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lie <br /> 20 December 2001 <br /> AG - <br /> E NC Protect No 01-0827 <br /> Page b of 8 <br />' inches of water was measured in the piping between the blower and extraction wells An induced <br /> vacuum of approximately 0 2 inches and 0 015 inches was measured at well MW-1 and MW-3, <br /> distances of 10 feet and 45 feet,respectively, from the extraction wells The SVE unit operation was <br /> continuous over the quarter, except during repairs <br /> The analytical results are summarized on Table 3 The laboratory reports (PET Sample Numbers <br />' PEI 3195-01 and 02,PEI 3257-01 and MAI Sample Numbers 82741 and 82742)Quality Assurance <br /> and Quality Control (QA/QC) reports and chain-of-custody forms are included in Appendix D <br /> rExtracted organic vapor concentrations measured with the OVM were similar when compared to the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor measured <br /> with the OVM was 180 ppm <br /> 34 MASS OF RECOVERED HYDROCARBONS <br /> The hydrocarbon mass (TPH-g) removed during the operating period was calculated using the <br /> following equation M = C•Q•t <br /> where M = cumulative mass recovered (kg) <br /> C = soil-vapor concentration (kg/m') <br /> Q= extraction flow rate (ma/hr) <br /> t = operational period, in hours <br /> The estimated mass of hydrocarbons removed was based on laboratory analysis of soil-vapor samples, <br /> the flow rate and operational time The mass of extracted hydrocarbons was calculated for the time <br /> period using average hydrocarbon concentrations of influent soil-vapor sample data,averaged air flow <br /> rates and duration of operation The operational results are summarized on Table 1 <br /> r <br /> Approximately 38 kg or 13 gallons of hydrocarbons were extracted and destroyed by the SVE <br /> network between 11 October 2001 and 05 November 2001 The volume and mass calculations are <br /> attached in Appendix E <br /> 3 5 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 'I he elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 3) <br /> Depths to ground water ranged from 21 87 to 22 85 feet below the well casing tops The relative <br /> Advanced GeoLnvironmental,Inc <br />