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15 rune 2004 <br /> AGE-NC Project No 95-0142 <br /> Page 11 of 12 <br /> • Dissolved hydrocarbons were detected from ground water samples collected at the Influent <br /> end of the treatment system and based on the amount of ground water processed and <br /> laboratory analytical results, approximately 3 2 lbs of benzene and 18 7 lbs of TPH-g were <br /> removed from the extracted ground water <br /> • Ground water remediation was Initiated at the site in early February 2003, while the pump- <br /> and-treat system was in operation for approximately 80 days,approximately 231,216 gallons <br /> of water were processed AGE estimates that an average 2,800 gallons of water was <br /> discharged per day during this time <br /> • Historically,the highest concentration of dissolved petroleum hydrocarbons was In the area <br /> of the former UST TK1-90 (well VW-1) TPH-g and BTEX concentrations have steadily <br /> declined to non-detect in the samples collected from the deep screened well MW-6(screened <br /> 70 to 80 feet bsg) Presently, MW-6 is screened approximately 45 feet below the surface of <br /> first-encountered ground water <br /> • Monitoring wells MW-6, MW-7 and MW-8 are screened approximately 45 feet below the <br /> surface of first-encountered ground water MTBE has been detected in the samples collected <br /> from well MW-7 for six consecutive quarters, but has not been detected in the samples <br /> collected from well MW-6, beneath the former UST area <br /> • The distribution of MTBE suggests that the MTBE plume has laterally migrated to well <br /> MW-5 and vertically migrated to well MW-7 <br /> 5.0. RECOMMENDATIONS <br /> Based upon the data collected to date, AGE recommends <br /> • Continued operation of the ground water extraction system and soil vapor extraction system <br /> at the site <br /> • Continued quarterly ground water monitoring at the site The next quarterly ground water <br /> sampling and monitoring event should be scheduled for May 2004 <br /> G.O. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an Independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of data <br /> Advanced GeoEnvironmental,Inc <br />