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R <br /> i <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 /> 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 June 2001, which was 208,960 gallons, <br /> and assuming a constant TPH-G concentration of 2,700 parts per billion in <br /> the influent water stream, the system recovered 7 66 gallons of gasoline <br /> from the groundwater beneath the site To date, it is estimated that 38 74 <br /> gallons of gasoline have been removed from the subsurface <br /> DOWNGRADIENT MONITCI,R,ING 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 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 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 /> FREE-FLOATING PRODUC'T.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 NEEP <br /> system tank floating on the water surface ASE has been removing this <br /> product from the NEEP tank and storing it on-site in a drum for future off- <br /> site disposal On a weekly basis, ASE has also been measuring and bailing <br /> the product from the wells <br /> i <br /> Frank's One Stop Remediation system Monthly Report — June 2001 <br /> -3 - <br />