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REFERENCES (cont.) <br /> Hackel, 1966; Summary of Geology of the Great Valley, Geology of Northern California, <br /> California Division of Mines and Geology Bulletin 190, 1966. <br /> USGS (United States Geological Service), 1986; Geology of the Fresh Ground-Water Basin of <br /> the Central Valley, California, with Texture Maps and Sections, U.S. Geological Survey <br /> Professional Paper 1401-C. <br /> FREY Environmental,Inc. 14 Project No. 1095-01 <br />