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r4 <br /> INFLUENT AIR SAMPLE COLLECTION AND <br /> ANALYSES <br /> On September 16, 2002, ASE collected an influent air sample (INF-VE-09 16 02) <br /> from the manifold of the 6 VE wells An August air bag sample could not be <br /> collected due to the non-operational status of the IC engine during the latter <br /> part of August The September sample was analyzed by Kiff Analytical of <br /> Davis, California (ELAP #2236) for total petroleum hydrocarbons as gasoline <br /> (TPH-G), benzene, toluene, ethylbenzene, and xylenes (collectively known as <br /> BTEX), the seven fuel oxygenates and lead scavengers by EPA Method 8260B <br /> The analytical results for this sample are tabulated in Table One The influent <br /> air sample analytical report and chain of custody record is attached in <br /> Appendix A <br /> MONTHLY FUEL RECOVERY CALCULATIONS <br /> Mass Removed by A&YF, System <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 August a n d <br /> September based on the volume of air removed The Monthly Mass Extraction <br /> Calculations are presented as Table Two It shows that based on an average <br /> extraction flow rate of 74 cfm, and assuming a constant TPH-G concentration <br /> of 3,000 ug/l in the influent air stream, the system recovered 3 19 gallons of <br /> gasoline per day from the vadose-zone The system operated 43 days in the <br /> two months, and thus 137 17 gallons of gasoline were extracted from the <br /> vadose-zone during the two months To date, the AS/VE remediation system <br /> has recovered and remediated 42787 gallons of gasoline at the site A graph <br /> showing the influent air concentration of TPH-G over time is presented in the <br /> graphs section of this report <br /> FREE-FLOATING PRODUCT IDENTIFICATION <br /> During field activities on September 10, 2002, ASE identified free-floating <br /> hydrocarbons on the groundwater surface in monitoring well MW-6 and <br /> piezometer P-4 ASE became suspicious ever since the influent vapor <br /> concentrations began to reverse their downward trend in June 2002 and <br /> started climbing to near all-time highs The thickness of the product was. <br /> approximately 2 75 inches in each well This product was not identified by ASE <br /> Frank's One Stop Remediation System Monthly Report — August & September 2002 <br /> -3- <br />