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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 SV4 <br /> 120000 <br /> i <br /> 100000 <br /> 1 <br /> i I I <br /> i <br /> 80000 --- <br /> ___ <br /> 60000 - 11, <br /> 5L I <br /> � I <br /> € aSI <br /> a _ <br /> 40000 �- <br /> 20000 — <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 Environmental Protecdon Agency <br /> p„a Xecyc%d Paper <br />