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F ♦ INFLUENT AIR SAMPLE COLLECTION AND ANALYSES Influent Air Sampl On October 24, 2002, ASE collected an influent air sample (INF-VE-10 24 02) from the manifold of the 5 VE wells The sample was analyzed by Kiff Analytical of Davis, California (FLAP #2236) for total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, and xylenes (collectively known as BTEX), the seven fuel oxygenates and lead scavengers by EPA Method 8260B The analytical results for this sample are tabulated in Table One The influent air sample analytical report and chain of custody record is attached in Appendix A MONTHLY FUEL RECOVERY CALCULATIONS Mass Removed , by ASIVF..,, System The influent TPH-G concentration in air was used to calculate the estimated • mass removed from the vadose-zone beneath the site during October based on the volume of air removed The Monthly Mass Extraction Calculations a r e presented as Table Two It shows that based on an average extraction flow rate of 72 cfm, and assuming a constant TPH-G concentration of 2,500 ug/l in the influent air stream, the system recovered 2 58 gallons of gasoline per day from the vadose-zone The system operated 31 days in the month, and thus 79 98 gallons of gasoline were extracted from the vadose-zone during the month To date, the AS/VE remediation system has recovered and remediated 507 85 gallons of gasoline at the site A graph showing the influent air concentration of TPH-G over time is presented in the graphs section of this report FREE-FLOATING PRODUCT IDENTIFICATION During the month of October 2002, ASE measured and bailed the product thickness in monitoring well MW-6 and piezometer P-4 three times On 10/3/02, the thickness was measured to be 1/2" in MW-6 and 1" in P-4 On 10/10/02, the thickness in both wells measured approximately 1/8" On 10/31/02, there was no measurable thickness of product in either well • Frank's One Stop Remediation System Monthly Report -- OLtober 2002 -3-