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idt <br /> 9 <br /> Raymond Farmer -3- May 5 , 2009 <br /> Claim No . 11910 <br /> V. FREE PRODUCT : none identified <br /> VI . SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation : unknown volume <br /> B . In -Situ Soil Remediation : <br /> • METHOD : soil vapor extraction <br /> • DURATION : Dec 02 through present, in Apr 05 system updated , active <br /> • MASS REMOVED : 38 , 964 pounds of TPH-G <br /> • RATE OF TPH-G REMOVAL : 15 . 6 pounds/quarter <br /> C . Groundwater Remediation : <br /> • METHOD : air sparging <br /> • DURATION : Feb 03 through 2008 <br /> D . Groundwater Trends : <br /> • Benzene trends are shown below: <br /> BENZENE Results for MW1 <br /> 12000 - 16 <br /> 10000 - 18 <br /> 20 <br /> T 8000 . <br /> a 22 d <br /> m <br /> -9 c <br /> C7 6000 - _ _ _. _ ._ it __ 24 � <br /> 'm 4000 . _ ,_<- — _ _ _ - 26 <br /> 28 <br /> 2000 - / ' - - _ _. •I - <br /> r 30 <br /> NJ32 <br /> 0 -1 <br /> a <br /> i <br /> -- --- BENZENE Depth to Water <br /> VII . SENSITIVE RECEPTOR SURVEY: no wells identified within 1/2 mile of the site <br /> VIII . COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description : active retail gasoline station <br /> B. Site History : the extent of groundwater contamination is defined <br /> C . Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction and air sparging <br /> E . Contaminant Exposure Pathway Evaluation : unknown <br /> California Environmental Protection Agency <br /> Z<'j Recycled Paper <br />