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Thiemann Service Station -3- '� March 24, 2009 <br /> Claim No. 1978 <br /> C. Groundwater Trends: <br /> • Benzene and xylenes trends are shown below <br /> Pesuits:for,MVV2 a "'` <br /> 5000_ ---------- n s <br /> 4500 ;fs .� �-- .21 <br /> 4000 <br /> 23 <br /> r 3500 <br /> ,C -3000 r'c I , 25 d <br /> 2000I OF , <br /> 29 <br /> 1500 — - — — <br /> s I , <br /> 1000 ,.N __L 1 .33 <br /> .. '31 <br /> 500 — <br /> O <br /> r — --- — <br /> ' wed'XYLENES .ai_BENZENEDepth to Water J - <br /> VII. SENSITIVE RECEPTOR SURVEY: nine wells identified within '/2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, service station <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: none identified <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In.April 2008,, the Fund made the following recommendation: Based on the <br /> following criteria, the Fund recommends this site be considered for closure <br /> providing the potential for soil vapor migration is assessed and determined safe <br /> for prescribed site activities, public participation and fee title notifications are <br /> conducted, and the monitoring wells are appropriately abandoned. <br /> • The source of the UST release has been identified and removed. <br /> • Free-phase product in groundwater has been removed to the full extent <br /> practicable, in accordance with the UST Regulations (Title 23, CCR, <br /> Section 2655). <br /> • Contaminants remaining in the vadose zone cannot migrate in soil vapor <br /> or leach at concentrations that would cause groundwater to exceed water <br /> quality objectives. <br /> California Environmental Protection Agency <br /> - ro <br /> %4 Recycled Paper - <br />