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Exxon Mobil Corp. "' -3- June 24, 2008 <br /> Claim No. 5312 - <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: <br /> • METHOD: soil vapor extraction <br /> • DURATION: Apr 94 though 1996 <br /> C. Groundwater Remediation: <br /> • METHOD: groundwater extraction <br /> • DURATION: Feb 97 through unknown <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> Claim 5312 <br /> 14000 -- <br /> 12000 - <br /> 10000 <br /> 40001200010000 - <br /> 5000 wB-M W-1 <br /> s000 <br /> 4000 v-z <br /> 0° 2000 <br /> 0 <br /> 0 0 0 0 0 0 0 0 0 0 <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: six wells identified within '/z mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, vacant lot <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 and groundwater extraction, free product <br /> recovery <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> California Eavironmenta/Protection Agency <br /> 2d RecyctedPaper <br />