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r <br /> Chevron Products May 21, 2008 <br /> Claim No. CP0034 <br /> B. In-Situ Soil Remediation: ' <br /> • METHOD: soil vapor extraction <br /> • DURATION: (Chevron) Sep 97 through Dec 97.. <br /> (ARCO) Oct 93 through. resent <br /> p , <br /> C. Groundwater Remediation: <br /> • METHOD: air sparging <br /> • DURATION: (Chevron) Apr 97 through May 05, <br /> (ARCO) Jan 98 through present , <br /> D. Groundwater Trends: <br /> • MTBE and TBA trends for each site are.shown below <br /> Claim-CP0034 <br /> Chevron:. : . <br /> 400 <br /> 350 *. <br /> 300 <br /> 250 TVY _ t MW-5r <br /> 200 4 <br /> LU <br /> 150 —�—MW-2r <br /> A <br /> 100. -MW79r <br /> 500 <br /> O`5 O`5 (z;tX p�` 'Z' (z O`° .o`° 01 01 <br /> 5Q� <br /> .' . . - Time <br /> :. . : ,: . . . .. . , .: .. ,. Claim CP0034 . . . . . . . . . ... . . . . .. .. <br /> ARCO <br /> 3500 <br /> 3000 - <br /> 2500 - <br /> 2000 <br /> 00025002000 <br /> LU 1500 <br /> 1000 <br /> 500 <br /> 0 . . .. . . . . <br /> Op, off` o� O� OHO • o� 01 p,` <br /> (11 <br /> : 4< �a11' <br /> Time <br /> California En vironmental Protection Agency <br /> Qf Recyc%d Paper , <br />