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f Ms Margaret Lagono S E C ® R October 18, 2005 Page 5 Based upon data collected during ongoing quarterly groundwater monitoring and sampling, dissolved hydrocarbons are effectively delineated both laterally and vertically in the vicinity of the site CHARACTERIZATION STATUS Contamination in soil and groundwater has been adequately delineated REMEDIAL PERFORMANCE SUMMARY An ozone sparge system has operated at the site since August 15, 2002 The operation of the ozone injection system and monthly groundwater sampling activities are summarized below Ozone Sparge System Operation The ozone sparge system consists of panel mounted KVA C-SpargeTm panel that produces up to 4 grams of ozone per hour (0 009 pounds per hour) The system injects to 10 sparge points SP-1 through SP-10 Between June 22, 2005 and September 28, 2005, the system ran for 30 hours, resulting in 0 3 pounds of ozone injected and 2 percent runtime System data is presented in Table 1 On July 13, 2005 the system was down due to a tripped 16 amp breaker Because this has been a continuous problem since November of 2004, a 15 amp time delay fuse was provided by Kerfoot Technologies, the manufacturer of the KVA ozone panel, and installed by SECOR On July 27, 2005, the system was found to be down again, this time due to a tripped ozone . sensor Compression fittings inside the panel were tightened, the program controller was reprogrammed and the system restarted On August 19, 2005, the system was down again due a tripped ozone sensor A leak outside the panel at the fitting for SP-10 was discovered and repaired After the system was restarted, a leak in the tubing from the compressor to the manifold was detected The system was left off until new corrugated tubing could be obtained and installed The new tubing was scheduled to be installed on September 19, 2005, but when the technician attempted to install the tubing it was discovered that the manufacturer had changed the diameter of the tubing Since the tubing was too big, the system had to be left off until different parts could be obtained New tubing and larger compression fittings were installed on September 28, 2005 and system was restarted Monthly Groundwater Sampling The performance of the ozone injection system is evaluated by groundwater sampling Monthly groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3 on July 13, August 19, and September 19, 2005, and analyzed for TPHg, BTEX compounds, and MTBE Results of monthly groundwater sampling events are summarized in Table 2 Concentration versus time graphs for dissolved TPHg, benzene, and MtBE in monitoring wells MW-1, MW-2, and MW-3 are provided in Figures 2, 3, and 4, respectively REMEDIATION SYSTEM CRITICAL EVALUATION Evaluation of dissolved concentrations through the third quarter 2005, according to monthly grab samples, indicates that TPHg is below laboratory reporting limits in all three wells sampled MW-1, MW-2 and MW-3 MTBE concentrations have decreased to 5886 3Q2005 QSSR doc SECOR International incorporated