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Approximate Depth to Groundwater 43 30 to 47 60 feet below too of well casco . Groundwater Flow Direction South-southeast Groundwater Gradient 0 004 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 40 milligrams per cubic meter m Im3 Influent Benzene Concentration End of Period a0 15 mglm3 Flow Rate End of Period 77 HC Destroyed this Period (lab) 40 83 lbs as TPHG Cumulative HC Destroyed 4,114 12 lbs as TPHG Percent Time Operational 939 DISCUSSION At the time of the first quarter 2005 monitoring event, groundwater elevations had increased between 1 06 and 1 81 feet in wells MW-1 through MW-4, and MW-6 through MW-10 since the previous monitoring event (October 4, 2004) Depth-to-water measurements were normalized to mean sea level (MSL), and were used to construct a groundwater elevation contour map (Figure 2) Well S-1 was dry The . groundwater flow direction on January 12, 2005, was generally to the south-southeast at an average gradient of 0 004 ft/ft. South-southeast groundwater flow direction has consistently been observed during previous monitoring events MTBE (0 85 pg/L) was reported in well MW-8 TPHG, BTEX, TBA, DIPS, ETRE, 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 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 Remedial activities at the site were initiated with a SVE system consisting of a 150 cfm Stealth Bobcat catalytic oxidizer (cat-ox) and was operated at the site between August 15, 2000 and August 15, 2002, under permit N-903-2-0 Due to low influent concentrations, the cat-ox system was replaced with a SVE system consisting of a 2 3 HP Fuji Blower and two 1,000 lbs vapor phase carbon units, which operated at the site between August 1, 2003 and March 12, 2004, under permit N-4887-1-0 The vapor phase carbon adsorption system was replaced with the currently operating Solleco 100 cfm electric cat-ox in October K%USA Gasoime10065IQtr1y12005%USA_65_1 Q05 DOC 577�ftiTUS