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Advanced <br /> GeoEnvironmental, Inc. <br /> 12 December 1997 <br /> AGE-NC Project No. 97-0312 <br /> Mr. Michael Infurna <br /> SAN JOAQUIN COUNTY PHS-EHD <br /> 304 East Weber Avenue, Third floor <br /> Stockton, California 95202 , <br /> Subject: Soil Stockpile Sampling and Backfilling of Excavation <br /> CHEROKEE TRUCK STOP <br /> 3535 East Cherokee Road, Stockton, California <br /> Dear Mr. Infurna: <br /> In accordance with the request of our client,Mr. Ellis Cecchini of Cecchini, Cecchini and Giovannoni; <br /> Advanced GeoEnvironmental, Inc. (AGE) collected and analyzed samples from stockpiled soil <br /> located at 3535•East Cherokee Road, Stockton, California. The stockpiled soil was generated during <br /> overexcavation procedures performed after the removal of six underground storage tanks (UST) on <br /> 18 September 1997. <br /> Approximately 400 cubic yards of soil are currently stockpiled on the property. On 22 November <br /> 1997, the stockpiled soil was spread to a thickness of approximately three feet. The stockpile was <br /> then divided into sections of approximately 25 cubic yards each. One soil sample was collected from <br /> a depth of approximately 1.5 to 2 feet below the surface-near the center of each section. Each sample <br /> was analyzed for total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d) <br /> and volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes; BTE&X) with <br /> methyl tertiary-butyl ether (MTBE). A total of 16 soil samples were collected and analyzed. The <br /> stockpile location, sample locations and grid areas are illustrated on Figure 1. <br /> TPH-g and TPH-d were detected at concentrations as high as 1,500 parts per million(ppm, reported <br /> as milligrams per kilogram) and 4,100 ppm, respectively. Toluene, ethylbenzene and xylenes were <br /> detected at concentrations up to 0.54 ppm, 2.4 ppm and 44 ppm, respectively.-Benzene and MTBE <br /> were not detected in the samples analyzed. Analytical results are summarized on Table 1. Procedures <br /> and findings will be summarized in a Quarterly Report to be prepared by AGE. <br /> Ground water was recorded at a depth of 55 feet bsg in March 1997, the highest elevation since <br /> monitoring began in 1990-The floor of the UST excavation is at a depth of approximately 15 feet <br /> before the addition of any backfill material, leaving a distance of 40 feet between the bottom of the <br /> 4005 North Wilson Way, Stockton,California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118. <br />