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John Pestana QTIP Tru -4- February 22, 2010 <br /> Claim 3484 <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 /> • 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 /> In summary, the remaining mass of hydrocarbons in soil and groundwater is <br /> minor, the extent of contamination is defined, the groundwater plume is shrinking, <br /> and Water Quality Objectives will be achieved in a few years. <br /> UPDATED, March 2009: -The Fund continues to recommend that the <br /> San Joaquin County LOP consider this site for closure. Further investigation at <br /> this site is unlikely to benefit the people of California. <br /> UPDATED, March 2010: -By letter on 20 October 2009, the San Joaquin County <br /> LOP concurred with no further action for this site. The Fund supports this <br /> decision and recommends this site be closed with delay. <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 Environmental Protection Agency <br /> �.a RecydedP per <br />