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0 <br /> ' TABLE B.6 <br /> Groundwater Sample Analytical Results <br /> B T E X Gasoline TPH-G TEPH <br /> Additives <br /> Oxygenates <br /> Kerosene Diesel Motor Oil <br /> Detection 0.3 0.3 0.3 0.6 1.0 0.05 0.05 0.05 0.5 <br /> ' Limits: µg/1 pg/l pg/l pg/I pg/I mg/I mg/l mg/I mg/l <br /> Sample I.D. <br /> MWI-9/18/97 ND ND ND ND ND ND ND ND ND <br /> MW2-9/18/97 0.4 ND ND 1.5 550(MTBE) ND ND ND ND <br /> ' 72(tertiary- <br /> butanol) <br /> 3.6(TAME) <br /> ' MW3-9/18/97 ND NO ND ND 7.9(MTBE) ND ND ND ND <br /> MW4-9/18/97 1.6 0.4 2.0 22 14(MTBE) 0.08 ND ND ND <br /> Unit Conversions: Analytical <br /> ' pglkg:parts per billion(ppb) BTEX=benzene,toluene,ethyl benzene,and xylene. <br /> mg/kg:parts per million(ppm) TEPH=total petroleum hydrocarbons,quantified as kerosene,diesel,and motor oil. <br /> TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> MTBE=methyl tert butyl ether <br /> TAME=tertiary amyl methyl ether <br /> ND=none detected at or above laboratory detection limits. <br /> .=other gasoline additives/oxygenates ND. <br /> ' On December 31, 1997, Condor personnel were on site to conduct quarterly groundwater monitoring. <br /> Laboratory analyses of groundwater samples indicated that BTEX, TPH-G, and the selected gasoline <br /> oxygenates/additives were not detected at or above the laboratory reported detection limits in the sample <br /> ' collected from MW-1. Ethanol, DIPE, and ETBE were not detected at or above the laboratory reported <br /> detection limits in any of the groundwater samples. BTEX, TPH-G, and tertiary butanol were not <br /> detected at or above the laboratory reported detection limits in the sample collected from MW-3. MTBE <br /> ' and TAME were detected in the sample collected from MW-3. Low concentrations of BTEX <br /> constituents and TPH-G were detected in the samples collected from MW-2 and MW-4. MTBE was <br /> detected in MW-4. MTBE, tertiary butanol, and TAME were detected in MW-2. No floating product, <br /> sheen, or petroleum hydrocarbon odor was noted in the monitor wells. Full evaluation of intrinsic <br /> bioremediation parameters was not conducted because additional monitoring, possibly for one year, is <br /> necessary to evaluate the potential for intrinsic bioremediation at the site. <br /> ' Groundwater elevation measurements collected at the site on December 31, 1997, indicated that the <br /> average depth to groundwater was approximately 4 feet bgs. The average depth to water at the site <br /> ' decreased by approximately 2 feet between September 18, 1997 and December 31, 1997. Groundwater <br /> elevation contours estimated using the depth-to-water measurements collected on December 31, 1997, <br /> indicated that groundwater flow at the site is generally consistent with the estimated flow on September <br /> ' 18, 1997. On March 27, 1998, Condor personnel were on site to measure water levels and collect <br /> groundwater samples from the site monitor wells. Laboratory analyses of groundwater samples collected <br /> from the site monitor wells indicated that BTEX, TPH-G and the selected gasoline oxygenates/additives <br /> ' were not detected at or above the laboratory reported detection limits in the sample collected from MW-1 <br /> or the rinsate sample (1432-MW5-3/27/98). Ethanol, tertiary-butanol, DIPE, ETBE, and TAME were <br /> not detected at or above the laboratory reported detection limits in any of the groundwater samples. <br /> Detection limits for the analysis of the samples collected from MW-2 and MW-3 were raised, however, <br /> ' B-5 <br />