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1 <br />' 15 September 1998 <br /> AGE-NC Project No. 95-0100 <br /> tPage 4 of 5 <br />' Concentrations of extracted organic vapor measured with the OVM were low compared to the <br /> analytical results from soil-vapor samples.The highest concentration of organic vapor measured with <br />' the OVM was 940 ppmv, measured during the April sampling event. <br />' 3.2. 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/m3) <br /> Q=extraction flow rate (m3/hr) <br /> t= operational period, in hours <br /> The operational time was divided into three time periods. Mass of hydrocarbons removed was based <br />' on analysis of soil-vapor samples. The mass of extracted hydrocarbons was calculated for each time <br /> period using average hydrocarbon concentrations of influent soil-vapor samples collected and <br /> average air flow rates. <br /> Approximately 96 gallons of gasoline were calculated to have been removed between 25 February <br /> and 28 April 1998; 169 gallons of gasoline were removed between 28 April and 06 June 1998; and <br /> ' 108 gallons of gasoline were extracted between 04 June and 30 June 1998. A of total 373 gallons <br /> of hydrocarbons as gasoline were removed from the site. The mass calculations are attached in <br /> Appendix B. <br /> ' Concentrations of extracted volatile organics measured with the OVM correspond only roughly to <br /> analytical results obtained from the influent stream soil-vapor samples. <br /> 1 <br /> 4.0. SUMMARY/CONCLUSIONS = <br /> t <br /> Based upon data collected from the site, AGE concludes: <br /> = �- -- - - =- - �W mow.. _. . .. . <br /> • The highest concentrations of petroleum hydrocarbon soil-vapors-detected were produced <br /> during the third month of the SVE operation.No soil-vapor samples were collected in March <br /> ' and May 1998, due to disrupted SVE operation. <br /> • Over the first quarter approximately 373 gallons of gasoline were removed from the site. <br /> Advanced Geo£nvironmental,Inc. <br />