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Thrifty Oil '" -3- April 15, 2010 <br /> Claim No. 2156 <br /> B. In-Situ Soil/ Groundwater Remediation: none identified <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: <br /> • Benzene trends are shown below.- <br /> BENZENE <br /> elow:BENZENE Results for MW-11 <br /> 35000 <br /> j <br /> 30000-- --- ---- _. - -}--- --- <br /> 25000 -- - - ------ <br /> 20000 -_ <br /> 15000---- — -.-- - — <br /> 10000--- - <br /> 5000-- I------ <br /> o <br /> a <br /> :a... BENZENE <br /> BENZENE Results for MW-1 1 R <br /> 90008000-- <br /> 7000------- <br /> 6000 <br /> 00o 7000 -----6000 <br /> 5000 ------- - --- - --�_ -_.. - -- - <br /> 4000 — - - — -- -- - -- <br /> a <br /> 3000 - - -- --- --- --- <br /> 2000 -- <br /> 1000 ------ - - - ------' - - <br /> O r - <br /> +�. .. <br /> BENZENE <br /> VII. SENSITIVE RECEPTOR SURVEY: 10 wells identified within 1/2 mile of the site <br /> California Environmental Protection Agency <br /> Zd Recycled Paper <br />