SITE INFORMATION AND CORRESPONDENCE FILE 1

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- Teichert and Son -4- April 9, 2008 Claim No. 51 • The source of the -UST release has been identified and removed. • Free-phase product in groundwater has been removed to the full extent practicable, in accordance with the UST Regulations (Title 23, CCR, Section 2655). • Contaminants remaining in the vadose zone cannot migrate in soil vapor or leach at concentrations that would cause groundwater to exceed water quality objectives. • There are no existing water supply wells, surface waters or other receptors threatened by the remaining contaminants in soil or groundwater. • Pollutants remaining in groundwater do not create or threaten to create risk to human health and safety, or to future beneficial use(s) of the groundwater. • The plume size is stable and sufficiently delineated in lateral and vertical extent and contaminant concentrations detected in groundwater show a decreasing trend with time. In summary, the remaining mass of hydrocarbons in soil and groundwater is minor, the extent of contamination is defined, the groundwater plume is shrinking, and Water Quality Objectives will be achieved in a few years. AMENDED 41912008: The Fund received correspondence from San Joaquin County LOP staff stating they believe additional plume definition should be conducted. The Fund concurs with the additional plume delineation to support the request for closure consideration. It is our recommendation that additional plume definition downgradient of MW-17 be implemented immediately and that regular monitoring be conducted over the next hydrologic cycle. Based on the additional plume delineation and subsequent groundwater sampling, the Fund requests that San Joaquin County consider this site for closure, if appropriate. The Fund will review this case in six months. KA"Larson,arson, P.G. Date Robert Trommer, C.H.G. Date Technical Review Unit Chief, Technical Review Unit (916) 341-5663 (916) 341-5684 Califon wia En virawm ewlalProdectiow.4gewcy P.a RecycledPppet