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Ranch Market -3- May 12, 2008 <br /> Claim No. 15211 <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 /> Claim 15211 <br /> 3000 <br /> 2500 ---.. _ . . . <br /> rn 2000 -- -----— — <br /> 1500 <br /> y 1000 - - <br /> m <br /> 500 <br /> 0 L w <br /> Oma' 00 Oma' Oa Ob Oa 00 O� 00 06 06 06 O� <br /> O e� Q�' �O O�eQ�" Oc eOeo <br /> P P P P P P P P P <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within '/2 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 /> C1*Recycled Paper <br />