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1 <br /> Ile 20 April 2000 <br /> AGE-NC Project No 95-0143 <br /> Page bof6 <br />' extraction The ground water mounding appears to be caused by vapor extraction, not from <br /> air sparging <br />' TPH-g was detected at concentrations ranging from 1,400 ,ug/l to 980 ,ugll in the three soil <br /> vapor samples analyzed from the intake to the SVE unit <br /> • As of 31 March 2000, the SVE system has operated for a total of 3319 hours and has <br />' extracted a total of approximately 699 gallons of gasoline <br />' 50 RECOMMENDATIONS <br />' Based upon data collected during the February 2000 and previous sampling events and SVE system <br /> monitoring results, AGE recommends <br />' Continued quarterly-monitoring of the ground water monitoring well system on the site The <br /> next quarterly monitoring will be scheduled for May 2000, concurrent with monitoring at the <br /> Ile Madison <br /> site <br /> Continued operation and monitoring of the SVE and IAS systems at the site <br /> 1 <br /> 60 LIMITATIONS <br /> 1 Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing an this or similar localities The findings were based mainly <br /> 1 upon analytical results provided by an Independent laboratory Evaluations of the soil and ground <br /> �A ater conditions at the site have been made from a limited number of available data points (i e <br /> ground water samples and measurements and SVE system monitoring points), and subsurface <br /> 1 conditions may vary through time and with distance from these data points No other warranty, <br /> expressed or implied, is made as to the professional recommendations contained in this report <br /> I <br /> I <br /> I <br /> Adtianced GcoEnrironmcntal,Inc <br />