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• 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 effectiveness of the system in relation to the decline <br /> of TPH as gasoline concentrations in the influent water samples is <br /> attached in the Graph Section of this report <br /> Monthl)2 Fuel Recovery CaLcuLaLLaas <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 the <br /> Tables Section of this report It shows that based on the number o f <br /> gallons extracted in the month of May 2001, which was 182,010 gallons, <br /> and assuming a constant TPH-G concentration of 1,800 parts per billion in <br /> the influent water stream, the system recovered 044 gallons of gasoline <br /> from the groundwater beneath the site To date, it is estimated that 31 08 <br /> gallons of gasoline have been removed from the subsurface <br /> DOWNGRADIENT MONITORING WELLS <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 Yosemite Avenue approximately 90 feet downgradrent of <br /> the recovery wells, and are the closest observation points to determine if <br /> the plume leaving the site is being remediated Since the start-up of t h e <br /> interim groundwater remediation system, hydrocarbon concentrations <br /> within these monitoring wells have generally dropped one to two orders <br /> of magnitude <br /> Frank's One Stop Remediation System Monthly Report — May 2001 <br /> -3- <br />