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. 3330 Data Drive <br /> p�!Ita Suite 100 <br /> Rancho Cordova,CA 95670 <br /> mental 9161638-2085 <br /> Consultants,Inc. FAX: 9161638-8385 <br /> February 3, 1995 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Soil Management and Sampling Plan <br /> Beacon Station No. 502 <br /> 35 North Cherokee Lane <br /> Lodi, California <br /> Delta Project No. D093-907 <br /> Dear Mr. Earnest: <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized by Ultramar Inc. (Ultramar) to <br /> assist with the management and sampling of soil during the replacement of underground storage tanks <br /> at Beacon Station No. 502, located at 35 North Cherokee Lane, Lodi, San Joaquin County, <br /> California. The purpose of this letter is to provide a plan for the disposal of excavated soil, to notify <br /> San Joaquin County that overexcavation work may take place, and to present a plan for the collection <br /> of soil samples from the excavations and stockpiles. The location of the site is shown in Figure 1 <br /> and a site map is included as Figure 2. <br /> Project Background <br /> The presence of petroleum hydrocarbons in soil beneath the site was detected during lining.of <br /> underground fuel storage tanks in 1987. Since that time, investigative activities at the site have <br /> included the installation of five ground water monitoring wells, measurement of water levels in the <br /> wells to determine ground water flow direction, and sampling of the wells to evaluate ground water <br /> quality. Remedial activities included the installation of a soil vapor extraction system, which was in <br /> operation at the site from 1989 to 1992. <br /> Three soil borings (SB-1, SB-2, and SB-3)were drilled to approximately 50 feet below surface grade <br /> near the underground fuel storage tanks in April 1993. Analytical results indicated that soil samples <br /> collected from soil borings SB-1 and SB-2 did not contain detectable concentrations of petroleum <br /> hydrocarbons. The soil sample collected from soil boring SB-3 at a depth of 15 feet contained total <br /> petroleum hydrocarbons (TPI-1) as gasoline at a concentration of 1,100 milligrams per <br /> kilogram (mg/kg); however, a soil sample collected from the same boring at a depth of 20 feet <br /> contained TPH as gasoline at a concentration of only 3.3 mg/kg, and samples collected at deeper <br /> depths did not contain detectable concentrations of petroleum hydrocarbons. Results of this <br /> investigation-were presented in Delta's Subsurface Investigation Report, dated July 27, 1993 <br /> Providing a Competitive Edge <br />