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i26 July 1999 <br /> . AGE-NC Project No 96-0235 { <br /> Page 4 of 5 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds <br /> • Petroleum hydrocarbons were detected in MW-1, MW-2 and MW-3, screened below the <br /> current ground water surface, at the lustorical ground water depth Hydrocarbons were not ' <br /> i detected in MW-6B and MW-8B, screened near the historical ground water depth, defining <br /> the dawn-gradient,lateral extent of impacted ground water at this depth toward the northwest <br /> and north MW-3 appears to be near the margin of the impacted deep ground water plume <br /> itoward the west <br /> • Petroleum hydrocarbons were not detected in MW-4, MW-5, MW-6A, MW-7 or MW-8A, <br /> i screened at the current ground water surface <br /> • The depth to ground water in MW-6B was lower than expected, based upon surrounding <br /> wells MW-6B also exhibits slow recharge Ground water may not have stabilized in this <br />' well following removal of the well cap and prior to measurement <br /> Ground water in MW-1, MW-2, MW-6B and MW-811 does not appear to be in direct <br />'. hydraulic communication with the ground water in MW-4,-MW-S, MW-6A, MW-7 and <br /> MW-8A Monitoring well MW-3, screened from 30 to 55 feet bsg may be in hydraulic <br /> communication with all wells at the site <br />' • impacted deeper ground water appears to be centered in the area near MW-2 and MW-1, <br /> migration toward the southwest to southeast may be possible Vertically, impacted ground <br />' water appears to be constrained to historic low ground water elevation of 40 to 50 feet bsg <br /> The impacted ground water plume does not appear to be migrating laterally or vertically x <br />' 5.0. RECOMMENDATIONS <br />' Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • A work plan for further investigation has been submitted to the PHS-EHD Upon approval, - <br />' of the work plan, additional soil bonngs will be advanced at the site and grab water samples <br /> collected , <br />' • Continued quarterly monitoring of the ground water monitoring wells on-site The next <br /> monitoring event should be performed in August 1999 <br /> ' r <br /> Advanced GeolErnvironmental,Inc <br />