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f ' 14 September 2004 AGE-NC Project No 03-1100 Page 4 of 9 • TPH-g in accordance with EPA Method 8015 Modified and • BTEX, MTBE and 1,2 DCA in accordance with EPA Method 8260B Laboratory reports for vapor and ground water analyses,testing methods,laboratory QA/QC reports, and sample chain of custody documentation will be presented in monthly reports In order to maximize the efficiency of the clean-up effort, a 24-hour/day operation of the system is planned Atypical destruction rate of greater than 98%of hydrocarbon vapors is expected throughout the entire cleanup duration The SVE system will be physically maintained on a weekly basis according to manufacturers recommendations (i e lubrication, oil changing, system adjustments, etc ) 2 6 PROGRESS/CONFIRMATION SAMPLING Monthly ground water monitoring and sampling will be performed at the site on all associated ground water monitoring wells throughout the remediation period to monitor remediation progress Depth to ground water and dissolved oxygen measurements will be collected on a monthly basis to determine if ground water mounding is occurring as a result of the IOS system After approximately six-months of operation or after efficiency of the SVE unit has declined, soil samples will be collected from the area of petroleum-hydrocarbon impact at the site Analytical results of soil samples will serve to assess the remaining petroleum hydrocarbon mass and to determine if continued remediation efforts are required Selected soil samples will be analyzed by a DHS-certified laboratory for the following constituents • TPH-g in accordance with EPA Method 8015 Modified, and • BTEX, MTBE and 1,2-DCA in accordance with EPA Method 8260B Laboratory reports for soil analysis, testing methods, laboratory QA/QC reports, and sample chain of custody documentation will be presented in a report with findings and recommendations 1 Advanced GcoEnvironmental,Inc