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benzene, and TPH-G were not detected at or above the laboratory reported detection limits in the groundwater %ample collected from MW-2 Benzene xylene M TBE, tertiary butanol, and TAME were detected in the groundwater ,ample collected from MW-2 (0 4, 1 5, 550, 72 and 3 6 }ig/l, 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/1) BTEX, MTBE and TPH-G were detected in the groundwater sample collected from MW-4 (1 6 fig/l, 0 4 pg/l, 2 0 kig/I, 22 gg/I, 14 Ag/l, and 0 8 mg/l, respectively) Laboratory analytical results for the September 18, 1997 sampling event are presented below in -I able B 6 TABLE B.6 Groundwater Sample Analytical Results—September 18, 1997 R I I X Gasoline I PFI-G rEPH Additives Oxygenates Kerosene Diesel Motor Oil I OLctlon 0 i 0 3 0 3 0 6 1 0 005 005 005 0 5 I Hnit% µg/1 Ilg/1 t(g11 Ag/1 µg/1 mg/l mg/l tng/l n1g/1 tialnplc. 1 i) MWI-9/18197 NJ) ND NI) NI) ND ND ND ND NI) MW2-9/18197 0 4 ND ND 1 5 550(MTBE) ND ND ND ND 72(tr.rtlary- butanol) i G(I AMf:) MW3-9/18/97 NI) NJ) ND NI) 79(MFlit-) NJ) NI) ND NI) IMW4-9/18/97 16 04 20 22 14 (MI11F) 008 ND ND ND Unit( irn Lr%ionti An,lNil,ll jA.Aj,, p tris per billion(ppb) 111F% bl„nne tUlnette ethyl bcnzcnc and xylene mlR.l, pmts per milbon(ppm) TFP14 totil peaoleiuti hydrocarbons,quantt ied i%4roscric djrs l mid motor oil TPH(r-t0t1l pt.irolcum hydtocarbona quantiftcd as f,asolmc NiTHF methyl tert butyl ether TAME-ternary mnyl methyl ether NO mine dctcctcd at nr above l tboiatorydelecnon tlmllS ' other%nsolint addlnves/ox)f,cnatcs ND On December 31, 1997, Condor personnel were on site to conduct quarterly groundwater monitoring Laboratory analyse% of groundwater tramples 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, D1PE, and LTBE 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 intrinsti, bioremediation parameters was not conducted because additional monitoring, possibly for one year, is Inecessary to evaluate the potential for intrinsic bioremediation at the site Groundwater elevation measurements collected at the site on December 31, 1997, indicated that the average depth to groundwater was approximately 4 feet bgs The average depth to water at the site decreased by