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' Method 8015 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 Recovery _Calculatio 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 ITables Section of this report It shows that based on the number of gallons extracted in the month of July 2001, which was 213,950 gallons, and assuming a constant TPH-G concentration of 160,000 parts per billion in the influent water stream, the system recovered 4645 gallons of gasoline from the groundwater beneath the site To date, it is estimated that 85 19 gallons of gasoline have been removed from the subsurface DOWNGRADIENT MONITORING WELLS Monitoring wells MW-13, MW-14, MW-15, MW-16, and MW-19 a r e . sampled every 4 to 6 weeks 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 t h e interim groundwater remediation system, hydrocarbon concentrations within these monitoring wells have generally dropped one to two orders of magnitude Since the discovery of free-floating hydrocarbons, only monitoring well MW-13 has shown a slight increase in hydrocarbon concentrations ' FREE-1ELOAlING PRODUCT.,IDENTIFIC'ATIO During field activities on June 14, 2001, ASE identified free-floating I hydrocarbons on the groundwater surface in monitoring wells MW-5 a n d MW-6 and piezometer P-4 The product was subsequently identified as aged gasoline Since its discovery, product has been identified in the NEEP Isystem tank floating on the water surface ASE has been removing this product from the NEEP tank and storing it on-site in a drum for future off- site disposal On a weekly basis, ASE has also been measuring and bailing the product from the wells On August 14, 2001, Clearwater Environmental Management removed water and product from the three Iwells using a vacuum truck Liquids were removed from each well until Frank's One Stop Remediation System Monthly Report — July 2001 - 3-