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Teichert and'Son 4-. -April 9, 20087.,:' a_ <br /> Claim No. 51 <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). ro . <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 supply water su I 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 contaniinant'concentrations detected in groundwater show a <br /> decreasing,trend with,time. <br /> In summary, the remaining mass of hydrocarbons in soil and-groundwater is minor, the <br /> extent of contamination is defined, the groundwater plume is shrinking, and Water <br /> Quality Objectives will be achieved in:a few years. <br /> AMENDED 41912008: The Fund received correspondence from San Joaquin County <br /> LOP staff stating they believe additional plume definition should be conducted. The <br /> Fund concurs with the additional plume delineation to support the request for closure <br /> consideration. It is our recommendation that additional plume definition downgradient of <br /> MW=17 be implemented immediately and that regular monitoring be conducted over the <br /> I� next hydrologic cycle. Based on the additional plume delineation and subsequent <br /> groundwater sampling, the Fund requests that San Joaquin County consider this site for <br /> } closure, if-appropriate.. The Fund.will review this case in six months. <br /> K_ k arson, P.G. Date -Robert Trommer, C.H.G.' Date <br /> Tech nicaI Review Unit. �,. ,, Chief, Technical Review Unit <br /> { (916) 341-5663 (016) 341-5684 <br /> f[ff <br /> Calaforraia�n vrrorsmert�alProtectio�r agency <br /> �.a Recycled Paper <br />