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1 <br /> . 30 October 2000 <br />' AGE-NC Project No 99-0624 <br /> Page 8 of 8 <br />' inferred from field observations, OVM readings, and laboratory analysis <br /> • The highest concentrations of TPH-g and MTBE are an the vicinity of the former USTs as <br />' shown by laboratory analyses of the grab ground water samples collected from borings P1, <br /> MW-3, and MW-2 <br />' 4 TPH-g and MTBE impacted ground water at all sampling points except MW-4 <br /> • Compared to the UST excavation samples, lesser concentrations of TBA and xylenes were <br />' detected in soil samples S-4-FD 1 and S-5-FD2 collected from the former dispenser island <br /> area from depths of 4 and 5 feet bsg <br /> • The former USTs are the most likely source of the hydrocarbon release <br /> I <br />' 6.0. RECOMMENDATIONS <br /> Based upon data collected during September and November 1999, AGE recommends quarterly <br />'. monitonng of ground water monitoring wells Additional subsurface assessment north, south, and <br /> east of the UST area to determine the lateral extent of petroleum hydrocarbon-impacted and <br /> MTBE-impacted soil and ground water <br /> 7.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinanly exercised by <br /> environmental consultants practicing In this or similar localities The findings were based mainly <br />' upon analytical results provided by an independent laboratory Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points(e g soil samples and ground water samples),and subsurface conditions may <br />' vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report <br /> I <br /> Advanced GeoEnviranmental,Inc <br /> I <br />