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1 i <br /> concentrations in the influent water samples is attached in the Graph <br /> • Section of this report <br />' Monthly Fuel Recovery Calculation,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 the <br /> Tables Section of this report It shows that based on the number o f <br /> gallons extracted in the month of December 2001, which was 94,730 <br /> gallons, and assuming a constant TPH-G concentration of 14,000 parts p e r <br />' billion in the influent water stream, the system recovered 1 80 gallons of <br /> gasoline from the groundwater beneath the site To date, it is estimated <br /> that 13064 gallons of gasoline have been removed from the subsurface <br /> DOWNGRADIENT MONITORING WELLSI <br />' Monitoring wells MW-13, MW-14, MW-15, MW-16, and MW-19 are used to <br /> track the hydrocarbon concentrations of the groundwater downgradient <br />' of the recovery wells These wells are located across West Yosemite <br /> Avenue approximately 90 feet downgradient of the recovery wells, and are <br /> the closest observation points to determine if the plume leaving the site is <br /> being remediated Since the start-up of the interim groundwater <br /> remediation system, hydrocarbon concentrations within these monitoring <br /> wells have generally dropped one to two orders of magnitude <br /> FREE-FLOATING PRODUCI IDENTIFICATION <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 occasionally been found in <br /> the NEEP system tank floating on the water surface ASE has been <br />' removing this product from the NEEP tank and storing it on-site in a drum <br /> for future off-site disposal On a per-visit basis, ASE has also been <br /> measuring and bailing the product from the wells Monitoring well MW-5 <br /> no longer has a measurable amount of product Monitoring well MW-6 <br /> and piezometer P-4 contain only a sheen of product <br /> AIR-SPARGING I VAPOR EXTRACTION SYSTEM SICART-UP <br /> On December 21, 2001 ASE turned the air-sparging vapor-extraction <br /> . (ASNE) system on The system was operated for only a few hours before <br /> being shut-off for the remainder of the month due to personnel a n d <br /> Frank's One Stop Remediation System Monthly Report — December 2001 <br /> -3- <br />