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25 February 2004 <br /> AGE-NC Project No 95-0130 <br /> Page 6 of 7 <br /> this former north UST area was defined by samples from well MW-7 This model Is shown <br /> In Figures 8 and 9 <br /> • The release of petroleum hydrocarbons from the former south UST pit is defined only north <br />' by vapor well VW3 and lesser by samples near EW-I and MW-6 The vertical extent of the <br /> contaminants In the former south UST area Is not defined towards the south, east and west <br />' • The petroleum hydrocarbon-Impacted soil appears to extend horizontally from the UST area <br /> to MW-3,a minimum distance of approximately 30 feet toward the northeast The detection <br /> of only TPH-g and benzene, at concentrations of 16 mg/kg and 0 054 mg/kg, respectively, <br />' is suggestive of the soil-plume margin <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • Continued quarterly ground water monitoring of wells VW-1 (B and C), VW-2A, VW-3A, <br />' MW-6 (A-E) and MW-7 (A-E) The first quarter 2004 ground water monitoring event has <br /> already been performed on 09 February 2004, a second quarter 2004 ground water <br /> monitoring event is tentatively scheduled for 12 May 2004 <br />' • Conduct future ground water monitoring events concurrently with the Knowles/Roek <br /> Property site (102 South Wilson Way) and the Arco AM/PM site (130 South Wilson Way), <br />' • Continued quarterly depth-to-water measurements in all monitoring wells at the site, but <br /> reduced ground water sampling frequency from a quarterly to a semi-annual program, AGE <br /> believes that continued quarterly ground water sampling from these wells at this stage of the <br />' investigation is not cost effective and will not provide enough useful information to <br /> supplement the ongoing investigation Semi-annual sampling events should be adequate to <br /> monitor ground water impact at these wells and should be re-evaluated on a semi-annual <br />' basis <br /> • Implementation of interim soil and ground water remediation utilizing ground water <br />' extraction wells EW-1 and EW-2 and soil vapor extraction wells VW-1, VW-2,VW-3,with <br /> addition of one vapor well (VW-4) approved in the Feasibility Studies and Monitoring <br /> Installation Work Plan dated 11 March 2002, approved by the EHD <br /> 1 <br />' Advanced Geo Envi run mental,Inc <br /> 1 <br />