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r Toste Farms -3- May 23, 2008 <br /> Claim No. 14558 <br /> C. Groundwater Remediation: <br /> METHOD: ozone sparging <br /> • DURATION: Jun 04 through present? <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below <br /> Claim 14558 <br /> 50000 <br /> 40000 <br /> 30000 --�—MW-7 <br /> m M W-5, <br /> 20000 —w-- I <br /> ►- .:.MW-4 <br /> 10000 <br /> M M d N LOU") (0 <br /> 0 0 o a o o ..o 9 0 0 <br /> C m <br /> r Time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within Y2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION'FOR RECOMMENDED ACTION <br /> A. Site Description: 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: ozone sparging, unknown duration <br /> E. Contaminant Exposure,Pathway Evaluation: unknown j <br /> F. Recommendation: The Fund 'recommend. <br /> ecommends that the San-Joaquin County LOP <br /> direct the Responsible Party assess the effectiveness of the current groundwater <br /> treatment system and maximize the system as necessary to achieve Water <br /> Quality Objectives in a timely manner. The Fund will review this site next year to <br /> track progress. <br /> -K k 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 /> wfornia Environmenta]Protection Agency <br /> c g r <br /> P.d Recycled Paper <br /> x <br />