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Report—Remedial Action Feasibility Page 15 <br /> Cutter Lumber—Western Lift Site <br /> IleGPE Project No 102 3 <br /> August 1,2003 <br /> The result shows a clear relationship between the two data sets The software used to <br /> generate the cross-plot (MS-Excel) was also used to generate a best-fit correlation curve <br />' and to derive an empirical equation for the correlation As shown in the figure, there is a <br /> good exponential correlation and the empirical formula of the equation can be re-stated <br /> as <br />' r PID—92 544 <br /> 42 764 <br />' mg/L = 2 <br /> Where PID is the raw reading taken in the field in ppm <br /> And mg/L is the reading corrected to absolute concentration <br /> 6.1.1.1 VES Radius of Influence <br /> Field data is summarized as Summary Table 3 As described above, a Magnahelic gauge <br /> was used to monitor the vacuum on the observation wells Dunng the period when only <br />' the vapor extraction system was in operation, no discernable vacuum draw down was <br /> noted in any other well Based in this, we can only say that the radius on influence of the <br />' vapor extraction well was Iess than 19 feet, the distance between VEW-1 and MW-8B <br /> 6.1.2 Air Sparge Radius of Influence <br />' At the time the sparge system was stared, the vapor extraction system was shut down <br /> briefly to obtain positive pressure measurements using Magnahelic gauges Pressures <br /> were measured at wells MW-6, MW-7 and MW-8B The results are included in <br /> Summary Table 3 The information was then used to calculate the effective radius of <br /> influence of the vapor extraction system A log-normal scatter plot was generated that <br /> compares the natural log of the distance from the extraction well (ASW-1) with the <br />' average of the measured vacuum The result is shown on Cross-Plot 2 Projecting the <br /> trend established by the two observations wells to the point where 1 inch of vacuum <br /> would be encountered, the radius of influence would be about 40 feet <br /> 80 Radius of influence-Vapor Extraction <br /> 70 <br /> 3 60 <br />' o so <br /> y=-47 003Ln(x)+ 76 2 <br /> 2 40 <br /> a <br /> 30 <br /> 20 <br /> 0 <br /> 10 <br />' 0 <br /> I 10 l00 <br /> . Distance from Extraction Well[Ft 1 <br />' 2937 Veneman Ave , #13240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br /> 1 <br />