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Bank of Stockton -3- March 3, 2011 <br /> Claim No. 1878 <br /> B. In-Situ Soil/ Groundwater Remediation: <br /> • METHOD: soil vapor extraction and air sparging, pulsing <br /> • DURATION: Feb 05 through present - <br /> • MASS OF TPH-G REMOVED: 3,110 pounds (Apr 2010) <br /> • RATE OF TPH-G REMOVAL: less than 2#/day' ,z <br /> C. Groundwater Trends: Benzene trends are shown below, source area and down <br /> gradient, respectively. - <br /> BENZENE Results for MVV 7 s 2 <br /> i > <br /> "ls000 <br /> 16000 <br /> t <br /> 12000 <br /> 10000 -- <br /> 8000 <br /> 4000 � <br /> . 1- � <br /> .. <br /> 1 _ <br /> BENZENE - •" <br /> i <br /> BENZENE Results for MV11, 8B <br /> 25000 I <br /> � 1 j <br /> 20000 -. — —— "- <br /> 15000 <br /> t <br /> 3' 10000 T — <br /> ai <br /> 5000 <br /> 1 <br /> • 4 I. p <br /> � 1 <br /> x <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description, fueling facility for wood.products manufacturer <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> 0 00 <br /> D. Remediation Summary: soil vapor extraction and air sparging, pulsing has <br /> been proposed <br /> E. Contaminant Exposure Pathway Evaluation: passed Tier I risk screening. <br /> California Environmental Protection Agency <br /> Co Recyc%d Paper <br />