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as gasoline (TPH-G), benzene, toluene, ethylbenzene, and xylenes (collectively iknown 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 AS/VE System The influent TPH-G concentration in air was used to calculate the estimated mass removed from the vadose-zone beneath the site during December based on the volume of air removed The Monthly Mass Extraction Calculations are presented as Table Two It shows that based on an average extraction flow rate of 65 cfm, and assuming a constant TPH-G concentration of 450 ug/l in the influent air stream, the system recovered 0 42 gallons of gasoline per day from the vadose-zone The system operated 31 days in the month, and thus 13 02 gallons of gasoline were extracted from the vadose-zone during the month To date, the ASNE remediation system has recovered and remediated 524 39 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 December 2002, ASE measured the product thickness in monitoring well MW-6 and piezometer P-4 using a balier There was n o measurable thickness of product in either well SUSPENSION OF ON-SITE REMEDIAL ACTIVITIES On January 1, 2003, the vapor-extraction/air-sparging remediation system was turned off by ASE personnel Within the recent quarterly groundwater monitoring reports and the monthly O & M reports, the site has experienced a significant downward trend in t h e hydrocarbon and oxygenates' concentrations MTBE and free-floating product no longer exist in any of the wells located on site Operation of the remediation system is no longer economically sensible Given the current budgetary constraints, the budget only allows for continued on-site • groundwater monitoring and off-site management of the domestic wells Frank's One Stop Remediation System Monthly Report — December 2002 -3-