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7.0 REFERENCES <br /> Anon Geoscience, 1991-1992, Various reports and miscellaneous correspondence, Pleasanton, <br /> California. <br /> Alton Geoscience, 1993, Human Health Risk Assessment For Petroleum Hydrocarbons In Soil <br /> and Ground Water, Former Mobil Oil Bulk Plant 04-343, 500 East Grantline Road, Tracy, <br /> California, June 29, 1993. <br /> United States Geological Survey, Tracy and Union Island Quadrangles, 7.5 Minute Series, <br /> USGS, Denver, Colorado, 1954, 1978, 1981. <br /> i <br /> 6 <br />