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REFERENCES <br /> Alton Geoscience, 1991-1992, Various reports and miscellaneous correspondence, Pleasanton, <br /> California. <br /> Freeze, R. A., and J. A. Cherry. 1979. Groundwater, Prentice-Hall, New Jersey. <br /> United States Geological Survey, Tracy and Union Island Quadrangles, 7.5 Minute Series, <br /> USGS, Denver, Colorado, 1954, 1978, 1981. <br /> United States Geological Survey. Professional Paper 1401-C, 1986. <br />