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Site Background Information Chapin Brothers Investements, Inc <br /> Page 12 of 12 <br /> Under EHD directives and approval, a ground water pump-and-treat system began continuous <br /> operation at the site on 02 April 2002, the system has operated for approximately 18 months Over <br /> this time pcnod approximately 2 5 million gallons of impacted ground water was treated and <br /> estimated cumulative totals of 5 69 lbs of benzene and 140 lbs of TPH-g were extracted <br />' TPH-g and BTEX concentrations have decreased in the monitoring well samples over the <br /> remediation period The overall reduction of benzene on- and off-site Indicates successful removal <br /> ' of dissolved hydrocarbons and capture of the off-site dissolved hydrocarbons,based on monitoring <br /> trend analysis <br /> The remediation-goals presented to the EHD by letter dated 10 August 2001 proposed that removal <br /> of 80 percent ofthe mass of dissolved hydrocarbons,or diminished remediation effectiveness,would <br /> be acceptable clean up goals for the site Presently,at most impacted ground water monitoring wells, <br /> the contaminant concentrations have been reduced to approximately 1 3%benzene and 7 5%TPH-g <br /> of the pre-remediation levels <br /> ' Advanced GeoEnvironmental,Inc <br />