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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, MW4, 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 pending connection of offsite extraction wells to the on-site SVE/GWE system <br /> Offsite extraction wells EW-2, EW-3, EW-4, EW-5, and EW-7 are pumped on a weekly basis, and the <br /> water is treated through the on-site GWE system Thirteen batch extraction events were conducted <br /> during the first quarter 2004, which resulted in the removal of 16,700 gallons from the off-site extraction <br /> wells <br /> Conclusion <br /> Operation and maintenance of the SVE/GWE system will continue during the second quarter 2004 <br /> Weekly batch extraction events from wells EW-2, EW-3, EW-4, EW-5, and EW-7 will continue until <br /> the installation of the offsite remedial system proposed in the revised interim remedial action plan <br /> (TRAP) <br /> Attachments Table A-1 - Dual Phase Extraction System —Sod Vapor Extraction <br /> Performance Data <br /> Table A-2 - Dual Phase Extraction System —Sod 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 />