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MONTHLY FUEL RECOVERY CALCULATIONS <br /> Mass Removed by AS/VE System <br /> The influent TPH-G concentration in air was used to calculate the <br /> estimated mass removed from the vadose-zone beneath the site during <br /> the month based on the volume of air removed The Monthly Mass <br /> Extraction Calculations are presented as Table Two It shows that based <br /> on an average extraction flow rate of 68 cfm, and assuming a constant <br /> TPH-G concentration of 180 ugll in the influent air stream, the system <br /> recovered 0 18 gallons of gasoline per day from the vadose-zone The <br /> system operated all 31 days in the month, and thus 5 58 gallons of <br /> gasoline were extracted from the vadose-zone during the month To date, <br /> the AS/VE remediation system has recovered and remediated 143 15 <br /> 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 <br /> this report <br /> Should you have any questions regarding this report, or require any <br /> additional information, please feel free to call me at (925) 820-9391 <br /> Respectfully submitted, <br /> AQUA SCIENCE ENGINEERS, INC. <br /> avid Allen <br /> Senior Project Engineer <br /> Attachments <br /> cc Mr Frank Guinta, Property Owner <br /> Mr Don Thompson <br /> Mr Marty Hartzell, RWQCB <br /> Mr Mark Owens, UST Cleanup Fund <br /> Mr Jim Podesta, City of Manteca <br /> Frank's One Stop Remediation System Monthly Report — May 2002 <br /> -3- <br />