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f I Influent Water .S'am On October 26, 2001, ASE collected an influent water sample (INF 10-26- 01) This sample was analyzed by Kiff Analytical of Davis, California (FLAP #2236) for TPH-G, BTEX, and the five fuel oxygenates by EPA Method 8260B The analytical results for this sample are tabulated in the Tables ' Section of this report as Table One The influent water sample analytical report and chain of custody record is attached in Appendix B A graph ' showing the historical TPH-G concentrations in the influent water samples is attached in the Graph Section of this report ' Monthly Fuel Rer-overy Calculations The influent TPH-G concentration was used to calculate the estimated mass removed from the site during the month based on total gallons ' treated The Monthly Performance Log is presented as Table Two in the Tables Section of this report It shows that based on the number of ' gallons extracted in the month of October 2001, which was 116,760 gallons, and assuming a constant TPH-G concentration of 8,000 parts p e r billion in the influent water stream, the system recovered 1 27 gallons of ' gasoline from the groundwater beneath the site To date, it is estimated that 12632 gallons of gasoline have been removed from the subsurface '. DOWNGRADIENT-MONITORING WELL ' Monitoring wells MW-13, MW-14, MW-15, MW-16, and MW-19 are used to track the hydrocarbon concentrations of the groundwater downgradient of the recovery wells These wells are located across West Yosemite ' Avenue approximately 90 feet downgradient of the recovery wells, and are the closest observation points to determine if the plume leaving the site is being remediated Since the start-up of the interim groundwater ' remediation system, hydrocarbon concentrations within these monitoring wells have generally dropped one to two orders of magnitude FREE-FLOATING PRODUCT IDENTIFICAIJON ' During field activities on June 14, 2001, ASE identified free-floating hydrocarbons on the groundwater surface in monitoring wells MW-5 and MW-6 and piezometer P-4 The product was subsequently identified as ' aged gasoline Since its discovery, product has occasionally been found in the NEEP system tank floating on the water surface ASE has been removing this product from the NEEP tank and storing 1t on-site in a drum ' for future off-site disposal On a per-visit basis, ASE has also been • measuring and bailing the product from the wells Monitoring well MW-5 ' no longer has a measurable amount of product Monitoring well MW-6 Frank's One Stop Remediation System Monthly Report — October 2001 ' -3 -