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WEISS ASSOCIATE'S <br /> M64 <br /> y <br /> SUMMARY <br /> Weiss Associates(WA)drilled one angle boring and installed one monitoring well adjacent <br /> to each of two propylene glycol storage vaults(Vaults 1 and 6) and one chill water storage vault <br /> (Vault 8) at the Diamond Walnut Growers processing plant in Stockton, California Soil <br /> ' samples collected from the borings near Vaults 1 and 6 were analyzed for propylene glycol and <br /> ethylene glycol Samples from the borings near Vault 8 were analyzed for chromium, sodium, <br /> calcium and chloride Propylene and ethylene glycol were detected in the samples beneath <br /> Vaults I and 6 None of the Vault 8 soil samples contained total chromium, total hexavalent <br /> chromium or soluble total chromium above California Department of Health Services (DHS) <br /> Total Threshold Limit Concentrations (TTLC) or Soluble Threshold Limit Concentrations <br /> (STLC) <br /> 1 <br /> Ethylene glycol and propylene glycol were not detected in water samples from monitoring <br /> wells MW-1 and MW-2 Ground water samples from MW-3, adjacent to Vault 8 contained <br /> soluble hexavalent chromium at low concentrations <br /> i <br /> i <br /> i <br /> i <br /> i <br />' D lALL1331DWG1331R1MA1 WP Page v <br />