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(alkalinity) probably comprises a higher ratio of anions for ground water than for seep water. <br />Table 5 presents ratios of the constituent concentrations in seep water compared to ground water. <br />As indicated, ratios at each well are similar for TDS and hardness. However, ratios are higher <br />for sulfate, indicating that there is relatively more sulfate in seep water than ground water. <br />Trace Metals and Cyanide <br />Table 1 contains the ranges of concentrations for trace metals and cyanide in ground water and <br />seep water. Typically, cadmium, copper, iron, manganese and total cyanide are below detection <br />or near detection limits for ground water at wells GWM -1 and GWM -2. Concentrations of <br />copper, iron, manganese, and molybdenum are much higher for seep water than for ground water <br />at wells GWM -1 and GWM -2. Concentrations of cadmium, lead, zinc, and total cyanide are <br />similar for seep water and for ground water at wells GWM -1 and GWM -2. <br />For the reported pH ranges, manganese and zinc are expected to behave conservatively in ground <br />water; that is, changes in manganese and zinc concentrations should reflect dilution rather than <br />chemical processes. However, as shown in Table 1, zinc concentrations are similar for seep water <br />and ground water but manganese is more than two orders of magnitude more concentrated in seep <br />water compared to ground water at wells GWM -1 and GWM -2. <br />If there was a direct connection between seep water and ground water, the conservative species <br />such as sulfate, manganese and zinc would behave in a similar manner. The similarity of zinc <br />concentrations in seep water and ground water would indicate little or no dilution. However, <br />sulfate concentrations indicate dilutions of up to 39 times (Table 5), and manganese <br />concentrations indicate much larger dilutions of 100 times or more. These differences indicate <br />different sources of water and limited interaction, if any. <br />Trends in Ground Water Parameters <br />Tables 2, 3 and 4 contain a listing of ground water data for wells GWM -1 and GWM -2. Visual <br />examination of data in the tables can be used to indicate trends in water quality parameters. Data <br />for GWM -1 indicate parameters are very similar and have changed very little since initiation of <br />sampling, except for a slight decrease in zinc. For GWM -2, parameters have changed very little <br />over time with the exception of slight increases in TDS and hardness. <br />wellcomp.doc 1/31/96 <br />2 <br />