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Y:. i; 4 � _ 27 September 1999 AGE-NC Project No. 97-0327 Page 6 of 9 Faint petroleum hydrocarbon odor was noted in a grab ground water sample collected from probing P-8. 4.3 ANALYTICAL RESULTS OF SOIL SAMPLES A total of thirteen soil samples were submitted to DHS-certified laboratories (Castle Analytical Laboratory and McCampbell Analytical Inc.) for analysis as noted above. TPH-g was detected in the 40-foot soil sample collected from boring P-8 at a concentration of 340 mg/kg. TPH-d was detected in the 40-foot soil sample collected from P-8 at a concentration of 37 mg/kg; the laboratory reported that unmodified or weakly modified diesel is significant. BTEX compounds were detected in the 40-foot soil samples collected from the P-6 and P-8 at concentrations ranging as high as 20 mg/kg;MTBE was detected in the 40-foot soil sample collected from P-8 at a concentration of 0.019 mg/kg. No other fuel oxygenated compounds were detected during the laboratory analysis of selected soil samples. Analytical results of soil samples are summarized in Table 2. The laboratory report(Castle Analytical Laboratory Reference No. 2331 and McCambell Analytical Inc. Lab I.D. 14311 through 14323) and chain-of-custody are included in Appendix B. The estimated extent of petroleum hydrocarbon-impacted soil is depicted in cross sectional view A -A ' in Figure 4. 4.4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES Grab ground water samples were collected from boring P-8 and submitted to DHS-certified laboratories for analysis as noted above. TPH-g and TPH-d were detected in the ground water sample at a concentration of 1,900 micrograms per liter (µg/l); however, the laboratory reported that the diesel chromatogram for the sample did not have typical diesel characteristics. BTEX compounds were detected in the ground water sample at concentrations ranging as high as 310 µg/l; dissolved benzene was detected at a concentration of 230 ,ug/l. Dissolved MTBE was detected at a concentration of 51 yg/l utilizing EPA Method 8020 and confirmed at a concentration - of 52 ug/l,utilizing-EPA Method 8260: No other fuel oxygenated compounds were detected during the laboratory analysis of the ground water sample. Analytical results of ground water samples are summarized in Table 3. The laboratory . report(Castle Analytical Laboratory Reference No. 2331 and McCampbell Analytical Inc. Lab ID I143 24) and chain-of-custody,are included in Appendix B. Arh-anced GeoEnvironmenlal,Inc.