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1 <br /> 13 December 1999 <br /> ' AGE-NC Project No 95-0137 <br /> Page 4 of 5 <br /> MTBE was reported in the ground water sample collected from well MW-3 at a concentration of 3 4 <br />' µg/l DIPE and TBA were also reported in various samples collected during the October 1999 <br /> monitoring event at concentrations up to 6 9µg/1 and 170µg/1, respectively ETBE and TAME were <br /> not reported In samples collected from the site <br /> Petroleum hydrocarbons and fuel oxygenates were not detected above the reporting limits in the <br /> sample collected from the domestic well on the Jimco site <br /> Analytical results from ground water samples for each monitoring event analyzed by EPA Methods <br />' 8015 Modified and 8020 are summarized in Table 2 Analytical results for ground water samples <br /> analyzed by EPA Method 8260 Modified are summarized in Table 3 A copy of the laboratory report <br /> (MAI Lab ID Numbers 23553 through 23565), quality assurance and quality control (QA/QC) and <br />' chain-of-custody form are included in Appendix B <br />' 4.0 CONCLUSIONS <br /> Based upon data collected during the October 1999 monitoring event, AGE concludes <br /> M • The greatest concentrations of dissolved petroleum hydrocarbons in shallow ground water <br /> appears to be in the areas of MW-2 and MW-3 <br /> • Analytical results of ground water samples collected from the air sparging wells (VW-1B, <br /> VW-2B), screened between 30 and 35 feet bsg, indicate that the dissolved hydrocarbon <br />' plume extends at least 15 feet into the saturated zone <br /> • MTBE, reported at low concentrations only in MW-3, does not appear to be widespread at <br />' the site <br /> 5.0 RECOMMENDATIONS <br /> ' Based upon ground water data collected from the site, AGE recommends the following <br /> • Advancement of at least one additional soil boring in the area of VW-1B and VW-2B to <br />' investigate the vertical extent of dissolved hydrocarbons The boring should be advanced to <br /> a depth of at least 50 feet and depth-discrete ground water samples should be collected <br /> • The next monitoring event should be scheduled for January 2000 The RFS and Junco Truck <br /> Stop monitoring should be coordinated and data from both sites combined to develop more <br /> comprehensive illustrations of ground water flow elevations and the lateral extent of <br /> dissolved hydrocarbons <br /> Advanced GeoEnvironmental,Inc <br />