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I15 December 2003 <br /> • AGE-NC Project No 95-0173 <br />' Page 6 of 9 <br />' water Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured at <br /> concentrations as high as 1,560 parts per million (ppm) at regular intervals at the SVE inlet Field <br /> measurements are summarized in Table 6 <br /> 5 <br /> 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> 1 Influent and effluent SVE air flow samples were collected on 23 June,on 24 July,on 13 August and <br /> on 09 September 2003 TPH-g was detected in all four influent SVE air flow samples at <br />' concentrations of 200 p.g/l,210µg/l, 180 µg/1 and 2,600 gg/l,respectively TPH-g was also detected <br /> in the September 2003 effluent air flow sample at a concentration of 220 p.g/l <br /> i <br />' Various BTEX constituents were detected in all four of the above influent SVE air flow samples at <br /> concentrations as high as 130 ltg/l (xylenes, 09 September 2003), benzene was only detected in the <br /> August and September 2003 influent air flow samples at concentrations of 0 28 �tg/l and 5 6 µg/1, <br /> 1 respectively Low concentrations of toluene and xylenes were detected from the September 2003 <br /> effluent SVE air flow samples at concentrations of 3 2 µg/1 and 2 µg/l, respectively <br />' Analytical results of SVE air samples are summarized in Table 5 The laboratory reports <br /> (McCampbell Analytical Inc work ordernos 0307436,0308206 and 0309165)and chain-of-custody <br />' forms are presented in Appendix D A plot of laboratory analysis of SVE influent TPH-g air stream <br /> concentrations versus time is included with Appendix E <br />' 45 MASS CALCULATION OF RECOVERED PRODUCT <br />' The hydrocarbon mass removed during the SVE operatzngperiod was calculated using the equation <br /> M= C•Q•t <br />' where M =cumulative mass recovered (kg) <br /> C =vapor concentration (kg/m3) <br /> Q = extraction flow rate (m3/hr) <br /> t=operational period, in hours <br /> Between 23 June 2003 and 09 September 2003, the SVE unit operated a total of 1,877 hours <br />' (Table 6) The average analytical results (approximately 798 µg/l) of the influent SVE air flow <br /> samples(Table 5), average flow rates(approximately 101 scfrn, Table 6)and the operational period <br /> (1,877 hours)were used to calculate the approximate mass of extracted gasoline during this period <br />' Advanced GeoEnvironmental,Inc <br />