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sample collected from MW-2 Benzene, xylene, MTBE, tertiary butanol, and TAME were detected in the groundwater sample collected from MW-2 (0 4, 1 5, 550, 72 and 3 6 µg/1, respectively) BTEX and ^I PH-G were not detected at or above the laboratory reported detection limit in the groundwater sample collected from MW-3 MTBE was detected in the groundwater sample collected from MW3 (7 9 µg/l) BTEX, MTBE and TPH-G were detected in the groundwater sample collected from MW-4 (1 6 µg11, 0 4 µg11, 2 0 µg/l, 22 gg/l, 14 µg/1, and 0 8 mg/l, respectively) Laboratory analytical results for the September 18, 1997 sampling event are presented below In Table B 6 ' TABLE B.6 Groundwater Sample Analytical Results —September 18, 1997 ' B T E; X Gasoline I PH-G TEPH Additives Oxygenates ' Kerosene Diesel Motor Oil Dttf-ctlon 03 03 03 06 10 005 005 005 05 I tmlts µg/1 µg/l n/l µg11 µg14 Mg/1 mg/I mg/I mg/1 ' Sample 1 I) 7MW4-9/18/97 ND ND ND ND ND ND ND ND ND 04 ND ND 1 5 550(MTBE) ND ND ND ND 72(tertlary- butanol) 36(1AME) * ND IN 1) ND ND 7 9(MTBr) ND ND ND ND 1 l 6 04 20 22 14(MI B£) 008 ND ND ND Unit Conversions Anal cal µ&/kg parts per billion(ppb) BTEX=bermene toluene ethyl benzene and xylene mp'kg pins per million(ppm) TEPH total petroleum hydrocarbons quantified as kerosene diesel and motor oil TPH G total petroleum hydrocarbons gasnti8ed as gasoline MTBE methyi tut bury]ether TAME-tertiary amyl methyl cthu ND=none detected at or above laboratory ddtcchon limits . other t,asolnre additivcs/oxY6cna9es ND ' On December 31, 1997, Condor personnel were on site to conduct quarterly groundwater monitoring Laboratory analyses of groundwater samples indicated that BTEX, TPH-G, and the selected gasoline oxygenates/additives ' were not detected at or above the laboratory reported detection limits in the sample collected from MW-1 Ethanol, DIPS, and ETBE were not detected at or above the laboratory reported detection limits in any of the groundwater samples BTEX, TPH-G, and tertiary butanol were not detected at or above the laboratory reported detection limits in the sample collected from MW-3 MTBE and TAME were detected in the sample collected ' from MW-3 Low concentrations of BTEX constituents and TPH-G were detected in the samples collected from MW-2 and MW-4 MTBE was detected in MW-4 MTBE,tertiary butanol, and TAME were detected in MW-2 No floating product, sheen, or petroleum hydrocarbon odor was noted in the monitor wells Full evaluation of ' intrinsic bioremediation parameters was not conducted because additional monitoring was necessary to evaluate the potential for intrinsic bioremediation at the site Groundwater elevation measurements collected at the site monitor wells on December 31, 1997, indicated that the average depth from the ground surface to groundwater was approximately 4 feet The average depth to water at the site decreased by approximately 2 feet between September 18, 1997 and December 31, 1997 Groundwater