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<br />Dove FIa7i Pmjert <br />per Qaoi7Q water Qaali7r <br />The water quality analyses for both surface and ground water were generally consistent with the <br />analyses from the first second and third quarters. Elevated concentrations of acetone and <br />benzene were detected in three samples at concentrations above the EPA practical quantitation <br />limit (PQL). Elevated concentrations of the same parameters were found in the laboratory blank <br />indicating contamination from the laboratory. When the high sample concentrations are adjusted <br />Cor laboratory contamination the resultant organic parameters are below the EPA PQL. <br />Inorganic analyses, including metals, revealed no constituents at levels above background. Major <br />ions and other parameters are at concentrations that are considered normal. No results exceed <br />the Colorado primary drinking water standards. <br />Major ion balance calculations were made to determine the completeness of the groundwater <br />analyses. Results of the ion balance calculations are presented in Table 3. Groundwater samples <br />are electrically neutral, so the total charges on cations and anions reported in the analyses should <br />be equal. The total positive and negative charges are obtained by summing the equivalent <br />concentrations of cations and anions.. The ion balance error is normally expressed by the <br />difference as a percentage of the sum and should be less than about 7.5 percent error (Lloyd and <br />Heathcote 1985).1 Ion balance for the fourth quarter analyses at Dowe Flats are not all within <br />• [he acceptable error range. Errors exceeding 7.5 percent were obtained for samples DFMW-1, <br />DFMW-3 and DFSW-3. <br />The following is a brief discussion of the analytical results for the samples collected from each <br />monitoring location. The units of ug/L are equivalent to parts per billion (ppb); mg/L are <br />equivalent to parts per million (ppm). <br />5.1 Monitorine Well DFMW-1 <br />Benzene, acetone, and toluene were detected below the EPA PQL in the groundwater sample from <br />this well. These detections are attributed to lab contamination and are not considered to <br />representative of the sample. The inorganic analyses are consistent with the results from the first <br />three quarters. <br />1 Lloyd, J.W., and Heathcote, J.A., 1985, Natural inorganic hydrochemistry in <br />relation to groundwater an introduction: Clarendon Press, Oxford, 296 pp. <br />P~gjeet Nmba: 769-9)-072 <br />Apd ta, 1991 <br />Pace 5 <br />