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Ms Margaret Lagono S E C ® R August 1, 2005 Page 5 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 infects to 10 sparge points SP-1 through SP-10 Between March 22, 2005 and June 22, 2005, the system ran for 61 hours, resulting in 1 0 pounds of ozone infected and 3 percent runtime System data is presented in Table 1 The system often shuts down due to a tripping 16 AMP circuit breaker The problem is being investigated and it is believed that the compressor pulls higher AMPS when the system restarts between cycles The compressor was rebuilt on April 25, 2005, but the breaker continued to trip The manufacturer, Kerfoot Technologies, was contacted and they suggested that time delay fuses should be installed in the systems that have this problem The time delay fuses will be installed during the beginning of the 3`d quarter On May, 11, 2005, tubing running to SP-2 was repaired and put back on-line Sp-10 was also put back on-line after checking for high pressures and leaks Monthly Groundwater Sampling The performance of the ozone infection system is evaluated by groundwater sampling Monthly groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3 on April 25, May 11, and June 22, 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 second 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 below laboratory reporting limits in MW-1, but continue to be present in MW-2 and MW-3 at concentrations 0 56 pgll or lower Concentrations of TPHg and MTBE that have fluctuated within historical levels over the short term, and in the long term, have generally declined over time The dissolved plume remains defined by the existing monitoring well network RECENT SUBMITTALS/CORRESPONDENCE Submitted Quarterly Status and Remediation Summary Report — Second Quarter 2005, dated April 28, 2005 CONCULSIONS AND RECOMMENDATIONS Based on the results of the second quarter 2005, the existing ozone sparge well network appears to be successfully remediating hydrocarbons dissolved in the groundwater at the site Although the system has had a low run time this quarter, concentrations of TPHg and BTEX have continued to be near to or less than the laboratory reporting limits in wells MW-1, MW-2 and MW-3 MTBE concentrations in MW-2 and MW-3 were at or below 19 pg/1 and MtBE concentrations in MW-1 continues to show a declining trend 5886 2Q2005 QSSR SECOR International Incorporated