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Mary Sanchez -4- February 25, 2010 <br /> Claim No. 1026 ' <br /> hydraulic control of the groundwater plume. However, it may be prudent to <br /> assess and initiate an additional groundwater treatment technology such as air <br /> sparging and vapor recovery to achieve Water Quality Objectives in a timely <br /> manner. The Fund will review this site next year to track progress. <br /> UPDATED, March 2009: This site has been under investigation or cleanup for <br /> nearly 20 years. The Fund continue to recommend that the San Joaquin County <br /> LOP direct the Responsible Party to more aggressively remediate this site to <br /> achieve Water Quality Objectives more rapidly. The Fund will review this site <br /> next year to track progress. <br /> UPDATED, March 2010: This site has been under investigation for 21 years. <br /> Based on the following criteria, the Fund recommends this site be considered for <br /> closure. <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 /> • 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 /> 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 /> 2/zr/2v/6 <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 /> Caldbrnla En vJronmental Protection Agency <br /> fir}.Recycled Paper <br />