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MONTHLY FUEL RECOVERY CALCULATIONS <br /> Mass Removed by AVVE Sy.yte <br /> The influent TPH-G concentration in air was used to calculate the estimated <br /> mass removed from the vadose-zone beneath the site during the month based <br /> on the volume of air removed The Monthly Mass Extraction Calculations are <br /> presented as Table Two It shows that based on an average extraction flow <br /> rate of 76 cfm, and assuming a constant TPH-G concentration of 3,100 ug/l i n <br /> the influent air stream, the system recovered 3 38 gallons of gasoline per day <br /> from the vadose-zone The system operated all 31 days in the month, and thus <br /> 104 78 gallons of gasoline were extracted from the vadose-zone during the <br /> month To date, the AS/VE remediation system has recovered and remediated <br /> 290 70 gallons of gasoline at the site A graph showing the influent air <br /> concentration of TPH-G over time is presented in the graphs section of this <br /> report <br /> Rennrt Errors and Correctrnn.c <br /> Within the ASE May and June 2002 Remediation Effectiveness reports, an error <br /> • was made by ASE in respect to the units on the Kiff Analytical air sample <br /> results The error was not noticed until the analytical results for the July 2002 <br /> air bag sample were received The last 3 analytical reports from Kiff (May, <br /> June and July 2002) have reported the influent concentrations of analytes in <br /> parts per million by volume (ppmv) ASE has always requested that the Kiff <br /> reports show concentrations in micrograms per liter (ug/L) The data within <br /> ASE's May and June 2002 reports assumed the concentrations of analytes were <br /> in ug/L when in fact they were reported as ppmv When converting, it was <br /> realized that the influent concentration of analytes was off by an order of 3 -4 <br /> times <br /> ASE caught the error before preparation of this report, and requested Kiff <br /> report the July air sample in ug/L. ASE has also within this report <br /> • changed Table One to reflect the corrected May and June 2002 analytical <br /> results, <br /> • changed the graph to reflect correct influent concentrations of TPH-G <br /> for May and June 2002, <br /> • adjusted the Total Gallons Extracted To Date value on Table Two to <br /> reflect the corrected mass destruction calculations for May and June <br /> Frank's One Stop Remediation System Monthly Report — July 2002 <br /> - 3- <br />