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Sulfate 4 10 50.7 <br /> Depth recorded was lowest ever in October. Iron reading for October was <br /> highest in last five years. TDS was high as is usual for this station. Sulfate <br /> readings were much below normal. <br /> Sutey Underdrain <br /> (Jun) (Oct) (Mean) <br /> Flow 15 1 5.57 <br /> Iron 0.02 0.36 0.12 <br /> TDS 606 698 600 <br /> Sulfate 152 173 152 <br /> Flow was somewhat greater than normal. Iron was low but normal. TDS was <br /> slightly greater than normal. Sulfate was normal. <br /> Tunnel Discharge (NPDES #016) <br /> (Jun) Oct) (Mean) <br /> Flow 75 45 106 <br /> TSS 86 146 130 <br /> Settleable 0.10 0.40 - <br /> Iron 0.17 0.91 1.28 <br /> This is an NPDES (surface) sediment pond which receives water from the <br /> underground mine which has drained out through the tunnel. Monthly <br /> samples are taken. However, since the tunnel became operational only in <br /> August, 1987, there is little background or history for comparison. <br /> Old Refuse Pile, Station #P-7 <br /> (Jun) (Oct) (Mean) <br /> Depth 10.70 11.10 9.89 <br /> Iron 52.8 52.8 56.6 <br /> TDS 1566 1586 1669 <br /> Sulfate 766 799 865 <br /> Depth recorded was lowest ever in October. Iron was slightly below normal, <br /> as were TDS and sulfate. <br /> Old Refuse Pile, Station #P-8 <br /> 7 <br />