Wildcat Creek Bridge Geotechnical Site Investigation

The project involves a geotechnical site investigation to support the replacement of the Wildcat Creek Bridge (Br. No. 38-0009) with a single-span structure designed to improve fish passage, with the primary focus on drilling two geotechnical borings—one at each of the proposed east and west abutment locations. These borings will extend to a maximum depth of 100 feet, with the potential for depth adjustments based on encountered subsurface conditions and foundation requirements, and may be relocated by up to 20 feet from original plans due to utilities, traffic, or safety constraints, always prioritizing proximity to existing abutments. All boreholes must be backfilled to the ground surface with neat cement in full compliance with Stanislaus County Environmental Health requirements and California Well Standards Bulletins 74-81 and 74-90. The objective is to collect soil and rock samples for laboratory analysis and to produce a Log of Test Borings, providing data essential for foundation design of the new bridge. Work must adhere to the approved Site Investigation Plan and include seasonal biological surveys between February 1 and September 30 to ensure no disturbance to migratory bird habitats. Environmental compliance is governed by a CEQA Class 6 Categorical Exemption under Public Resources Code 21084 and NEPA’s 23 CFR 771.117(c)(24), with dust control and air pollution standards outlined in Caltrans Standard Specifications Sections 10-5 and 14-9.02. Performance occurs at STA-120-PM 15.04 in Stanislaus County, with acceptance conducted on-site by Caltrans, District 10 - Stockton, which also serves as the overseeing agency. The project is identified by Federal-Aid Project Number 1021000170 and Agency Code 07509eaa, with Laura Cook, Senior Environmental Scientist (Supervisory), listed as the primary point of contact. No formal solicitation number, contract value, pricing structure, or detailed evaluation criteria are provided, and the document is classified as a forecast, indicating a planning or pre-award phase with no binding contract terms established. No formal contract clauses, representations, certifications, or invoicing procedures are specified, and no packaging, marking, or delivery terms apply, as the scope is limited to in-field geotechnical investigation services.