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April 7, 19-9-22 A WVASP#A <br />-. ARCO Service Station No 760, Lodi, California <br /> 1' <br /> Laboratory Results <br /> 1� Residual hydrocarbons were present in the soil samples collected from under the former <br /> tanks and sidewalls of the former tank cavity (Table 5) Analytical results indicated total <br /> lead and EDB were not detected Native soil sampled under the former tank at 13 feet <br /> below grade contained concentrations of TPHg ranging from 9 5 to 250 ppm and BTEX <br />! concentrations ranging from 0 19 to 18 ppm Soil samples from the sidewall contained <br /> TPHg concentrations from 0 52 to 9 1 ppm and BTEX concentrations below 1 0 ppm <br /> Results of analyses of soil samples collected in the new tank cavity indicated TPHg was <br /> r <br /> detected only in sample S-12-T6N, collected from the north sidewall, at a concentration of <br /> 1 4 ppm (Table 6) Ethylbenzene was not detected in the six soil samples collected from the <br /> • new tank cavity; benzene, toluene, and total xylene isomers were detected at concentrations <br /> at or below 0 025 ppm <br /> Residual hydrocarbons were not detected in the soil sample collected from under former <br /> r tank T8 (Table 7) Concentrations of total chromium, nickel, lead, and zinc were below the <br /> Total Threshold Limit Concentration (TTLC) outlined in Title 22, California Code of <br /> Regulations, Section 66699, total cadmium and chromium VI were not detected Results <br /> of analyses of the liquid in tank T8 (labeled W-6-T8) indicated 170 ppm TPHg, 1,900 ppm <br />! total petroleum hydrocarbons as diesel (TPHd), and BTEX concentrations of 7 5, 8 8, 1 2, <br /> and 12 ppm, respectively, TOG was not detected <br />! Concentrations of TPHg at 2,200 and 5,700 ppm were detected in soil samples S-3-PL1 and <br /> S-3-PL3, respectiv6ly, collected under the former product lines (Table 8) Concentrations <br /> of BTEX compounds ranged from 0 85 to 410 ppm EDB was not detected in these soil <br /> samples, however, the detection limits were 20 ppm According to Enseco laboratory <br /> 1 . <br /> 38048-5 11 <br /> i <br />