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i ' the month based on the volume of air removed The Monthly Mass • Extraction Calculations are presented as Table Four It shows that based on an average extraction flow rate of 58 cfm, and assuming a constant TPH-G concentration of 3,500 ug/1 in the influent air stream, the system recovered 292 gallons of gasoline per day from the vadose-zone Since ' the system operated only approximately 113 of the time in the first half of the month, and continuously the second half of the month, ASE calculated ' that the system operated approximately 19 total days to the month, a n d thus 55 48 gallons of gasoline were extracted from the vadose-zone during the month 1 DOWNGRADIENT MONITORING WELLS ' Monitoring wells MW-13, MW-14, MW-15, MW-16, and MW-19 are used 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 1 s ' being remedlated Since the start-up of the interim groundwater remediation system, hydrocarbon concentrations within these monitoring wells have generally dropped one to two orders of magnitude FREE-FLOATING PRODUCT STATUS During field activities on June 14, 2001, ASE identified free-floating ' hydrocarbons on the groundwater surface in monitoring wells MW-5 and MW-6 and piezometer P-4 The product was subsequently identified as aged gasoline Since its discovery, product has occasionally been found in I the NEEP system tank floating on the water surface ASE has b e e n removing this product from the NEEP tank and storing it on-site in a drum for future off-site disposal There no longer exists a discernible volume of ' product on any of the wells on or off site 1 I 1 Frank's One Stop Remediation System's Monthly Report — January 2002 ' -5-