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t { <br /> • <br /> 27, September2004 <br /> AGE-NC Project No 95-0142 <br /> Page 4 of 7 <br /> • August TPH-g, toluene and total xylenes were detected in the 02 August effluent sample at <br />' concentrations of 78 µg/1, 0 66 µg/1 and 0 43 µg/1, respectively TPH-g and total xylenes <br /> were detected in the 18 August effluent sample at concentrations of 44 µg/l and 0 14 µg/1, <br /> respectively , <br /> The analytical results are summarized in Table 2 The laboratory reports(CTEL Project No 0404196 <br /> and MAI Work Orders 0405299, 0406370, 0407302, and 0408256)Quality Assurance and Quality <br />' Control (QA/QC) reports and chain of custody forms are Included in Appendix B r <br /> t = <br /> Hydrocarbon concentrations measured in samples from the effluent stream from the catalytic <br />' oxidizer SVE system Indicated a minimum 95 percent rate of destruction Concentrations of , <br /> extracted organic vapor measured with the OVM were low compared to the analytical results from f, y <br /> the soil-vapor samples The highest concentration of organic vapor measured with the OVM was <br />' 32 parts per million by volume (ppmv) , <br /> 32 SVE MASS OF RECOVERED HYDROCARBONS , <br /> The hydrocarbon mass (TPH-g) removed dunng_the operating period was calculated using the <br /> lie 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 (m3/hr) <br /> t = operational period, in hours <br /> The operational time was divided Into three time periods Mass of hydrocarbons removed was based I <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 sample data and average air <br /> flow rates Approximately26 gallons ofhydrocarbons as gasoline were extracted and destroyed from <br /> the SVE network at!the site between February andAugust 2004 The volume/mass calculations`are ; <br /> attached in Appendix C <br /> FF <br /> 33 ' GROUND WATER TREATMENT RESULTS <br /> Between 21`April and 18 August 2004,the pump-and-treat system was operational Utilizing a Blue- <br /> White Industries F-2000 flow meter, a total flow of 273,247 gallons(totalizer)was recorded during <br /> ' the aforementioned period (Table 3) Based on the discharged water recorded on the,meter, AGE <br /> estimated that approximately an average of 2,200 gallons of water were discharged per day <br /> � r <br /> Advanced GeoEnvironmental,Inc <br /> I" <br /> J <br />