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Ms Margaret Lagono S E C O R w <br /> April 28, 2005 <br /> Page 4 <br /> tripping 16 AMP circuit breaker The problem is being investigated and it is believed that <br /> the compressor pulls higher AMPS when the system restarts between cycles The <br /> compressor will be rebuilt next quarter <br /> Monthly Groundwater Sampling <br /> The performance of the ozone infection system is evaluated by groundwater sampling <br /> Monthly groundwater samples were collected from monitoring wells MW-1, MW-2, and <br /> MW-3 on January 25, February 25, and March 22, 2005, and analyzed for TPHg, BTEX <br /> compounds, and MTBE Results of monthly groundwater sampling events are <br /> summarized in Table 2 Concentration versus time graphs for dissolved TPHg, benzene, <br /> and MtBE in monitoring wells MW-1, MW-2, and MW-3 are provided in Figures 2, 3, and <br /> 4, respectively <br /> REMEDIATION SYSTEM CRITICAL EVALUATION <br /> Evaluation of dissolved concentrations through the first quarter 2005, according to <br /> monthly grab samples, indicates that TPHg is below laboratory reporting limits in all <br /> three wells sampled MW-1, MW-2 and MW-3 MTBE continues to be present in all <br /> three wells The highest concentration of MTBE detected was 310 g/L in well MW-1 <br /> Concentrations of TPHg and MTBE that have fluctuated within historical levels over the <br /> short term, and in the long term, have generally declined over time The dissolved <br /> plume remains defined by the existing monitoring well network <br /> . CHARACTERIZATION STATUS <br /> Contamination in soil and groundwater has been adequately delineated <br /> CONCULSIONS AND RECOMMENDATIONS <br /> Based on the results of the first quarter 2005, the existing ozone sparge well network <br /> appears to be successfully remediating hydrocarbons dissolved in the groundwater at <br /> the site Although the system has had a low run time this quarter, concentrations of <br /> TPHg and BTEX have continued to be near to or less than the laboratory reporting limits <br /> in wells MW-1, MW-2 and MW-3 MTBE concentrations in MW-2 and MW-3 were at or <br /> below 6 4 pg/L MTBE concentrations in MW-1 have risen to 310 pg/L this quarter <br /> SECOR will continue to operate and evaluate the effectiveness of the ozone sparge <br /> system during the second quarter 2005 <br /> RECENT SUBMITTALS/CORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (First Quarter 2005) <br /> 1 Performed quarterly groundwater monitoring and sampling (TRC) <br /> 2 Prepared and submitted a quarterly summary report <br /> 3 Performed remedial system O&M <br />