TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Graham Wadsworth, P.E., Engineering Supervisor
SUBJECT: Award a Construction Contract for the Dry Creek Road Bridge over Dry Creek Replacement Project, RDS 15-22
RECOMMENDATION
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Reject the low bid from Steelhead Constructors Assoc. Joint Venture as non-responsive, award a construction contract to Gordon N. Ball for their low bid of $6,331,821 for the replacement of the Dry Creek Road Bridge over Dry Creek; approve and authorize Amendment 1 to Agreement No. 250223B with Bureau Veritas for a contract maximum of $162,751 for construction management services; and approve a Budget Amendment for the construction and construction management services. (Fiscal Impact: $9,056,050 Expense; Capital Improvement Fund; Not Budgeted; Discretionary)
[4/5 vote required]
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BACKGROUND
The Dry Creek Road Bridge over Dry Creek (0.8 miles west of Mt. Veeder Rd.) is over 100 years old. Caltrans identified the bridge as structurally deficient, functionally obsolete, and unstable due to scour under the north abutment. The substructure of the existing bridge has cracking and weathering of the mortar in the joints of the stone masonry abutments. The top section of the retaining wall near the north abutment has broken away and is leaning outward horizontally. The width is only 18 feet between the barriers, which does not meet the American Association of State Highway and Transportation Officials (AASHTO) standard of 11-foot minimum lanes. AASHTO is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design.
The proposed bridge structure would consist of an approximately 80-foot-long by 32-foot-wide single- span concrete slab bridge that would be constructed on pre-cast and pre-stressed concrete girders. The project also includes 900 feet of new roadway to remove two curves in Dry Creek Road. County staff anticipates that the contractor w...
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