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I <br />' 12 November 2004 <br /> . AGE-NC Project No 99-0657 <br />' Page 4 of 4 <br />' Concentrations of dissolved TPH-g Increased significantly this quarter In monitoring wells <br /> MW-1 and MW-2,but decreased In wells MW-4 through MW-6 Concentrations of BTEX <br /> compounds have decreased this quarter In wells MW-2 and MW-4, but Increased In well <br /> MW-1 MTBE concentrations decreased In wells MW-4 and MW-6, and Increased In well <br /> MW-2 <br /> • The lateral extent ofpetroleum hydrocarbon contamination In ground water has been defined <br /> Ito the east, west, and southeast of the UST area The lateral extent of Impacted soil In the <br /> vadose zone has been defined <br /> • The vertical extent of petroleum hydrocarbon-Impacted ground water Is defined off-site In <br /> the area of soil boring CPT-1 However, the vertical extent Is undefined In the area of and <br /> down-gradient from the former UST area (CPT-2 and CPT-3) <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 /> • Implementation of the AGE-prepared Monitoring Well Installation WorkPlan,dated 28 July <br /> 2004 and approved by the EHD In a letter dated 08 September 2004 If access agreements <br /> cannot be obtained in a timely manner for the off-site monitoring wells, the scope of work <br /> should be performed In two phases (on- and off-site) AGE believes the vertical definition <br /> of soil and ground water contamination on-site Is Integral to the assessment and eventual <br /> remediation of the site <br /> I <br /> I6.0. 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 /> points(Ie ground water samples) and subsurface conditions may vary away from these data points <br /> No otherwarranty,expressed or Implied,Is made as to the professional Interpretations,opinions,and <br /> recommendations contained In this report <br /> • <br /> IAdvanced GeoEnvi ron mental,Inc <br />