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Chapin Brothers Inc. -3- February 25, 2010 <br /> Claim No. 557 <br /> B. In-Situ Soil Remediation: none identified <br /> • METHOD: soil vapor extraction <br /> • DURATION: Apr 97 through Jun 99 <br /> C. Groundwater Remediation: <br /> • METHOD 1: air sparging <br /> • DURATION: Apr 97 through Jun 99 <br /> • METHOD 2- groundwater extraction <br /> • DURATION: Apr 02 through May 05, Aug 09 through present <br /> • VOLUME OF GROUNDWATER EXTRACTED: 2.6 million gallons <br /> • METHOD 3: dual phase extraction pilot test <br /> • DURATION: May 08 <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below, down gradient of source area. <br /> Claim 557 <br /> 7000 - <br /> 6000 - -- — -- <br /> 5000 <br /> rn <br /> 4000 - <br /> c <br /> N 3000 <br /> c <br /> a <br /> 00 <br /> 2000 <br /> 1000 <br /> 0 -, <br /> 00 OHO OlO OHO OHO O� O� O� O� (:)(bO� O� <br /> OGS ,�� PQM �; OGS 1J",,ac PQM/ OGS; �a PQ �J' OGS <br /> time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within '/2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station <br /> B. Site History: the extent of groundwater contamination is defined <br /> California Environmenta/Protection Agency <br /> ;,a Recycled Paper <br />