“The USGS requests airborne geophysical data covering areas in the southern San Joaquin Valley, Calif., using magnetic and electromagnetic methods,” USGS officials said in contract documents released Sunday. “An electromagnetic system is required that can image lithologic variations, groundwater salinity variations, and structural controls on groundwater flow within agricultural and suburban areas. These data are intended for rigorous inversion and interpretation of the 3-D hydrogeologic conditions of the subsurface. These data will be used in aquifer and salinity mapping, the design of groundwater monitoring strategies, and the characterization of geologic structures.
“The goal is to provide high quality airborne geophysical data that will be used for quantitative hydrogeologic framework and groundwater salinity studies.”
Companies interested in competing for the contract must contact the USGS by July 16.