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Ranch Market • • <br /> Claim No. 15211 3 May 5, 2009 <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: none identified <br /> • METHOD: soil vapor extraction <br /> • DURATION: Sep 02 through present <br /> • MTBE REMOVAL RATE (Jun 07): 0.002 pounds/day <br /> • TOTAL MASS OF MTBE REMOVED: 9.24 pounds <br /> C. Groundwater Remediation: <br /> • METHOD: ozone sparging <br /> • DURATION: Mar 05 through Apr 05 <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> BENZENE Results for MW-7 <br /> 1600- <br /> 1400}-- I. ._ r 21 <br /> 23 <br /> 1200 -- <br /> ;; 25_ �_.— I f �25 <br /> i <br /> 800 I_....__ ':_._- I. -.27 .°`' <br /> 600t29 <br /> 0 <br /> 400 31 <br /> 200 I ` <br /> 0 133 <br /> �, ,.._ _ 35 <br /> aav� oe <br /> _—_-+-- BENZENE Depth to Water <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within '/ mile of the site <br /> VIII. 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: soil vapor extraction and ozone sparging <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> California Environmental Protection Agency <br /> 01 Recycled Paper <br />