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08 May 1997 <br /> AGE-NC Project No 96-0173 <br />' Page 4 of 4 <br />' detected due to raised detection lints <br /> The laboratory reports for the past two quarters suggest that detected TPH-d is the result of <br /> gasoline interference <br />' S.O. RECOMMENDATIONS <br /> Based upon data collected during the April 1997 sampling event, AGE recommends the following <br /> 9 Additional ground water monitoring wells, screened appropriately above surface ground <br /> water, will be required off the site in all directions <br /> I • A work plan for the installation of two soil vapor extraction (SVE) wells and one air sparging <br /> point was subnutted to the PHS-EHD Upon approval, the SVE wells and the air sparging <br /> point should be immediately installed for performance of an SVE/air sparging pilot test <br /> • Laboratory analysis of dissolved TPH-d at the site has indicated that the detection of TPH-d <br /> is the result of gasoline interference As a result, analytical results from any TPH-d analysis <br /> are ambiguous Therefore, TPH-d should be discontinued from future sampling events <br /> • MTBE in ground water samples should be confirmed at least once utilizing EPA method <br /> 8260 <br /> The next quarterly ground water monitoring and sampling event at the site should be <br /> scheduled for June 1997 <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> Ienvironmental consultants practicing in this or similar localities The findings were based mainly upon <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydro- geologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of available <br /> data points (e g ground water samrnli-0 and subsurface conditions may va T a;.'ay from these data <br /> points No other warranty, expressed or implied, is made as to the professional recommendations <br /> Icontained in this report <br /> I <br />