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FP Recovered This Quarter NA Cumulative FP Recovered to Date NA Approximate Depth to Groundwater _46 42 to 48 89 feet below top of well casing Groundwater Flow Direction South-southeast Groundwater Gradient 0 003 ft/ft SVE SYSTEM QUARTERLY OPERATION AND PERFORMANCE Equipment Inventory Solleco 100 cfm electric catalytic oxidizer Operating Mode Catalytic APCD Permit No N-4887-2-0 Influent TPHG Concentration End of Period 56 Influent Benzene Concentration End of Period <0 15 Flow Rate End of Period 82 HC Destroyed this Period (lab) 569 33 lbs Cumulative HC Destroyed 4,073 29 lbs Percent Time Operational 9950 DISCUSSION At the time of the fourth quarter 2004 monitoring event, groundwater elevations had decreased between 0 21 and 0 43 feet in wells MW-1 through MW-4, and MW-6 through MW-8 since the previous monitoring event (July 21, 2004) Depth-to-water measurements were normalized to mean sea level (MSL), and were used to construct a groundwater elevation contour map (Figure 2) Wells S-1 and S-2 were dry Less than 1 foot of water was measured in wells MW-9 and MW-10, and these wells bailed dry during purging These wells are interpreted to be dry The groundwater flow direction on October 4, 2004, was generally to the south-southeast at a gradient of 0 003 fVft South-southeast groundwater flow direction has consistently been observed during previous monitoring events TPHG (690 µg/L) was reported in well MW-3 Benzene, MTBE, TBA, DIPS, ETBE, TAME, methanol, or ethanol were not reported in any of the wells Analytical results are generally consistent with historical analytical data TPHG, benzene, and MTBE data have been summarized on Figure 3 Groundwater concentrations have decreased significantly since initiation of remediation activities System Description Soil Vapor Extraction and Abatement SVE System The SVE system consists of a Solleco 100 cfm electric catalytic oxidizer (Model 100 ECAT) with a 5 horsepower (hp) blower Upon system start-up (October 20, 2004), petroleum hydrocarbon laden soil vapors were extracted from wells S-1, S-2, and MW-8 using the 5 HP blower package of the SVE system rated at 100 cfm at 14 inches of mercury Figure 2 presents the locations of the vapor extraction wells, remediation system, and other pertinent site features The extracted soil vapors were abated in the catalytic oxidizer prior to discharge to the atmosphere The SVE system has an in-built hour meter and recordings are used to determine the operational uptime Sample ports (influent, cat-influent, and effluent) are designated to collect air samples The results of air samples are used to estimate the destruction efficiency of the system K\USA Gaso]me\0065\Qtrly\2004\USA_65_4Q04 DOC STIZATUS