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1 <br /> Atlantic Richfield Company 4 <br /> ' ARCO Service Station 4912.16 East Harding Way,Stockton,CA - May10.2061 <br /> . MPE Mass Removal Rates <br /> ' The total mass of TPHg, benzene, and MTBE removed during the test were calculated <br /> using the influent air analytical results, an average flow rate, and the time of the test <br /> The calculated TPHg, benzene, and MtBE mass removed during the MPE test was <br /> ' approximately 544 3 pounds, 19 5 pounds, and 440 pounds, respectively (Table 6) <br /> Vapor Extraction Radius of Influence <br /> ' The maximum radius of influence for each extraction well was estimated based on the <br /> observation well vacuum data, assuming a semi-logarithmic relationship between <br /> ' vacuum influence and distance from the source well The minimum vacuum influence <br /> for effective MPE was set at 0 1 inches of water column Assuming a fully confined <br /> radial gas flow system, the following equation was used to estimate the radius of <br /> influence <br /> P2 _P2 _ P2 P2 ln(rl RW) <br /> ' r w — ( Rl — W ln(RI /Rx,) <br /> ' Where <br /> Pr = pressure at a radial distance r from the vapor extraction well <br /> PW = pressure at the vapor extraction well <br /> '• PRI = pressure at the radius of influence <br /> r = radial distance from the vapor extraction well <br /> RI =radius of influence where pressure is equal to a preset value <br /> ' RW = well radius of the vapor extraction well <br /> ' Solving for R1 in the above equation yields an estimate of the radius of influence and <br /> was used to calculate the radius of influence for each extraction well The maximum <br /> applied vacuum and flow rates were used to calculate the radius of influence for each <br /> ' well Calculated radii of influence are included in Tables 2 through 4 <br /> I <br /> I <br /> r'0 <br /> ' ARCO 4932/WE test doc <br />