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7 <br /> Yamada Bros Inc. -4- May 7, 2009 <br /> ' Claim No. 17042 <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, ortofuture 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 /> In summary, the remaining mass of hydrocarbons in soil and groundwater is 1 . <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 /> 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 /> X v <br /> a <br /> 1 <br /> I <br /> California Environmental Protection Agency <br /> P.a Recycled Paper <br />