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Exxon Mobil Corp. -3- March 5, 2009 <br /> Claim No. 5312 <br /> V. FREE PRODUCT: RW-3 contained up to 0.98' of free product (Jan 91). Free <br /> product recovery started in Apr 94. <br /> VI. 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 /> BENZENE Results for UVBMW1 <br /> 14000 <br /> 12000 -- <br /> I <br /> 10000 - — <br /> 7 - - - <br /> 8000 <br /> 6000 <br /> 4000 pp <br /> 2000 I '� <br /> ® BENZENE <br /> VII. SENSITIVE RECEPTOR SURVEY: six wells identified within Y2 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 /> California Environmental Protecdon Agency <br /> 04 Recycled Paper <br />