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4.0 DATA ANALYSIS <br />' v 4.1 Graphical Summary ` <br /> Monthly summaries of daily air flow rates and other parameters for the quarter are included in <br /> Appendix A In order to graphically illustrate the operation of the system, data for air flow rate <br /> since for the quarter and total cubic feet of extracted vapor since September 1995 are plotted in <br /> . Figures 3 and 4 PID readings and all 1997 laboratory results are graphed in Figure 5 to illustrate the <br /> ' effect of the system on soil vapor concentrations <br /> For most of the quarter, concentrations measured by PID from both VE-1 "shallow" and VE-2 are <br /> ' in the range of 700-1000 ppm This is down from 750-1,500 ppm during the first quarter <br /> } Laboratory concentrations in June were 38 and 21 ppm,_respectively This represents a mayor <br /> decrease since the first quarter, when concentrations were 455 and 577 ppm, respectively <br /> 4.2 Weight of VOC's Destroyed <br /> ' The weight of VOC's extracted during the quarter can be computed from the mean vapor <br /> concentration at the combined well inlet and the cumulative volume of extracted vapors The <br /> average concentration measured at the combined inlet on the 11 measurement days was 857 ppm <br /> WEIGHT OF VOC'S=CF x {VAPOR} x 10-6 x 100 mol/wt <br /> 379 cf/mole <br /> r =4 967 x 106 ft3 x 857 x 10-6 x 100 mol/wt <br /> 379 cf/mole <br /> ' =4 256 x 10 5lbs <br /> 3 79 x 102 = 1123 lbs <br /> ' 5.0 GROUNDWATER MONITORING <br /> 5.1 Monitoring Procedures <br /> ' The depth to groundwater was measured on June 18, 1997 and the results are shown on the Well <br /> Monitor Report(.Appendix Q and in Table 1 _ <br /> Water samples were collected from MW-5 and VE-1 "deep" on that date Two 40-m1 sample vials <br /> were collected from each well and were delivered to Sequoia Analytical in Sacramento However, <br /> in accordance with the recent recommendation of Mr Alan Patton of the State Water Resources <br /> 4 <br /> 1 ' <br />