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� rr <br /> SIERRA <br /> Modesto Dry Ice, located at 260 South Main Street, is approximately 3/4 mile north of the <br /> proposed Chevron site. In 1988 a 2,000-gallon underground fuel tank was removed and <br /> hydrocarbon-bearing soil was discovered approximately 10 feet below grade in the tank <br /> excavation. Hydrocarbon-bearing soil was used to backfill the excavation. A San Joaquin County <br /> Public Health Service's letter to Modesto Dry Ice, dated April 11, 1991, states that a groundwater <br /> investigation must be implemented at the site.4 No further information was available for this site. <br /> According to City of Manteca and San Joaquin County Health Department personnel there <br /> are no polluted wells within one-half mile of the site.'.' <br /> No other potential sources identified in the area reconnaissance were mentioned in the <br /> literature. <br /> 1.3 Topographic and Geologic Setting <br /> The proposed Chevron site is located in San Joaquin County in the town of Manteca. The <br /> topography of the site is relatively flat. The nearest surface water is the San Joaquin River, <br /> located approximately 4.5 miles east of the site. The San Joaquin River flows north and west to <br /> the Suisun Bay. <br /> The site is located in the Great Valley geomorphic province, a nearly flat alluvial plain. <br /> The soil encountered in the boring drilled for this investigation consisted of clean, well <br /> graded and poorly graded sand with lenses of silty sand and sandy silt. This material is mapped <br /> as unconsolidated to semi-consolidated Quaternary alluvium, lake, playa and terrace deposits.' <br /> San Joaquin County Public Health Agency, 1991, Letter from Laurie Cotulla, REHS Program Manager, San <br /> Joaquin County Health Department, to Jack C.Dozier,Inc., Professional Law Corporation, for Claudio Dell'eva, <br /> Modesto Ice owner,April 11, 1991. <br /> 5 Von, Homer, telephone conversation between Homer Von, San Joaquin County Department of Health Services <br /> and Eric Gross, SES Environmental Scientist, August 16, 1991. <br /> 6 Hulsey, 1991, telephone conversation between Joe Hulsey, City of Manteca Engineering Department and Eric <br /> Gross, SES Environmental Scientist, August 16, 1991. <br /> California Division of Mines and Geology, 1977,Geologic Map of California, 1:750,000,Compiled by C.W. <br /> Jennings. <br /> Page 4 <br />