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Table 1. Comparison of water quality parameters from the Sanborn Creek Mine and the North <br />Fork of the Gunnison River. Ranges are shown where data were available. <br />Parameter <br />Alkalinity as CaCO, <br />Bicarbonate as CaCO_, <br />Conductivity <br />pH <br />TDS <br />SOa <br />C03 <br />CP <br />Na <br />Fe (total) <br />Ca <br />Mg <br />K <br />Sr <br />Cu <br />Pb <br />Mn <br />Zn <br />Mine Effluent North Fork Units <br />1455-1938 42-126 mg/1 <br />1090 42-118 mg/I <br />4150 80-222 µmos/cm <br />8.1-9.2 7.2-8.6 standard <br />2940 32-152 mg/1 <br />134 n/a mg/1 <br />800 8 mg/1 <br />216 n/a mg/1 <br />1005 n/a mg/1 <br />1.22 0.03-1.25 mg/1 <br />13.2 n/a mg/1 <br />7.88 n/a mg/1 <br />5.99 n/a mg/1 <br />2.32 n/a mg/1 <br /><0.005 0.01 max mg/1 <br />< 0.05 0.06 max mg/1 <br />0.04 0.08 max mg/1 <br />0.21 0.02 max mg/1 <br />n/a denotes not available <br />METHODS <br />The aquatic impairment study was conducted in accordance with guidelines obtained from the <br />Colorado Water Quality Control Division (WQCD). Methods were developed following <br />discussion with WQCD of a draft work plan in November, 1993, and field reconnaissance of <br />the site. <br />Biological Inventory: <br />Biological sampling was conducted at five stations upstream and five stations downstream of <br />the discharge point. Actual lengths of the upstream and downstream reaches to be sampled <br />were limited by the proximity of other potential pollutant sources, including other mines, as <br />well as municipal sources near the town of Somerset. The downstream reach from where the <br />5 <br />