SON-128 Slope Failure Repair DDO (EA 4X040)

Caltrans, District 4 - Bay Area/Oakland, has initiated an emergency slope repair project at 2560 Highway 128 in Sonoma County to address a 30-foot-wide by 12-foot-high failure caused by soil saturation and a suspected drainage issue, likely from a spring or leak on adjacent private property. The repair involves stabilizing the embankment using Class VI, 3/8 ton Rock Slope Protection (RSP) placed via Type A method over RSP fabric, with excavated or imported borrow material used to fill voids. A 50-foot section of the natural drainage ditch, extending 10 feet east and west of the failure zone, will be reestablished to match existing grade and drainage patterns. Traffic control measures are required throughout construction to maintain safety on westbound SR-128. The project has been classified under a CEQA categorical exemption, specifically Class 1(d) for Existing Facilities, and no formal solicitation number or contract value has been assigned as of the posted date of September 5, 2025. The work is considered a maintenance emergency and is being administered under Caltrans internal procedures rather than federal acquisition regulations. The Senior Environmental Scientist, Juliane Smith, serves as the primary contact and lead agency representative for environmental compliance and project oversight. No federal contract clauses, payment details, evaluation factors, or technical specifications beyond Caltrans standard practices are documented in the available materials. The place of performance is the unincorporated area of Sonoma County at post mile 7.63, with no designated contractor yet selected and no formal delivery, invoicing, or acceptance criteria outlined beyond site-based completion.