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• Influent Water Sammi <br /> On August 8, 2001, ASE collected an influent water sample (INF 08-08-01 ) <br /> This sample was analyzed by Kiff Analytical of Davis, California (FLAP <br /> #2236) for a full scan EPA Method 8260B and for TPH as diesel by EPA <br /> Method 8015 The analytical results for this sample are tabulated in t h e <br /> Tables Section of this report as Table One The influent water sample <br /> analytical report and chain of custody record is attached in Appendix B <br /> A graph showing the historical TPH-G concentrations in the influent water <br /> samples is attached in the Graph Section of this report <br /> Monthly Fuel _Rp_ oyery Calrulatznn,c <br /> The influent TPH-G concentration was used to calculate the estimated <br /> mass removed from the site during the month based on total gallons <br /> treated The Monthly Performance Log is presented as Table Two in t h e <br /> Tables Section of this report It shows that based on the number o f <br /> gallons extracted in the month of August 2001, which was 196,764 <br /> gallons, and assuming a constant TPH-G concentration of 100,000 parts <br /> per billion in the influent water stream, the system recovered 26 70 <br /> gallons of gasoline from the groundwater beneath the site To date, it i s <br /> estimated that Ill 89 gallons of gasoline have been removed from t h e <br /> subsurface <br /> D-O-WNGRADIENT MONITORING WELLS <br /> c• <br /> Monitoring wells MW-13, MW-14, MW-15, MW-16, and MW-19 are <br /> sampled every 4 to 6 weeks to track the hydrocarbon concentrations of <br /> the groundwater downgradient of the recovery wells These wells are <br /> located across West Yosemite Avenue approximately 90 feet downgradient <br /> of the recovery wells, and are the closest observation points to determine <br /> if the plume leaving the site is being remediated Since the start-up of the <br /> interim groundwater remediation system, hydrocarbon concentrations <br /> within these monitoring wells have generally dropped one to two orders <br /> of magnitude Since the discovery of free-floating hydrocarbons, only <br /> monitoring well MW-13 has shown a slight increase in hydrocarbon <br /> concentrations <br /> FREE-FLOATING PRODUCT IDENTIFIC"ATIO <br /> During field activities on June 14, 2001, ASE identified free-floating <br /> hydrocarbons on the groundwater surface in monitoring wells MW-5 and <br /> MW-6 and piezometer P-4 The product was subsequently identified as <br /> aged gasoline Since its discovery, product has been identified in the NEIP <br /> system tank floating on the water surface ASE has been removing this <br /> Frank's One Stop Remediation System Monthly Report — August 2001 <br /> -3- <br />