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07 April 1999 AGE-NC Project No. 98-0481 Page 2 of 3 cubic yards of stockpiled soil. Subsequent to the UST removal, during late 1998 or early I999, earth-moving activities were conducted on the adjacent parcel and the 13 small stockpiles were consolidated into one large stockpile. ddilioonal Stockpile Soil am line On 28 January 1999, AGE collected a total of two discrete soil samples (SP-6 and SP-7) from the existing stockpile at the approximate locations of former stockpile sampling locations of SP4 and SPS. The frequency of sampling, the type of samples (discrete versus composite), and the location of soil sample collection were directed by PHS-EHD oversight personnel at the site. Soil samples were analyzed for BTEX by EPA Method 8020, TPH-d by EPA Method 8015 Modified, TPH-g by EPA Method 8015 Modified, and metals including cadmium, chromium, lead, nickel, and zinc by EPA Method 6010. Soil samples were analyzed by McCampbell Analytical Inc., a State of California Department of Health Services (DHS)-certified analytical laboratory. The laboratory analytical report is attached. Laboratory analytical results for the two soil samples collected from the stockpile are presented in Table 3 (attached). As shown on Table 3, relatively low concentrations of TPH-d were reported for samples SP-6 (3.5 mg/kg) and SP-7 (1.2 mg/kg). There were no reported detections of TPH-g or BTEX for the soil samples. Relatively low concentrations of metals, including chromium, lead, nickel, and zinc, were detected in the soil samples analyzed (Table 3). The reported concentrations of metals were significantly below the U.S. Environmental Protection Agency (USEPA)- recommended Preliminary Remediation Goal (PRG) levels for residential soil (Table 3). There were no reported concentrations of cadmium for the soil samples analyzed. Conclusi ns TPH-d was the only petroleum hydrocarbon compound detected in the two soil samples collected from the soil stockpile in January 1999. The reported concentrations of TPH-d in the soil sample appears to be relatively minor. Concentrations of BTEX and TPH-g compounds appear to have decreased to below detectable levels from the previous sampling conducted in July 1997. This decrease in petroleum hydrocarbon-impacts may be the result of volatilization, aeration, and/or natural attenuation of the petroleum hydrocarbon compounds during the past year and a half, as well as due to the mixing of a relatively small volume of impacted soil (stockpiles SP4 and SP5)with the larger volume of"clean" soil stockpiled at the site. The reported concentrations of metals in the soil Advanced GeoEnvironmental,Inc.