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Report—F,st Phase Remed,al System Page 17 <br /> Fortner Manna Pro Site <br />' Project No 207 3 <br /> • June 18, 2002 <br /> 1 <br /> The following graph shows the radius of influence representation <br /> 1 <br /> Cross-Plot 2 <br /> Radius of Influence- Vapor Extraction <br />' 45 <br /> a 4 y=-2 4526Ln(x)+ 10 355 <br /> 3 35 <br /> `o <br /> 3 <br /> 25 <br /> 1 <br /> 1 5 <br /> i a`s 5 <br /> 05 <br /> l 10 100 <br /> Distance from Extraction Well IFt I <br /> I� <br /> I <br /> 6.1.2 System Performance Calculations <br /> Using the gasoline concentration as calculated weekly by methods described above, the <br /> gasoline concentration in mg/L was multiplied by the average daily vapor extraction rate <br /> for each week Typically, the vapor extraction rate was estimated to be about 175 scfm, <br /> which works out to a total of over 20 million cubic feet over the 95 days In addition to <br /> calculating the daily hydrocarbon extraction rate, a running cumulative was calculated for <br /> total gasoline mass extracted By using this method, we estimated that about 850 pounds <br /> of gasoline were removed over the 95-day course of operation The graph below (Cross- <br /> Plot 3) shows the extraction rates as measured weekly in terms of pounds per day, while <br /> the upper curve is the cumulative running total of extracted gasoline A best-ft <br /> exponential decline line has been applied to the data points, however, a careful <br /> examination of the data points shows a distinct flattening of the decline rate during the <br /> last four to six weeks of the extraction operation Initially, the system extracted about 32 <br /> pounds per day of gasoline but this declined to about 3 5 pounds per day and was <br /> approximately steady during the final few weeks <br /> I2937 Veneman Ave, #B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />