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<br />I1. Watrr Quality Impacts <br />Table 12 <br />Comparison of 1980 Projections of Water Quality <br />in the Middle Fork of the Purgatoire below the New Elk Mine with <br />1994 Revised Estimates <br /> <br /> <br />1980 WWL Anticipated <br />Water Quality Impacts Projected Worst Case <br />Water Quality <br />Upstream' Downstream= Change PARAMETER' Change Downstream' Upstream' <br />l66 174 8 TDS' 39 205 166 <br />105 107 2 Alkalinity ND ND ND <br />0.019 0.020 0.001 Boron ND ND ND <br />1.4 1.43 0.03 Chloride 0.2 1.6 1.4 <br />0.44 0.441 O.OOI Iron 0.01 0.45 0.44 <br />0.03 0.3005 0.0005 Fluoride 0.04 0.04 0.03 <br />9.0 12.4 3.4 Sodium 40.8 49.8 9 <br />38 37.99 -0.Ol Calcium 0 38 38 <br />7.4 7.45 0.05 Magnesium 0.6 8.0 7.4 <br />119 12l 2 Bicarbonate t47 136 ll9 <br />0.02 0.0205 0.0005 Zinc 0 0.02 0.02 <br />0.35 0.48 0.13 SAR' 1.70 1.9 0.22 <br />' mean values collected at the USGS station at Stonewall, 07124050. <br />: impact projected at low flow <br />~ mgR <br />' Total Dissolved Solids (TDS) <br />' Sodium Adsorption Ratio <br />35 <br />