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Groundwater Flow Direction North-northeast Groundwater Gradient 0 0020 ft/ft INTERIM REMEDIATION SYSTEM OPERATION AND PERFORMANCE Equipment Inventory Ozone Injection System (Manufactured by_KVA®) Operating Mode Operational Reporting Period January 13,2005 through March 31, 2005 Historical Highest GRO Concentration 55,000 /L MW-6, 2002 Historical Highest Benzene Concentration 18,000 /L MW-8, 2001 Historical Highest MTBE Concentration 85,000 /L MW-6, 2002 Highest GRO Concentration this Period 27,000 IL MW-8 Highest Benzene Concentration this Period 600 /L MW-8 Highest MTBE Concentration this Period _ 23,000 pg/L(MW-8) Number of System Shutdowns This Period 0 DISCUSSION At the time of the first quarter 2005 monitoring event, groundwater elevations had increased between 0 90 and 1 22 feet in all wells since the previous sampling event (December 9, 2004) Depth-to-water • measurements were corrected to mean sea level (MSL) and used to construct a groundwater elevation contour map (Figure 3) Wells MW-9 and MW-10 are screened in a deeper portion of the water-bearing zone and were not used in contouring The groundwater flow direction was generally to the north-northeast at an average gradient of 0 0020 ft/ft Radial and northeast groundwater flow has been observed at this site during previous quarters REMEDIATION SYSTEM STATUS System Description The C-SpargeTM system, manufactured by KVe, consists of a control panel (ozone generator, air compressor, and tubing manifold), and strategically located injection points (IW-1 through IW-5, see Figure 2) used to inject low concentrations of ozone into groundwater In addition, the control panel also has a programmable timer that limits the amount of ozone injected into each injection point The system injects a timed pulse of ozone at low flows and low pressures (10-30 psi) to each of the five injection points in a sequence The ozone dissolved in groundwater is expected to oxidize petroleum hydrocarbons into carbon dioxide and water, and any un-reacted ozone will degrade to dissolved oxygen, which is likely to enhance natural biodegradation of residual petroleum hydrocarbons System Operation Details The C-Sparge m system was started on December 26, 2002 The C-SpargeTM control panel was programmed and scheduled to inject ozone cyclically into each injection point for 14 minutes Based on this programming, each injection point will have ozone injection in 18 cycles for 4 2 hours every day �z During the first quarter 2005 (between January 13, 2005 and March 31, 2005), a Stratus technician conducted seven site visits to collect field and laboratory parameters, and to conduct operation and maintenance of the ozone injection system Field data sheets presenting field parameters collected K Tp-Arco for URS\5469\Quarter1y\2005\Arco_5469_1Q05 doe 5779arU5