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Central CA Traction Co. -3- April 15, 2010 <br /> Claim No. 16496 <br /> C. Groundwater Monitoring Summary: brief monitoring history <br /> D. Remediation Summary: excavation only . <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In March 2008, the Fund,made the following recommendation: The San Joaquin <br /> County LOP has approved.a.Feb 2008 work plan to define.the extent of. <br /> contamination and the Fund.concurs with the need for additional site <br /> investigation. The Fund recommends the Responsible Party conduct regular <br /> groundwater monitoring and upload existing data to GeoTracker. The Fund will <br /> review this site next year to track progress. <br /> UPDATED, March 2009: The Fund concurs with the San Joaquin County LOP <br /> that this site should be monitored for one hydrologic cycle to determine the <br /> nature and extent of groundwater contamination. The Fund will review this site <br /> next year to track progress. <br /> UPDATED, April 2010: Based on the following criteria, the Fund recommends <br /> this site be considered for closure. <br /> • The source of the UST release has been identified and removed. <br /> • FrewphaBoAxeduct in_grcwndwaterAas been removed to-th -W 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 /> • There are no existing water supply wells, surface waters or other <br /> receptors threatened by the remaining contaminants in soil or <br /> groundwater. <br /> • Pollutants remaining in groundwater do not create or threaten to create <br /> risk to human health and safety, or to future beneficial use(s) of the <br /> groundwater. <br /> • The plume size is stable and sufficiently delineated in lateral and vertical <br /> extent and contaminant concentrations detected in groundwater show a <br /> decreasing trend with time. <br /> • There are no current or anticipated uses of the impacted groundwater <br /> within the timeframe projected to meet water quality objectives. <br /> Cafff©rds Eigr*p=wjW PrW*cdbA Agency <br />