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Geophysical field studies are described which were made to ascertain the depth of weathered overburden mantle rock at the proposed site of a dam, on the American River in California. The applications of the electrical resistivity, the seismic refraction, and the magnetic methods in attacking this problem are discussed. The interpretation procedures employed are explained. Examples of results are presented which show that the geophysical and core drill determination of the depth to sound rock agreed within less than 4 ft. It is brought out that geophysics is a useful exploration tool at sites where the amount of rock that would have to be stripped is a factor.
Geophysicist, U. S. Bureau of Reclamation, Deniver, Colo.