Napa River/Napa Creek Flood Protection Project Geotechnical Explorations - Increment 3

The Napa County Flood Control and Water Conservation District is undertaking geotechnical explorations along the west bank of the Napa River in the City of Napa, California, as a preparatory step for the design of floodwalls under the Napa River/Napa Creek Flood Protection Project, Increment 3. The work, scheduled for implementation between September and November 2025, includes up to 13 soil borings and 9 cone penetration tests (CPTs) spaced 300 to 600 feet apart along the proposed floodwall alignment, focusing on collecting subsurface data such as cone tip resistance, sleeve friction, and pore pressure using split-spoon samplers and CPT equipment. All fieldwork will be conducted temporarily and locally, accessing sites via roadways and vacant lots, with drilling waste transported off-site and all borings and CPTs properly grouted in accordance with Napa County permitting requirements. The project operates under CEQA exemptions Class 4 and Class 6, ensuring only minor, localized land disturbances and no significant environmental impacts, while adhering to state laws on human remains and tribal cultural resources. The contract imposes strict environmental and cultural compliance protocols, including pre-construction biological surveys within 24 hours of mobilization, immediate cessation of work upon discovery of human remains or cultural resources, and mandatory notification of the Napa County Coroner and the Native American Heritage Commission within one hour. A 50-foot buffer must be maintained around any discovered resource, and work may resume only after evaluation by a qualified archaeologist. Operational restrictions limit field activities to 7:00 AM to 6:00 PM, prohibit tree or shrub removal, and require equipment staging only in previously disturbed areas. The district requires coordination with local landowners, the City of Napa, and tribal entities, and allows for repositioning of borings based on site conditions. The point of contact is Richard Thomasser, District Manager, reachable via phone and email. No formal contract terms such as pricing, payment details, contract type, FAR clauses, evaluation factors, or institutional identifiers like UEI or CAGE codes are present, indicating the document functions as a forecasting notice with a focus on environmental and procedural compliance rather than a fully developed procurement instrument.