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18 September 1998 <br /> AGE-NC Project No 95-0173 <br /> Page 7 of 8 <br /> E a TPH-g was detected in ground water samples collected from wells MW-1 through MW-4, <br /> MW-6, MW-8, MW-9, MW-11, VW-1, AW-1B and AW-213 at concentrations ranging as <br /> high as 390,000 parts per billion (ppb) <br /> - TPH-d was detected in ground water samples collected from wells MW-1 through MW-4, <br /> MW-9,MW-11, MW-12, VW-1, AW-IB and AW-2B at concentrations ranging as high as <br /> 23,000 ppb <br /> BTEX were detected In ground water samples collected from wells MW-1 through MW-4, <br /> MW-6, MW-8, MW-9, MW-11, VW-1, AW-113 and AW-213 at concentrations ranging as <br /> high as 69,000 ppb(toluene,VW-1) The greatest benzene concentrations were detected from <br /> well VW-1 at a concentration of 35,000 <br /> a Laboratory analysis of ground water samples indicates that the greatest concentrations of <br /> dissolved petroleum hydrocarbons continues to be located near wells VW-1, MW-2,MW-3 <br /> and MW-4 (Figure 7) <br /> a Laboratory analysis reported that none of the fuel oxygenates were detected above laboratory <br /> reporting limits from selected soil or ground water samples <br /> 10 a From December 1996 to July 1998, decreasing concentrations of total petroleum <br /> hydrocarbons have been reported from MW-I (Appendix F) <br /> • From January 1998 to July 1998, increasing total petroleum hydrocarbon concentrations and <br /> decreasing ground water elevations (negative correlation) have been reported from wells <br /> MW-3, MW-4 and VW-1 (Appendix F) <br /> - Laboratory analysis reported the detection of tetrachloroethene (PCE) from wells MW-10 <br /> and MW-11 at concentrations of 20 ppb and 16 ppb, respectively PCE is a chemical <br /> compound commonly utilized within the dry cleaning industry <br /> AGE does not believe that the detection of tetrachloroethene from wells MW-10 and MW-1 I <br /> is related to the current investigation <br /> - Field observations and laboratory analysis of soil samples collected from soil boring B10 <br /> indicated that no petroleum hydrocarbon-impacted soil was present Therefore, based on soil <br /> Mata rennrti-d frnm well AW_? In the nunrlarh)Apnnrt- ll-tnhor eyed AlmyomAor 1 QQ7 (rintari <br /> 18 December 1997), impacted-soil at the site does not appear to extend beyond 85 feet bsg <br /> - Field observations and laboratory data suggest that the impacted ground water beneath the <br /> site appears to have taken an elongated oval shape (Figure 6) <br /> - The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br /> current array of ground water monitoring wells <br /> Advanced GeoEnvironmental,Inc <br />