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' 25 April 2005 <br /> AGE-NC Project No 95-0128 <br />' Page 7 of 8 <br /> Extracted organic vapor concentrations measured with the OVM were low when compared to the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor measured <br /> with the OVM was 887 ppm from the influent of the SVE system during the initial momtonng event <br /> (Table 2) <br />' 3 4 MASS OF RECOVERED HYDROCARBONS - SVE <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/m3) <br /> Q= extraction flow rate (m3/hr) <br /> t= operational period, in hours <br /> The estimated mass of hydrocarbons removed was based on laboratory analysts of soil-vapor <br /> . samples,the flow rate and operational time The mass of extracted hydrocarbons was calculated for <br /> the time period using average hydrocarbon concentrations of influent soil-vapor sample data, <br /> averaged air flow rates and duration of operation The operational results are summarized in Table 2 <br /> A calculated 1,509 kg(3,327 pounds), or an approximate volume of 532 5 gallons of hydrocarbons <br /> as gasoline were extracted by the SVE system between 25 January and 23 March 2005 The volume <br /> 1 and mass calculations and the concentration trends of the influent samples over time are displayed <br /> in Appendix F <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of remediation operation <br /> • A volume of 663,858 gallons of water were extracted between 14 December 2004 and 23 <br /> March 2005 A total of 2,712,799 gallons of water have been extracted since the inception <br /> of ground water treatment in October 2001 <br /> During the reporting period,approximately 0 186 lbs of MTBE and 0 04 lbs of benzene and <br /> 169 lbs of TPH-g were removed from the site and treated by the ground water extraction <br /> system A total of 10 54 lbs of MTBE, 4 81 lbs of BTEX and 73 12 lbs of TPH-g have been <br /> removed since October 2001 <br /> 1 Advanced GeoEnvironmental,Inc <br />