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' k" KLEINFELDER 5.3.2 Ground Water Characteristics Groundwater were samples analyzed for the following constituents: P Y g ■ volatile halogenated compounds by.EPA Method 601 volatile aromatic compounds by EPA Method 602 ■ metals by ICAP and AA (EPA Method 6010) major anions (sulfate, chloride, bicarbonate, carbonate, and nitrate) pH, total dissolved solids (TDS) electrical conductivity (EC) 5.3.2.1 Organic Compounds Ground water samples were analyzed for volatile organic compounds in June 1989 and January 1990. Traces of chloroform (0.5 and 0.6 ug/1) were reported in MW-2 and the trip blank, respectively, and a trace of toluene (0.7 ug/1) was reported in MW-3 during June 1989. The detection limits for these two compounds were 0.5 and 0.7 ug/1 respectively. No volatile organic compounds were reported in January 1990. It is Kleinfelder's opinion that the presence of chloroform and toluene was caused by either field or laboratory contamination. 5.3.2.2 Metals Ground water samples were analyzed for 20 metals (see Table 5-7) in June 1989 and January 1990. Of these 20 metals, eight were not detected at concentrations above the laboratory reporting limits: aluminum, beryllium, cadmium, cobalt, molybdenum, nickel, silver, and _ thallium. A ninth metal, antimony, was only reported one time (June 1989) in one well (MW- 1), the background well, at a concentration equal to the reporting limit of 0.05 mg/1. Of the remaining 11 metals detected in ground water at the site, only two were reported at concentrations equal to or slightly exceeding established primary maximum contaminant levels (MCLS). These two metals are hexavalent chromium and selenium, and both metals were detected in MW-1 (the background well) at concentrations near or slightly exceeding primary MCLS on one or both dates. CR14-92-12 Page 17 of 39 24-220109-1709 Copyright 1992 Kteinfelder, Inc.