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result from local deep percolation. However, there is less assurance that samples <br />• from 05-01-0004 and 05-01-0005 are truly representative because of the difficulties <br />encountered in attempting to pump The desired volume from these wells in which only <br />a small column of wafer stood. <br />Groundwater encountered in the updi{> wells is characterized by moderate <br />levels of TDS, moderate to low boron, and low sodium adsorption (SAR) and would <br />be suitable for irrigation if it were available in economic quantities. As indicated <br />previously, only very small quantities exist, however. Water of the quality indicated <br />by samples from wells 05-01-0004 and 05-01-0005 would be only marginally <br />satisfactory to unsatisfactory for irrigation and would not be suitable for drinking. <br />Total dissolved solids is The limiting parameter. <br />The major manifestation of groundwater occurrence in the previously mined <br />areas is the numerous springs as shown on Exhibit 2.5-21. Discharge and quality of <br />selected springs were monitored and reported by McWhorter, et ol., (1979). The <br />mean values of several parameters for two 01' the larger springs are given in Table <br />2.5-15. The means were computed from monthly samples collected over a two year <br />period from October 1973 To November 1975. The location of the spring designated <br />as C3 is shown on Exhibit 2.5-2 and is noted c•n Exhibit 2.5-21. The CS spring issues <br />• from beneath spoil material in the central area of the Edna Mine. During August, <br />1980, five springs in the Edna Mine area were sampled as a part of the present study. <br />The water quality data for the five springs are tabulated in Table 2.5-15a. All of <br />these springs issue from beneath the spoils and are located near the toe of the slope <br />from the West Ridge to near the center portion of The Edna Mine. The spring <br />designated TS-E6 on Table 2.5-15a is the spring called C5 in Table 2.5-15. As in the <br />case for the confined groundwater, the quality of The spring water is not suitable for <br />irrigation or drinking. Note that the concentrations of trace elements in these spoil <br />waters are not elevated relative fo Trout Creek. Waters discharged from the springs <br />eventually enters Trout Creek and becomes tremendously diluted. This aspect is <br />discussed further in Section 2.5.3.3 which deals with surface water disturbances. <br />2.5.2.5 Alluvial Valley Floor Investigation <br />• Geomorphology -Trout Creek is a perennial stream that heads in the <br />northern Flat Tops (Routt National Forest) at an elevation above II,000 feet. <br />• Throughout its upper course it is a steep gradient, armored stream. In the study <br />area, Trout Creek approximately follows the strike of bedding in the eastern limb of <br />Revised 7-81 2.5-58 <br />