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i <br />' 22 February 1999 <br /> • AGE-NC Project No 96-0263 <br /> IPage 7 of 8 <br />' north and somewhat northwest <br /> • The most intensely hydrocarbon-Impacted soil was encountered in the area of the former <br /> dispenser Soil contaminated with petroleum hydrocarbons was limited to depths of 32 feet <br />' bsg(MW-6) While the highest hydrocarbon concentrations detected in soil was in the former <br /> UST area, encountered at a depth of 10 feet bsg <br />' 0 MTBE was detected in soil collected at depths ranging from 5 feet bsg to 28 feet bsg by EPA <br /> Method 8020, and in the former UST area to depths of 20 feet bsg MTBE was detected in <br /> soil collected at depths ranging from 5 feet bsg to 32 feet bsg by EPA Method 8260 <br />' Modified <br /> • The highest concentration of dissolved hydrocarbons quantified as TPH-g, MTBE and <br /> I overall BTEX compounds extends northward from the former UST and dispenser areas <br /> Dissolved hydrocarbons were encountered in the presumed down-gradient direction from the <br /> former USTs to the location of monitoring wells MW-5 and MW-8 TPH-g and BTEX <br />' concentrations in ground water decrease northward in the area of well MW-8 and decrease <br /> to less than detectable concentrations south and west of the former USTs, in the area of wells <br /> 0 MW-1 and MW-3, respectively <br />' The lateral distribution of dissolved benzene and MTBE can be approximated Figures 8 and <br /> 9 depict the approximate areal distribution of impacted ground water exceeding 100 ,ug/l of <br />' MTBE or benzene <br /> • Analytical data from the site assessment Indicates that remediation of soil and/or ground <br /> water may be required at the site <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> IContinued quarterly monitoring of the ground water monitoring wells The next monitoring <br /> event should be performed in April 2000 <br />' 6.0. 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 Evaluation of the hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> Advanced GeoEnviron mental,Inc <br /> I <br />