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Thrifty Oil -3- March 3, 2011 <br /> Claim No. 2156 <br /> B. In-Situ Soil/ Groundwater Remediation: <br /> • METHOD 1: dual phase extraction with air sparging <br /> • DURATION: Apr 01 through May 09 <br /> • VOLUME OF GROUNDWATER REMOVED: 582,804 gallons (Mar 09) <br /> • MASS OF TPH-G REMOVED: 210,156 pounds (Mar 09) <br /> • METHOD 2: ozone sparging test, Oct 09 <br /> D. Groundwater Trends: Benzene trends are shown below, source area and down <br /> gradient, respectively. <br /> BENZENE Results for MW-11R <br /> 30000 -- _... . _ ........ _.. . <br /> i <br /> 25000- <br /> 20000 <br /> 5000 20000 ---- — ---- ---- ------ ------ <br /> 0 <br /> .±15000--.._-- --- - .._--- ----- <br /> m <br /> m <br /> 10000--_ I - -- -5000-- <br /> o4 - <br /> 000 0 --- -- - -..- .-.._...., <br /> 4'e 40e <br /> ��.. BENZENE 1 <br /> BENZENE Results for MW-3 <br /> 7000-1 <br /> 60001 1-_ ------ <br /> 5000 <br /> _.-5000 <br /> � 40001---._ <br /> 3000 <br /> 20001 <br /> 1000 <br /> 0 __1--k-1__.--'L.-J. ", <br /> a....r.. BENZENE <br /> VII. 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 /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: dual phase extraction and air sparging <br /> California Environmental Protection Agency <br /> 0.fl <br /> Recycled Paper <br />