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Stephen L. Valentine .February 8, 2011 <br /> Claim No..417 <br /> V. FREE PRODUCT:_ none identified <br /> VI. SOIL AND GROUNDWATER:REMEDIATION <br /> A. Soil Excavation: unknown.volume . <br /> B. In-Situ Soil/ Groundwater Remediation: <br /> • METHOD 1: dual phase extraction <br /> • DURATION: Apr 07 through Jun 09 <br /> • MASS REMOVED VAPOR PHASE: 625 gallons of TPH-G <br /> • REVISED RESIDUAL MASS ESTIMATE: 2901 gallons in soil, 23 gallons in <br /> groundwater (2010) , <br /> METHOD 2;-soil-vapor-ex#taction,-and-a r:sparging-proposed-(March-2.010)- - - <br /> C. Groundwater Trends: Benzene trends are shown below, source area and down <br /> gradient, respectively. - <br /> BENZENE Results for M\IV 3 <br /> fi <br /> - <br /> _,._ r. .•.� 12000 <br /> 6 0 <br /> ..... -y 000,- <br /> 2000 <br /> 00 2000'— -' -- <br /> .. <br /> M1 <br /> BENZENE <br /> BENZENE Results;for MV1/ 8 <br /> ^ - <br /> d 50 <br /> 30. <br /> t I <br /> i <br /> mn.Msw:PENZENE . <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION. <br /> A. Site Description: retail gasoline station <br /> B. Site History: the extent of groundwater contamination is defined <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />