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1 <br /> QUARTERLY SUMMARY REPORT <br /> Second Quarter 2003 <br /> (April -June) <br /> 13ARACTERIZATION/REMEDIAL STATUS: <br /> Impacted soil delineated? Lateral: yes <br /> Vertical: es <br /> Impacted ground water delineated? <br /> Current Phase of Project? _Groundwater Monitoring and <br /> Sampling and Interim Remediation <br /> Frequency of Sampling? Quarterl <br /> Current Remediation Techniques? Ozone Microsparge Interim Remedial <br /> System <br /> Soil remediation in progress? no <br /> -anticipated start? NIA <br /> -anticipated completion? January 1999 <br /> Groundwater Gradient (historical)? Southeast to southwest at an average <br /> gradient of 0.001 ft/ft <br /> Dissolved/free product remediation in progress? Yes — Ozone microsparge system <br /> started in December 2002. <br /> -anticipated start? Groundwater ur 2199 to 2/03 <br /> -anticipated completion? unknown <br /> Amount of impacted groundwater recovered this quarter? 0 (gal) <br /> Amount of impacted groundwater recovered historically? 863,080 (gal) <br /> CONCLUSIONS: <br /> The vertical and lateral extent of soil impact is defined. The dissolved groundwater plume has been defined. The <br /> r �npacted groundwater beneath the site is currently being remediated by an interim ozone microsparge system. <br /> G: <br /> ecause of the operating Ozone Micro sparge Interim Remedial System onsite,ConocoPhillips decided to suspend <br /> weekly groundwater purging events following the February 18,2003 groundwater purging event. The first system <br /> status report for the ozone system concluded that the interim remedial system appears to be effective in reducing <br /> MtBE concentrations in groundwater beneath the site. <br /> RECOMMENDATIONS: <br /> GR recommends the continuation of the quarterly monitoring and sampling program to evaluate the dissolved <br /> hydrocarbon plume. GR also recommends that wells MW-3 and MW-10 continue to be sampled on a monthly basis <br /> to monitor the effectiveness of the interim ozone microsparge system. <br /> CONSULTANT: Gettler-Ryan Inc. <br /> 140193.1 <br /> 2 <br />