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March 26, 1998 ✓ �..i Page 2 impacted groundwater was removed from the new UST pit and transported to a permitted facility for treatment. Groundwater was removed to accommodate installation of the new USTs. EXCAVATION AND REMOVAL ACTIVITIES The USTs, associated product lines, and product dispensers were removed on November 10, 1997 by Gettler-Ryan, Inc. Excavation,removal, and sampling activities were observed and approved by Mr. Mike Infurna and Mr. Robert McClellon of the San Joaquin County Public Health Services Department, Mr. Frank H. Pinnell of Five-Star Enterprises, and Mr. James.Monty of the Manteca-Lathrop Fire District. Facilities removed included two 10,000-gallon and one 4,000-gallon double-walled gasoline tanks, associated fiberglass product lines, and product dispensers. The tanks appeared to be in good condition, with no apparent holes or cracks noted during removal. Approximately 1,241 tons of hydrocarbon-impacted soil were removed from the site and transported by Manley and Sons Trucking, Inc. to Forward Landfill in Stockton, California. UST COMPLEX SAMPLING Six soil samples were collected on November 10, 1997 from the UST excavations at depths of 13 and 14 feet bgs. Analytical soil results indicated maximum concentrations of TPH-g, benzene, and MtBE in the area of sample T-3-E at 5,800 parts per million(ppm), 3.6 ppm, and3.6 ppm, respectively. Concentrations of TPH-g ranging from 130 to 1,800 ppm were detected in the remaining samples. Benzene was only detected in one other sample, T-1-S, at 0.52 ppm. MtBE was also only detected in one other sample, 0.19 ppm in T-2-N. With the exception of the MtBE concentrations summarized above, no other oxygenates were detected by EPA Method 8260 in any of the samples. In addition, no lead was detected in any of the collected samples. UST soil analytical data is presented in Table 1 and sample locations are shown on Figure 2. Three composite samples (SP-1, SP-2, and SP-3) were collected from the stockpiled soil. Four sleeves were collected and composited into one sample for analysis. TPH-g was reported in all three samples at concentrations ranging from l 1 to 180 ppm. Ethylbenzene and total xylenes were reported in SP-I at concentrations of 0.18 and 9.3 ppm, respectively. Stockpiled soil analytical data is presented in Table 2. Four well boxes were installed on site by Gettler-Ryan in preparation for future well installation. SUMMARY OF FINDINGS • Six soil samples collected beneath the old UST complex contained concentrations of TPH-g ranging from 130 to 5,800 ppm. Benzene was not detected in four of the six samples. Benzene was detected in T-I-S and T-3-E at concentrations of 0.52 and 3.6 91 1-t10>-I A/TKPULRPT-DOC