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sample, tollc,cted from MW-2 Benzene xylene MTBE, tertiary butanol, and I AME were detected in the groundwater sample collCcled tram MW-2 (0'4 1 5 550 72 and 3 6 gg/l respectively) BTEX and TPH-(j 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 gg/1) B IEX, MTBE and TPH-G were detected in the groundwater sample c.o€lected from MW-4 (1 6 ggd, 0 4 ggd, 2 0 gg/I 22 gg/l, 14 gg/I, and 0 8 mg/l respectively) I aboratory analytical results for the September 18, 1997 sampling event are presented below ' In Tabic g 6 ITABLE B.6 (.roundwater Sample Analytical Results September 18, 1997 B T E X Gasoline i PH-G TEPH Additives E Oxygenates Kerosene Diesel Motor Oil DeteLtion 0 3 03 0 3 06 1 0 005 005 005 05 Limits µg/l µgrl µg/1 µg/1 µg/l mg/I mg/l mg/l mgll sample I D MW1-9/18197 'SID ND ND ND ND ND N1) ND \IW2-9/[8897 {f I 11) NI) 1 5 550(M Fill ) V1) NI) ND ND 72(Lrtiary � . htltanol- — -- - — 3 (3(1 � ) k MWI-9/18/97 NI) till ND NI) 79(MFBF) ISD N1) ND N1) MW4-9118197 rl6 01 20 22 14(MTBF) 008 ND ND ND [ nit(onwistons Anal cal tusk[; parts per htlltem(ppb) BTEX-bLnTene toluene ethyl benzene Ltd xylent ml,/k), parts pct indhon{ppm) TF PH total petroleum hydrocarbons quanm&ed as keruscne. diesel and motor oil I Ptd G total petroleum hydrocarbons quantified as gasoline. MTBF methyl tort butyl ethct TAMF ternaryamyl methyl ether ND-none detected at or above laboratory detccuon limits other basohne addtnves/axy&mates N U On December 31, 1997 Condor personnel were on site to conduct quarterly groundwater monitoring Laboratory analyses of groundwater samples indicated that BThX, 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 F'TBE 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 TAMP, were detected in the sample collected from MW-3 Low concentrations of BTEX constituents and TPII-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