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' 22 March 1999 <br /> • AGE-NC Protect No 95-0143 <br /> Page 4 of 5 <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> • Ground water elevation decreased an average of 1 1 feet between August 1998 and February <br /> 1999. The inferred ground water flow direction remains towards the north to northeast at the <br /> site <br /> • Petroleum hydrocarbons were not detected in wells MW-10, MW-14, MW-15, MW-16 and <br /> MW-17 during the November 1998 sampling event BTEX compounds were detected in <br /> ground water samples collected from MW-10, MW-14, MW-15 and MW-17 during the <br /> February 1999 monitoring event at concentrations slightly above the laboratory reporting <br />' limits These wells appear to define the lateral extent of impacted ground water toward the <br /> south, east and north <br /> 1,2-DCA as detected in the sample collected from MW-14 durin .t�he'No-r ber 1998 <br />' mo g event, but was not an analyte for the February 1999 same DIPS w detected <br /> in MW-14 during both the November 1998 and February 1999 sampling events Being the <br /> 10 <br /> only well to yield samples containing this analyte, it is possible that an off-site source is <br /> impacting the ground water in the area of MW-14 <br /> • Free product has not been encountered at the site since May 1996 However, ground water <br /> has remained above the screened interval in MW-3,which could prevent the detection of free <br /> product, if present Concentrations of detected hydrocarbons in MW-3 are Indicative of free <br /> Iproduct <br /> • Monitoring wells MW-3 and MW-9 are the most intensely impacted wells despite also <br /> having the thickest saturated zone, nearly nine feet, above the well screens <br /> • Petroleum hydrocarbon concentrations have remained generally stable at the site In general, <br /> hydrocarbon concentrations have followed a fluctuating,poorly defined trend since quarterly <br /> monitoring began <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during the November 1998, February 1999 and previous sampling events, <br /> AGE recommends <br /> • Installation of the approved remediation system Installation is scheduled to be initiated on <br /> 05 April 1999 <br /> Advanced CcoEr»iron mental,Inc <br /> I <br />