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Mr Frank Yoneshige April 2, 1993 Van Den Bergh Foods, Inc. Job No R92024 02 ' Page 2 ' Summajy of An 1 is 1 R s It Table 1 summarizes the soil boring analytical results. The analytical results indicate TPH-G ' concentrations of "None Detected" (ND) and TPH-D concentrations ranging from ND to 11.0 mg/kg Concentrations of Volatile Halocarbons and Volatile Aromatics were ND. t Analytical results for the groundwater sample collected from MW-4 are summarized in Table 2. The results indicate "None Detected" concentrations of TPH-G, TPH-D, and Volatile Aromatics. Laboratory Data Reports, Chain-of-Custody and Request for Analysis ' documentation are presented in Appendix B. Summajy of Ground Water ' Based on MW-4 data, the groundwater table at the site is currently approximately 74 feet below grade surfaces (bgs . _ e grounte dwar table has nsen approximately six feet since ' tlievzq-us_sampling in October 1992. During the past ten years, groundwater in the vicinity of the site has been 50 feet bgs or hill higher. No data was obtained from monitor we s, MW-1, MW-2, and MW-3, which were installed to a depth of 65 feet. Conclusions ' Based on the findings of this soil assessment and groundwater sampling conducted by BSK and a previous assessment documented in RS' "Soil and Groundwater Investigation" report dated November 10, 1992, RS concludes the following: o The boring logs indicate soil lithology in the unsaturated zone is predominantly silts and clays interspersed with silty sand lenses at a depth of ' about 50 feet bgs in B-1, B-101 through B-104, and at depths of 15 feet bgs and 50 feet bgs in MW-4. ' o TPH-D constituents, which have significantly impacted soil in the vicinity of the former tank emplacement, have not impacted soil beyond approximately ' a 35-foot radius from boring B-1 Figure 1 indicates the estimated extent of contaminated soil. Relatively low TPH-G concentrations detected in the B- 101 through B-104 soil samples likely result from the lighter fractions of diesel ' which may be present in the soil gas, and are probably not the result of a gasoline spill at the site. The data indicate lateral migration extends 20 feet in the northeasterly direction to the MW-4 boring and that lateral migration is limited to within an approximately 35-foot radius of B-1. Data from the four borings B-101 through B-104 indicate that soil contamination does not extend beyond the area studied during this investigation Lateral contaminant migration via sand lenses is not indicated, based on the chemical data for soil samples B-101 through B-104. 1 REMEDIATION SERVICES INC