Laserfiche WebLink
S E C 0 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 Groundwater batch extraction was performed on offsite extraction wells EW-2, EW-3, <br /> EW4, and EW-5 on a weekly basis through February 23, 2005 The extracted water was treated <br /> ' through the on-site GWE system Eight batch extraction events were conducted during the first quarter <br /> 2005,which resulted in the removal of 9,250 gallons from the offLxtraction wells <br /> Conclusion <br /> Operation and maintenance of the DPE system will continue during the second quarter 2005 Weekly <br /> batch extraction events will no longer performed on wells EW-2, EW-3, EWA and EW-5 as the <br /> ' installation of the offsite ozone sparge system will been completed during the second quarter 2005 <br /> Attachments Table A-1 — Dual Phase Extraction System—Soil Vapor Extraction Performance Data <br /> Table A-2—Dual Phase Extraction System—Soil Vapor Emission Data <br /> ' Table A-3—Dual Phase Extraction System—Groundwater Extraction Performance <br /> Data <br /> Table A-4—Dual Phase Extraction System —Groundwater Treatment Effluent Data t <br /> ' Figure A-1 — Dual Phase Extraction System —Soil Vapor Mass Removal Trend <br /> Figure A-2— Dual Phase Extraction System —Soil Vapor Hydrocarbon Concentrations <br /> Figure A-3— Dual Phase Extraction System —Groundwater Mass 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 Sheets, <br /> Remediation System Certified Laboratory Analytical Reports, and Chain- <br /> of-Custody Documentation <br /> 3 <br /> 1 <br />