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Ms Margaret Lagorio S E C ® R <br /> October 18, 2005 <br /> Page 6 <br /> . below laboratory reporting limits in MW-1, but continue to be present in MW-2 and MW-3 <br /> at concentrations 7 9 tag/I or lower Concentrations of TPHg and MTBE that have <br /> fluctuated within historical levels over the short term, and in the long term, have <br /> generally declined over time The dissolved plume remains defined by the existing <br /> monitoring well network <br /> RECENT SUBMITTALSMORRESPONDENCE <br /> Submitted <br /> Quarterly Status and Remediation Summary Report — Second Quarter 2005, <br /> dated August 1, 2005 <br /> WASTE DISPOSAL <br /> The disposal of purged groundwater generated during the quarterly groundwater <br /> monitoring event is documented in TRC's Quarterly Monitonng Report, July through <br /> September 2005, dated September 7, 2005 (Attachment 1) <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results from the third quarter 2005 sampling, the existing ozone sparge <br /> well network appears to be successfully remediating hydrocarbons dissolved in the <br /> groundwater at the site Concentrations of TPI-Ig and BTEX in groundwater continue to <br /> • be near or less than the laboratory reporting limits in wells MW-1, MW-2 and MW-3 <br /> MTBE concentrations in groundwater at MW-2 and MW-3 increased slightly this quarter, <br /> but MtBE concentrations in groundwater at MW-1 continue to decrease SECOR will <br /> continue to operate and evaluate the effectiveness of the ozone sparge system during <br /> the fourth quarter 2005 <br /> THIS QUARTER ACTIVITIES (Third Quarter 2005) <br /> 1 TRC performed quarterly groundwater monitoring and sampling <br /> 2 SECOR prepared and submitted quarterly summary report <br /> 3 SECOR performed remedial system O&M <br /> NEXT QUARTER ACTIVITIES (Fourth Quarter 2005) <br /> 1 TRC to perform groundwater monitoring and sampling <br /> 2 SECOR to prepare and submit quarterly summary and monitoring report <br /> 3 SECOR to perform remedial system O&M <br /> LIMITATIONS <br /> This report presents our understanding of existing conditions at the subject site The <br /> • conclusions contained herein are based on the analytical results, and professional <br /> 5886 3Q2005 QSSR doe SECOR Intematronal Incorporated <br />