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14 August 2000 <br /> AGE-NC Project No 95-0128 <br /> Page 8of10 <br />' TPH-g was detected in the ground water sample collected from well MW-12A at a <br /> concentration of 80 ,ug/l TPH-d was detected in the water sample collected from well <br /> MW i 2B at a concentration of 61 µg11 <br />' 0 BTEX compounds were not detected above laboratory reporting limits in any of the ground <br /> water samples collected during the 20 June 2000 monitoring event <br /> I0 MTBE was detected in all ground water samples collected, with the exception of well <br /> MW-10 Detected concentrations of MTBE ranged from 42 µg11 (MW-9) to 1,700 µg/1 <br /> (MW-12A) <br />' 0 No other fuel oxygenated compounds were detected above laboratory reporting limits in the <br /> ground water samples collected from during the 20 June 2000 momtonng event <br /> r <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> I A summaryof findings for the 26 April 2000, 07 to 09 June 2000 and 20 June 2000 events indicated <br /> g <br /> lie the following points <br /> • TPH-g, TPH-d, and BTEX compounds were not detected above laboratory reporting limits <br /> In any of the soil samples collected from pilot bonngs for MW8 through MW 12 <br /> I <br /> • MTBE was detected in the soil samples collected from bonngs MWS, MW9, MW11, and <br /> MW 12 at concentrations ranging from 7 3 µg/kg(MW9-40)to 390µg/kg(MW 12-40), these <br /> Iconcentrations may be more reflective of impacted ground water in the pore spaces of the soil <br /> than of adsorbed MTBE <br /> • Monitoring wells MW-2, MW-4, MW-5, MW-6, MW-12A, and vapor extraction wells <br /> VW-1 have been impacted by detectable concentrations of various BTEX compounds and <br /> petroleum hydrocarbons <br /> IThe five momtonng wells with deeper-screened intervals yielded samples with very low or <br /> non-detectable concentrations of petroleum hydrocarbons The deeper-screened monitoring <br /> wells do yield samples with low concentrations of MTBE A few previous samples from <br /> a_ 11 .f11 T 11 ,] A R11 T "1 1_.-._ 1,., 1_ a,� i,_ I_ a...4 C TTI A <br /> 111L)I11UJl Mg' WCIlb 1V1 VV-G d11U LVl VV-J 11dVC d1hU LAeCl1 1111Pd.GLGU Uy lUW l.Vi1LGl'llldLlolls UL 1 Bik <br /> The data suggests that vertically downward migration of petroleum hydrocarbons is minor <br /> to insignificant, and also indicates that deeper hydrocarbon-impacted soil horizons are not <br /> significantly impacting the ground water with petroleum hydrocarbons This also suggests <br /> that the more significantly petroleum hydrocarbon-impacted ground eater occurs in the <br /> Iupper twenty feet of the ground water column <br /> • The oxygenating fuel additive MTBE was detected In all of the ground water samples <br /> Icollected, with the exception of samples from wells MW-1 and MW-10 The concentrations <br /> Advanced GeoEnvironmental Inc <br />