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• Water from eight sampling sites on tributaries in the mine plan area was sampled and analyzed <br />for major chemical constituents and trace elements for baseline conditions. Table 4.8-11 gives a <br />cross-reference for historical sampling sites S-1 through S-14 against current NPDES site <br />locations. Tables 2.7-15 through 2.7-18 present analyses of major chemical constituents found in <br />tributaries on the Trapper Mine area. Tables 2.7-15 through 2.7-18 give the results from the initial <br />three samples of the pre -operational monitoring. Figures 2.7-16 through 2.7-18 show the ranges <br />of constituents for three sets of analyses. <br />Surface water on the mine site is the same chemical type as that in the Yampa and Williams Fork <br />Rivers. Dominant cations include calcium, sodium, and magnesium, while dominant anions are <br />bicarbonate and sulfate with some chloride present. Concentrations are generally higher than <br />those in the Yampa and Williams Fork Rivers. This is expected from lower attitude intermittent <br />(and ephemeral) drainages. TDS values are generally an order of magnitude higher than those <br />of the major rivers. <br />Figures 2.7-16 and 2.7-18 also show the national primary and secondary drinking water <br />standards and the limits for continuously used irrigation water. TDS exceeds the secondary <br />drinking water knits of 500 mg/I in most samples; the sulfate limit of 250 mgA is exceeded at sites <br />• <br />8-1, S-2 and SS; the iron limit of .3 mgA is exceeded at sites S-1, S-2, S-3 and S-5; and the <br />manganese font of .05 rrgll is exceeded at stations S-1 and S-2. Irrigation standards are <br />exceeded for ion (sites S-2, S-3 and S-5), sodium absorption rate (site S-3), manganese (site S- <br />2), lithium (site S-2), and molybdenum (sites S-1 and S-2). <br />• 2-418 <br />