ARCHIVED REPORTS XR0002743 - Laserfiche WebLink

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• Groundwater Batch Extraction Batch groundwater extraction was initiated in March 2002 and consisted of extracting groundwater from on-site wells MW-1, MW-4, MW-6, and EW-1 with a vacuum truck Batch extraction was performed twice a month until the construction of the permanent remedial system was initiated in November 2002 Batch extraction was re-started in September 2003 as an interim remedial approach to reduce petroleum hydrocarbon concentrations in off-site extraction wells, and for controlling further off-site migration of the dissolved plume pending connection of offsite extraction wells to the on-site SVE/GWE system Offsite extraction wells EW-2, EW-3, EWA EW-5, and EW-7 are pumped on a weekly basis, and the water is treated through the on-site GWE system Fourteen batch extraction events were conducted during the fourth quarter 2003, which resulted in the removal of 24,570 gallons from the off-site extraction wells Batch extraction removal data is presented in Table A-5 Conclusion Operation and maintenance of the SVE/GWE system will continue during the first quarter 2004 Due to difficulties associated with connecting off-site wells EW-2, EW-3, EW-4, EW-5, and EW-7 to the operating SVE/GWE system, SECOR is exploring other remedial options for addressing off-site petroleum hydrocarbon impacts Further explanation of the encountered difficulties and a proposal including discussion of alternative remedial options will be presented in a revised interim remedial action plan (IRAP) that will be submitted during the first quarter 2004 Batch extraction events will continue to be performed on a weekly basis to remove residual petroleum hydrocarbons beneath and in the vicinity of the site, and for plume migration control until an alternative remedial approach is approved and subsequently implemented Attachments Table A-1 - Soil Vapor Extraction System Performance Data Table A-2 - Soil Vapor Extraction System —Soil Vapor Emission Data . Table A-3 Groundwater Extraction System Performance Data Table A-4 Groundwater Extraction System —Groundwater Treatment Effluent Data Table A-5 Batch Extraction Removal Data Figure A-1 - Soil Vapor Extraction System —Soil Vapor Mass Removal Trend Figure A-2 - Sod Vapor Extraction System —Soil Vapor Hydrocarbon Concentrations Figure A-3 - Groundwater Extraction System —Groundwater Mass Removal Trend Figure A-4 - Groundwater Extraction System—Groundwater Hydrocarbon Concentrations Attachment A-A- Batch Extraction and Remediation System Field Data Sheets, Remediation System Certified Laboratory Analytical Reports, and Chain-of-Custody Documentation