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28 November 2005 <br /> AGE-NC Project No 99-0657 <br /> Page 4 of 5 <br /> I0 The highest concentrations of dissolved hydrocarbons occurred in monitoring wells MW-1 <br /> and MW-4, which are located at or down-gradient of the UST area Concentration maps <br /> depicting the approximate distribution of dissolved TPH-g,benzene, MTBE, and 1,2-DCA <br /> are Illustrated on Figures 4 through 7, respectively <br /> • Concentrations of dissolved TPH-g decreased this quarter In monitoring wells MW-1 and <br /> perimeter well MW-5 TPH-g Increased in wells MW-2,MW-4,and MW-6 Concentrations <br /> of benzene decreased in wells MW-4 and MW-5, and decreased to non detect in samples <br /> from well MW-1 since the previous monitoring event The concentration of benzene in well <br /> MW-2 increased from non-detect to 18 µg11 this quarter <br /> • MTBE concentrations decreased in wells MW-1,MW-2,and MW-4,and increased from non <br /> detect in well MW-3 1,2-DCA concentrations decreased in wells MW-1 and MW-4, and <br /> increased slightly in well MW-6 <br /> • No target analytes were detected at or above laboratory reporting limits in the ground water <br /> samples analyzed from deep Interval wells MW-10 and MW-11 <br /> • The lateral extent of petroleum hydrocarbon contamination in ground water has been defined <br /> to the east, south and north (CPT-1) of the UST area The lateral extent Is not fully defined <br /> to the west of the UST arca beyond wells MW-5 and MW-6 (Figures 4 through 7) <br /> • The vertical extent of petroleum hydrocarbon-impacted ground water is defined off-site in <br /> the area of soil boring CPT-1 The vertical extent of petroleum hydrocarbon-impacted ground <br /> water Is defined on-site by wells MW-10 and MW-11 <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br /> • Continuation of the quarterly ground water monitoring program, as required by the EHD <br /> • Preparation of a remediation feasibility report for soil and ground water <br /> I <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 GeoEnwonmentnl,Inc <br />