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Raymond Farmer -3- April 28 , 2008 <br /> Claim No , 11910 <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 Dec 05 <br /> • MASS REMOVED : 38 , 964 pounds of TPH-G <br /> C . Groundwater Remediation : <br /> • METHOD : air sparging <br /> • DURATION : Dec 02 through Dec 05 <br /> D . Groundwater Trends : <br /> • Benzene trends are shown below: <br /> Claim 11910 <br /> 3500 <br /> 3000 -- <br /> c 2500 <br /> 2000 ----- �— PAN 1 <br /> 1500 <br /> N <br /> 1000 NNV 7 <br /> m <br /> 500 <br /> M V V N <br /> O 0 a I� <br /> O O O O O O <br /> O O O O O <br /> N N N N N N N N <br /> M M M <br /> Time <br /> VII . SENSITIVE RECEPTOR SURVEY: no wells identified within ''Y2 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 /> Zd Recyc/edPnper , <br />