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-Stefano's Gasoline .3- May 7, 2008 <br /> Claim No. 11515 <br /> I <br /> C. Groundwater Remediation: <br /> • METHOD: ozone sparging <br /> • DURATION: Jan 06 through Aug 06,- <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> Claim 11515 <br /> 3500 <br /> 3000 <br /> 2500 <br /> m 2000 <br /> N 1500 -- MW-2 <br /> 1000 <br /> CD <br /> m 500 <br /> O O O O .O O O 9 <br /> U U CD U <br /> Time <br /> r <br /> Vll. SENSITIVE RECEPTOR SURVEY: five 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 /> i <br /> D. Remediation Summary: .soil vapor extraction and ozone sparging <br /> E. Contaminant Exposure Pathway Evaluation: unknown . <br /> F. Recommendation: The San Joaquin-County LOPIhas directed the Responsible <br /> Party to expand the ozone sparging system: The Fund concurs with the <br /> expansion of the groundwater treatment system.. The Fund will review this site <br /> next year'to track progress. <br /> Kirk Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> { <br /> _ s <br /> California Eliv ron wenta/Protection Agency <br /> P.a Recycled Paper , <br />