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V j <br /> h <br /> I07 July 2003 <br /> AGE-NC Project No 95-0142 <br /> , <br />' Page 3 of 7 <br /> • On 04 November 1998, ground water monitoring well MW-6 was Installed at the former <br /> UST location The extent of Impacted ground water had not been fully assessed when the <br /> CAP was developed <br /> • On 10, 11 and 12 January 2000 ground water monitoring wells MW-7 and MW-8 were <br /> Installed 100 feet east and 125 northeast of the former UST location The extent of Impacted <br /> ground water had not been fully assessed when the CAP was developed <br /> • AGE work plan for ground water extraction feasibility dated 15 November 2000 EHD <br /> approval letter of work plan dated 08 December 2000 <br /> • On 20 June 2001 and on 06 July 2001, ground water extraction wells EW-1 and EW-2, <br /> respectively, were Installed at the site <br /> IOn 18 October 2001 AGE conducted a ground water extraction test <br /> • 31 January 2002- Ground Water Extraction Pilot Test Report Analysis of the ground water <br /> extraction data Indicted that ex-situ ground water treatment was feasible, the radius of <br /> Influence generated by a pumping rate of five gallons per minute was Interpreted to be <br /> adequate to control further off-site migration of contaminants toward the east, In the <br /> I . predominantly down-gradient direction <br /> On 23 April 2002 - Final Remediation Plan AGE recommended the use of ground water <br /> extraction as an alternative ground water remediation technique at the site, along with soil <br /> vapor extraction <br /> • EHD letter of FRP denial and cost analysis request dated 26 July 2002 <br /> 10 31 August 2002 - Ground Water Extraction Clean Up Analysis The limited areal <br /> distribution of high concentrations of dissolved hydrocarbons near the source of the release <br />' favors an aggressive approach for removing the dissolved hydrocarbon on-site AGE <br /> recommended ground water extraction system In the source area and along the historical <br /> down-gradient portion of significantly Impacted ground water should effectively address the <br /> plume of Impacted ground water <br /> 1 , <br /> • EHD approval letter of FRP technoloy date 28 May 2003 <br /> Site assessment activities to date Indicate that <br />' 0 The highest concentration of hydrocarbon-Impacted ground water has remained below <br /> former UST TK1-90 The maximum benzene concentration was 41,000 micrograms per liter <br /> (µg/1), detected in a water sample from vapor extraction well VW-1, located at the former <br /> UST area <br /> • 0 TPH-g and BTEX concentrations have steadily declined In the ground water samples <br />' Advanced GeoE nvi ron mental,Inc <br /> 1 <br />