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' Report—Fist Phase Remedial System Page 16 <br /> Former Manna Pro Site <br />' Project No 2013 <br /> • June 18,2002 <br />' The followingrah depicts th <br /> g p p e PID calibration data <br />' Cross-Plot 1 <br /> PID Calibration Chart <br /> t y = 327 02Ln(x) + 634 18 <br /> 1200 <br /> a 1000 =3 2==--- <br /> a - --- --- -- — _ _= --_ - <br /> 800 <br /> � <br /> 400 <br /> _i- <br /> 1 0 200 22 <br /> CL -- ----- - �- - -- -- - <br /> 1 01 1 10 <br /> i TPH-G Lab Results (mg/L) <br /> 6.1.1 VES Radius of Influence <br /> As described above a ma naheli <br /> g c gauge was used to monitor the vacuum on the <br /> 1 observation wells OB-4 and OB-5 The results are included in Summary Table 3 The <br /> information was then used to calculate the effective radius of influence of the vapor <br /> extraction system A log-normal scatter plot was generated that compares the natural log <br /> 1 of the distance from the extraction well (VES-1) with the average of the measured <br /> vacuum The result is shown on Cross-Plot 2 Projecting the trend established by the two <br /> observations wells to the point where 1 inch of vacuum would be encountered, the radius <br />' of influence would be about 42 feet This compares with the value of 55 feet derived <br /> from the pilot'study of 2000 <br /> I <br /> 1 <br />' 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />