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M Canepa 's Car Wash -3- March 24 , 2009 <br /> Claim No . 8449 <br /> A. Soil Excavation : unknown volume in Apr 00 <br /> B . In -Situ Soil Remediation : <br /> • METHOD : soil vapor extraction <br /> • DURATION : Mar 99 through Apr 2008 <br /> • MASS OF HYDROCARBONS (vapor phase) REMOVED : 11 , 058 pounds of <br /> TPH -G <br /> C . Groundwater Remediation : <br /> • METHOD : groundwater extraction <br /> • DURATION : Nov 04 through Apr 2008 <br /> • VOLUME OF GROUNDWATER EXTRACTED : 3 ,474 , 229 gallons <br /> MASS OF HYDROCARBONS REMOVED : 693 pounds of TPH-G <br /> D . Groundwater Trends : <br /> • Benzene trends are shown below <br /> BENZENE Results for SV-4 <br /> 120000 - -_ - - - -� . .- - --- -- - - ( - <br /> 100000 —� <br /> 80000 . - <br /> 60000 <br /> 40000 <br /> 20000 _ <br /> 0 <br /> 1 <br /> �© BENZENE - Trend <br /> VII . SENSITIVE RECEPTOR SURVEY: no wells identified within '/z mile of the site <br /> VIII . COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description : former retail gasoline station , car wash <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 and groundwater extraction <br /> E . Contaminant Exposure Pathway Evaluation : unknown <br /> California Environmenta/ Protection Agency <br /> ;,a <br /> Recycled Paper <br />