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S E C 0 R <br /> r z� <br /> Groundwater Batch Extraction 1 <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 /> EWA and EW-5 on a weekly basis through February 23, 2005 The extracted water was treated <br /> ' through the on-site GWE system a'i <br /> Offsite Ozone Sparge <br /> Offsite ozone sparge wells OS-1 through OS-6 were installed during the first quarter 2005 and an ozone <br /> sparge system was installed during the second quarter 2005 and connected to these wells System F^ <br /> b <br /> start-up was completed on July 12, 2005 Ozone sytem operational data will be reported in future kr" <br /> px <br /> ' quarterly reports <br /> Conclusion <br /> ' Operation and maintenance of the DPE system will continue during the third quarter 2005 The <br /> offsite ozone sparge system completed during the second quarter 2005 will be started during the third <br /> 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 M <br /> Table A-3— Dual Phase Extraction System —Groundwater Extraction Performance <br /> Data ;9A <br /> ` <br /> Table A-4— Dual Phase Extraction System —Groundwater Treatment Effluent Data , <br /> Figure A-1 —Dual Phase Extraction System — Sod Vapor Mass Removal Trend <br /> Figure A-2— Dual Phase Extraction System _Sod 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 r <br /> Attachment A-A— Remediation System Field Data Sheets, Remediation System <br /> Certified Laboratory Analytical Reports, and Cham-of-Custody ,. <br /> ' Documentation <br /> s <br /> v� <br /> 3� <br /> V��v <br /> 4� <br /> h <br /> R <br /> 3� <br /> 1 <br /> 1S�n�W <br /> G2 <br /> �3 <br /> � r <br /> rm� <br />