BAI worked with OPAC Engineers and the County of Sonoma, Department of Transportation to investigate the foundation conditions for a replacement bridge over the South Fork of the Gualala River in the steep coastal ranges of Sonoma County.  BAI overcame site access challenges to drill deep test borings at each abutment and one boring in the river channel (see drill rig in photograph).  We also investigated the existing cut slope conditions on the west side of the bridge to give recommendations for cutting further into the slope, thereby increasing bridge approach visibility and safety. BAI deftly navigated regulations regarding drilling within the river channel at the appropriate times so as to protect the resources from disturbance during the investigation.