigated Negative Declaration under CEQA, with all work executed under CDFW oversight. The project site is located at I-680 Bridge #330047 at PM R10.15 in Sunol, Alameda County. While the solicitation number is 2081-2024-072-03 and posted on November 17, 2025, the contract type, pricing details, and FAR clauses are not specified in the documentation. Key contacts include Julian Smith at Caltrans as the lead agency point and Karen Taylor at CDFW as the senior environmental scientist responsible for permitting and compliance. No federal procurement elements such as CLINs, payment terms, evaluation factors, or clause citations are included, reflecting a state-level project executed under environmental and infrastructure regulatory frameworks rather than formal federal acquisition procedures.