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' Best California Gas -3- May 2, 2011 <br /> Claim No. 13729 <br /> B. In-Situ Soil Remediation: I ;I <br /> dr I <br /> • METHOD: soil vapor extraction <br /> DURATION: Jun 99 through Dec 2010 <br /> MASS REMOVED: 168,719 pounds of TPH-G (De'c 2010) <br /> • RATE OF REMOVAL: 0.38 pounds/hr (Dec 2010) :1 <br /> C. Groundwater Remediation: � ( <br /> • METHOD: groundwater extraction <br /> • DURATION: Jan 09 through Jul 09 <br /> • VOLUME OF GROUNDWATER EXTRACTION: 47,042 gallons <br /> D. Groundwater Trends: MTBE trends are shown,�below, source area. <br /> .. �� <br /> METHYL-TERT-BUTYL ETHER (MTBE} Results for MW-5 <br /> r lip <br /> 45000- <br /> 40000- <br /> 35000 <br /> 5000 40000 35000...... -- ----._•:___._ N—____ <br /> f 30000I_._ <br /> L <br /> I <br /> I ~�- –�� �, ----_. ...iii <br /> N 20000 _-_ �-- �'�—�, <br /> 15000- <br /> 10000 <br /> 5000 10000 <br />` 5000 L-1 <br /> 0 _ ,,..-...- __. <br /> ra METHYL-TERT-BUTYL ETHER(MTBE) 7rand <br /> .} F <br /> METHYL-TERT-BUTYL ETHER (MTBE) Results for EW-5S <br /> i . <br /> 6000- <br /> 5000 <br /> 000 5000 <br /> f 4000 <br /> 3000 . ....... �.... .._. _ I — <br /> 2000 <br /> ,r. METHYL-TERT-BUTYL ETHER(MTSE) R* ++ Trend <br /> E. Water Quality Objectives: consultant for Responsible Party estimates that <br /> water quality objectives will be achieved within 10 years. <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> California En vironmental Protection Agency <br /> Z,*Recycled Paper <br />