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15 January 1997 <br /> AGE-NC Project No 96-0229 <br />' Page 5 of 6 <br />' concentrations up to 7,800 mg/kg (milligrams per kilograms or parts per million ppm), BTEX <br /> constituents were detected in soil samples collected from all probe borings at concentrations ranging <br /> from 0 01 to 530 ppm, and MTBE was detected in soil samples from P-1, P-3, P-4 and P-7 at <br /> concentrations ranging from 0 0052 to 0 012 ppm <br /> Analytical results of soil samples are summarized in Table 2 -Analytical Results of Soil Samples The <br />' laboratory report (Castle Analytical Laboratory Nos 828, 831, 890 and 922) and chain-of-custody <br /> are included in Appendix B Figures 3 and 4 (0 oss Section A - A ' and Ci oss Section B - B', <br /> respectfully) depict the approximate extent of petroleum hydrocarbons beneath the site in cross <br />' sectional view <br />' 44 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> A total of seven grab ground water samples were submitted for laboratory analysis TPH-g was <br />' detected in all ground water samples at concentrations from 1,000 to 210,000 4all (micrograms per <br /> liter or parts per billion ppb), BTE&X and MTBE were detected in ground water samples at <br /> concentrations ranging from 3 7 to 27,000 ppb Total lead was not detected in ground water samples <br /> collected from probe borings P-1 through P-4 <br />' Analytical results of ground water samples are summarized in Table 3 -Analytical Results of Ground <br /> Water Samples The laboratory report (Castle Analytical Laboratory Nos 828, 831, 890 anis 922) <br /> and chains-of-custody are included in Appendix C The approximate lateral extent of dissolved <br />' hydrocarbons in ground water at the site is depicted in Figure 5 -Approximate Ertent of Dissolved <br /> Total Petroleum Hydrocarbons <br />' 5 0 CONCLUSIONS AND RECOMMENDATIONS <br /> S 1 CONCLUSIONS <br /> Based upon data collected from the site between July and October 1996, AGE has the following <br /> conclusions <br />■ <br /> • Laboratory and field data suggests that hydrocarbon-impacted soil at the site is greatest near <br /> the dispenser area (P-2 and P-3) at depths between 15 and 40 feet bsg <br /> • It appears that a laterally extensive smear zone is present at the site, accounting for <br /> hydrocarbon-impacted soil encountered at depths between 25 and 40 feet bsg near the UST <br /> area (P-1 and P-4), Pacific Avenue (P-6 and P-8) and Bianchi Road (P-5) <br />' • The greatest concentrations of dissolved petroleum hydrocarbons are located near the <br />■ <br />