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Thrifty Oil April 21 , 2008 <br /> Claim No. 2156 <br /> B. In-Situ Soil/ Groundwater Remediation: none identified <br /> • METHOD: dual phase extract;cn <br /> • DURATION: Apr 01 through present <br /> • VOLUME OF GROUNDWATER REMOVED: 582,804 gallons <br /> • MASS OF HYDROCARBONS REMOVED: 191,127 pounds of TPH-G <br /> • RATE OF REMOVAL: 3.73 pounds,'day <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> Claim 2156 <br /> 35000 <br /> 30000 <br /> 25000 - - <br /> rn <br /> ' 20000 - <br /> °' t MW-11 <br /> N 15000 <br /> c <br /> m 10000 <br /> 5000 <br /> 0 <br /> 0 0 0 0 0 0 0 0 0 0 <br /> ?. > T > T > >. > >. > <br /> M O M O t0 O M O (9 O <br /> 2 Z 2 Z � Z 2 Z 2 Z <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: 10 wells identified within '/z 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: dual phase extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> California Environmental Protection Agency <br /> Cio <br /> 3 Recycled Paper <br />