Laserfiche WebLink
Site Background Information <br /> Chapin Brothers Investments, Inc <br /> Page 12 of 12 <br /> effective remedial system was required <br /> In accordance with EHDICVRWQCB directives and approval,AGE conducted three separate ground <br /> water extraction pumping tests in March 2001 Analysis of the groundwater extraction data indicted <br /> that ex-situ ground water treatment was feasible,the radius of influence generated by a pumping rate <br /> of three gallons per minute is interpreted to be adequate to control further off-site migration of <br /> ' contaminants toward the west <br /> Under EHD directives and approval, a ground water pump-and-treat system began continuous <br /> ' operation at the site on 02 April 2002 <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 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 of the mass of dissolved hydrocarbons,or diminished remediation effectiveness,would <br /> be acceptable cleanup goals for the site Presently,at most impacted groundwater monitoring wells, <br /> ' the contaminant concentrations have been reduced to approximately I% benzene and 10% TPH-g <br /> of the pre-remediation levels <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />