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1 <br />' 27 October 2000 <br />' AGE-NC Project No 95-0143 <br /> Page 6 of 6 <br />' effectiveness of the horizontal vapor extraction system. Additionally, the exposed screened <br /> intervals of the vertical extraction wells were within a sandy to clayey silt layer, the <br /> characteristics of which, combined with the high ground water elevation, may lunit the <br />' effectiveness of the vertical vapor extraction wells A plot of soil vapor concentrations versus <br /> average depth to ground water during operation of the SVE system is included as Appendix <br />' F <br /> * During this quarter the SVE operation removed approximately 17 gallons of gasoline, but <br /> only operated a total of 699 hours <br />' 0 The SVE and IAS units have returned to normal operation Utility and system maintenance <br /> issues have been resolved <br />' 0 The remediation system should be modified to compensate for the high ground water <br /> elevation to enhance the effectiveness of the system <br /> I <br /> 5.0. RECOMMENDATIONS <br /> I • Based upon data collected during the August 2000 and previous sampling events and SVE system <br /> monitoring results, AGE recommends <br />' a Continued quarterly monitoring of the ground water monitoring well system on the site The <br /> next quarterly monitoring will be scheduled for November 2000, concurrent with monitoring <br /> at the Madison site <br /> • Continued operation and monitoring of the SVE and IAS systems at the site <br /> IAGE has a work plan in preparation to enhance the performance of the SVE/IAS system currently <br /> in operation to compensate for the rise of ground water elevation <br /> I6.0. LDUTATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> I environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the soil and ground <br /> water conditions at the site have been made from a limited number of available data points (i e <br /> I ground water samples and measurements and SVE system monitoring points), and subsurface <br /> conditions may vary through time and with distance from these data points No other warranty, <br /> expressed or imphed, is made as to the professional recommendations contained in this report <br /> Advanced CeoEnvuo=vntai,Inc <br /> I <br />