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S E C O R <br /> Groundwater Batch-Extraction - <br /> Batch groundwater extraction was initiated in March 2002 and consisted of extracting groundwater from <br /> on-site wells MW-1, MW-4, MW-6, and EW-1 with a vacuum truck Batch extraction was performed <br /> twice a month until the construction of the permanent remedial system was initiated in November 2002 <br /> Batch extraction was re-started in September 2003 as an interim remedial approach to reduce petroleum <br /> hydrocarbon concentrations in off-site extraction wells, and for controlling further off-site migration of the <br /> dissolved plume plume With the exception of the August 4, 2004 groundwater batch extraction event <br /> during which groundwater extraction was performed solely on wells EW-4 and EW-5, groundwater batch <br /> extraction was performed on offsite extraction wells EW-2, EW-3, EW-4, and EW-5 on a weekly basis <br /> The extracted water is treated through the on-site GWE system Twelve batch extraction events were <br /> conducted during the third quarter 2004, which resulted in the removal of 11,650 gallons from the off-site <br /> extraction wells <br /> Conclusion <br /> Operation and maintenance of the SVE/GWE system will continue during the fourth quarter 2004 <br /> Weekly batch extraction events will continue to be performed on wells EW-2, EW-3, EW-4, and EW-5 <br /> until the installation of the offsite ozone sparge system as proposed in the revised interim remedial <br /> action plan (IRAP) is completed <br /> Attachments Table A-1 - Dual Phase Extraction System -Soil Vapor Extraction <br /> Performance Data <br /> Table A-2 - Dual Phase Extraction System - Soil Vapor Emission Data <br /> Table A-3 - Dual Phase Extraction System --Groundwater Extraction <br /> Performance Data <br /> Table A-4 - Dual Phase Extraction System -Groundwater Treatment <br /> Effluent Data <br /> - <br /> Figure A-1 Dual Phase Extraction System -Soil Vapor Mass Removal <br /> Trend <br /> Figure A-2 - Dual Phase Extraction System -Soil Vapor Hydrocarbon <br /> Concentrations <br /> Figure A-3 - Dual Phase Extraction System -Groundwater Mass <br /> Removal Trend <br /> Figure A-4 - Dual Phase Extraction System -Groundwater Hydrocarbon <br /> Concentrations <br /> Attachment A-A Batch Extraction and Remediation System Field Data <br /> Sheets, Remediation System Certified Laboratory Analytical <br /> Reports, and Chain-of-Custody Documentation <br />