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Frontier Transportation• -4- • May 9, 2008 ik <br /> Claim No. 12886 <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below: <br /> Claim 12886 <br /> 14000 <br /> 12000 =>' <br /> tMW-8 <br /> 10000 M W-20 <br /> 8000 --- <br /> 'U 6000MW-21 <br /> 4000 r� ��MW-22 <br /> 2000 )-MW-23 <br /> 0 <br /> (:�D & QbO 'rP Qbl o`O 01 01 01 01 <br /> 0e< Oed �a�' �Jc 5eQ QeG bac' �O� 5ip Oec; <br /> 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: active retail gasoline station N b' <br /> B. Site History: the extent of groundwater contamination is poorly defined west of <br /> the site <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: The Fund recommends that the San Joaquin County LOP <br /> direct the Responsible Party to assess remedial groundwater technologies and <br /> implement groundwater remediation to achieve Water Quality Objectives in a <br /> timely manner. The Fund will review this site next year to track progress. �i <br /> LwQ - 51Y/a.3 1 GtS <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 /> California EliviranmerrlalPratectian Agency <br /> �.,a Recy'c%dPnpe� <br />