Seismic Refraction Surveying (Including MASW/S-Wave)

The contract requires the execution of five seismic refraction lines to map subsurface geology and generate detailed seismic velocity profiles, with two of these lines specifically employing MASW or S-wave methods to enhance subsurface characterization. Work must be conducted in off-roadway areas where traditional access is not feasible, necessitating the use of rope access techniques performed by certified climbers to ensure safety and precision in challenging terrain. The project is classified under NAICS code 541370 for geophysical surveying services and is structured as a subcontract under Caltrans District 2 in Redding, California. Although specific location details are not provided, all fieldwork is confined to areas outside roadway boundaries requiring specialized field methodologies and highly trained personnel. The solicitation was posted on June 12, 2026, with no set-aside designation indicated, and all performance activities are expected to meet technical standards for subsurface characterization in support of transportation infrastructure planning.