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ATC Associates Inc <br /> Lone Palm Avenue, Surte B <br /> VModesto, Califorma 95351 <br /> 209-579-2221 <br /> ' A S S O C I A T E S 1 w C Fax 209-579-2225 <br /> ' Control District permit to operate Vapor sample laboratory analytical data are summarized in Table 3 <br /> and laboratory data sheets are included m Attachment 4 <br /> ' Soil Vapor Extraction System Evaluation <br /> From June 16, 2006 to September 27, 2006, the system was operational for 1,102 80 hours During <br /> ' the third quarter of 2006, the average extracted vapor flow rate was 202 67 cubic feet per minute <br /> (SCFM) and the average influent vacuum achieved by the catalytic oxidizer was approximately 4 3 <br /> inches of mercury <br /> ' TPHn <br /> Assuming an average influent flow rate of 202 67 SCFM and average influent TPHg concentration <br /> of 380 00 PPMv, the total mass of TPHg removed from the system between June 16 and <br /> September 27, 2006 is 1,119 49 pounds Since startup on September 6, 2005 TPHg recovery has <br /> been 14,570 71 pounds <br /> Benzene <br /> Using the average influent flow rate of 202 67 SCFM and average influent benzene concentration <br /> of 0 28 PPMv, the total mass of benzene removed from the system between June 16 and <br /> September 27, 2006 is 0 75 pounds Since startup on September 6, benzene recovery has been <br /> 24 36 pounds <br /> ' Toluene <br /> ' Using the average influent flow rate of 202 67 SCFM and average influent toluene concentration <br /> of 2 19 PPMv, the total mass of toluene removed from the system between June 16 and September <br /> 27, 2006 is 6 89 pounds Since startup on September 6, toluene recovery has been 15174 <br /> ' pounds <br /> Ethvlbenzene <br />' Using the average influent flow rate of 202 66 SCFM and average influent ethylbenzene <br /> concentration of 1 18 PPMv, the total mass of ethylbenzene removed from the system between <br /> June 16 and September 27, 2006 is 4 28 pounds Since startup on September 6, ethylbenzene <br />' recover has been 52 19 pounds <br /> Total Xylenes <br />' Using the average influent flow rate of 202 67 SCFM and average influent xylenes concentration <br /> of 13 53 PPMv, the total mass of xylenes removed from the system between June 16 and <br /> September 27, 2006 is 49 05 pounds Since startup on September 6, the total xylene recovery has <br /> been 378 80 pounds <br /> Calculations for contaminants extracted from soil are summarized in Table 4 <br /> S 154 29519001�0&M11st-qtr-2005 doc 6 <br />