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~~ <br />Comprehensive Analylital Results Report <br />Fan and Wcst Willow Crcek <br />The data show that large volumes of source material containing elevated metals concentrations are available <br />for release to surface waters. Two solid source samples were analyzed for cyanide but were found to be <br />non-detect. <br />4.2 Aqueous Source Samples <br />-_ Three aqueous source samples were collected from the Nelson Tunnel on West. Willow Creek and the <br />.~ <br />Solomon and Mammoth Tunnels on Eas[ Willow Creek. These samples were analyzed for total and <br />~... <br />- dissolved metals az well az Lab Group B and C parameters. Total and dissolved metals concentrations for <br />--~tese samples are shown in Tables 2 and 3 along with surface water samples to illustrate the effect these <br />-sources have on the receiving streams. The results indicate that the Nelson Tunnel and Solomon Adit <br />~~`~contain significantly elevated concentrations of several analytes, however, the rate of discharge from these <br />sources is very low compared to the flow in West and East Willow Creek (about 1/100th). Metal <br />concentrations in West Willow Creek increase dramatically below the Nelson Tunnel (between SW-08 and <br />SW-10), however, loading analyses (loading calculations are presented in Table 8 and in Histograms 10-15) <br />reveal that only a small portion of this increase can be attributed to the Nelson Tunnel. The discharge from <br />the Solomon Adit pazses through a passive mine drainage treatment system (PMDTS) before discharging <br />to East Willow Creek. Four opportunity samples were collected from the area of the Solomon PMDTS <br />and analyzed for total metals (Table 3). One sample waz collected from each of the three cells and one <br />from East Willow Creek immediately adjacent to the last cell (outflow from the lazt cell was not <br />accessible). <br />Significant analytes present in these sources and their concentrations are summarized below: <br />Creede Mining District Aqueous Source Samples <br />(concentrations in micrograms per liter) <br />nal a Nelson Tunnel Solomon Adit <br /> ' olved otal Dissolved Total <br />Aluminum 1050.0 1080.0 1860.0 1880.0 <br />Arsenic 4.6 4.0 7.2 8.4 <br />Cadmium 301.0 293.0 203.0 198.0 <br />Copper 285.0 287.0 21.9 21.6 <br />Lead 451.0 464.0 1780.0 1760.0 <br />Manganese 4700.0 4600.0 8040.0 8020.0 <br />Zinc 20500.0 19800.0 18600.0 18300.0 <br />5 <br />