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' Page 5 <br /> Mr Ron Rowe <br />' July 6, 1998 <br /> SUMMARY <br />' The extent of petroleum-impacted groundwater has been delineated, and appears <br /> to be contained solely within the Earthgraxn's property boundary Current BTEX <br /> concentrations measured in samples collected during this quarterly monitoring <br />' event are consistent with a decreasing or stable trend of petroleum impact <br /> observed at this site From 1992 to the present, TPH-G concentrations have <br /> decreased almost four-fold, and benzene concentrations by two to six times in <br />' samples collected from monitoring well MW-1 Previously collected <br /> biodegradation assessment data and other general trends suggest that the <br /> significant petroleum concentration decreases at this site are a largely a result of <br /> initial source removal, natural aerobic and anaerobic microbial activity <br />' Oxygenate parameters TBA, MTBE, ETBE, and TAME were not detected in site <br /> groundwater samples DIPE was detected in two groundwater samples at <br />' concentrations ranging from 11 µg/L to 12 pg/L The relative magnitude of these <br /> concentrations can not be evaluated because there is no currently established <br /> regulatory cleanup objective for DIPE The extent of DIPE impact appears to be <br /> in close proximity to the source of the petroleum release <br /> CLOSING <br />�. Philip and Earthgrains will continue to provide requested information to the <br /> SJCEHD in an effort to assess the best method to ultimately attain case closure for <br /> this site Future groundwater monitoring will be performed on a semi-annual <br />' basis, as agreed to by the SJCEHD Following the submittal of this report, we will <br /> be following up with a telephone call to the SJCEHD to determine the next step in <br /> our continuing work to close this facility If you have questions, or desire <br /> additional information, please call Mark Milward of Philip at (618) 281-7173 <br />' Sincerely yours, <br /> PHILIP SERVICES CORP <br />' Mark F Milward <br /> Hydrogeologist <br />' 1vgcl2NDQTR98 DOC <br /> Attachment 1 Figures <br /> 2 Tables <br />' 3 Groundwater Sampling and Analysts Procedures <br /> 4 Water Sample Field Data Sheets <br /> 5 Laboratory Reports and Chain-of-Custody Documentation <br /> i <br /> i <br /> E/121382/125997/2ndQtr98 doc <br />