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County approves $3.05 million amendment for Foresthill Bridge weld testing and repairs
Summary
Public Works reported that ultrasonic testing of welds on the Foresthill Bridge found a higher-than-expected number of weld indications; the board approved a $3,054,394 amendment to the Atlas Technical Consultants agreement to complete testing, drilling and incidental repairs.
Placer County public-works staff told the Board of Supervisors on Tuesday that ultrasonic testing of welds on the Foresthill Bridge (the county-owned high steel structure on Foresthill Road) has identified more repair work than originally estimated, and the board approved an amendment to the professional-services agreement with Atlas Technical Consultants to finish testing and perform incidental weld drill-outs and repairs.
Matt Randall and public-works staff outlined the work scope: establish temporary access beneath and inside bridge boxes, remove paint at welds, perform ultrasonic inspections, drill stop-holes at rejected indications and restore protective painting. The county reported testing is about 75% complete; roughly 37% of inspected welds showed some indication and about 14% met the threshold for a “rejectable” indication that requires drill-and-repair measures.
Public-works staff said federal Highway Bridge Program funds will cover about 80% of the work and the county’s Road Maintenance and Rehabilitation Act (RMA) funds will cover the balance. The board adopted the resolution authorizing Amendment No. 1 to the Atlas agreement, increasing the agreement by $3,054,394 for a total not-to-exceed of $8,465,381, and authorized staff to execute amendments up to $846,538 consistent with county procurement rules.
Staff emphasized the work is preventive maintenance intended to arrest small weld defects before they would grow under load cycles, and to keep the bridge open and safe for traffic. The bridge inspection and repair program is coordinated with Caltrans and the Federal Highway Administration, staff said.
