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The permit limitations were exceeded only once and that was for zinc in <br />the No. 5 Mine discharge. In addition, cyanide, silver, and thallium have <br />not been detected in either discharge, and cadmium and copper have not <br />been detected in the No. 5 Mine discharge since the NPDES monitoring <br />began. Also the maximum suspended solids concentration was 36 mg/L, which <br />was measured in the No. 5 Mine discharge. <br />/ The water quality of the "E" Seam is very similar to that in the "F" <br />/ Seam. An analysis of "E" Seam water is presented on Table III-lOg. The <br />/ sample was collected from a monitoring well completed in an underground <br />/ core hole in the No. 5 Mine. <br />3.4.5.4 Water Quality of the Alluvium <br /> <br />The water quality of the alluvium in the Yampa and Williams fork <br />alluvial valleys is of generally poor quality. It is unsuitable for <br />drinking water and is locally unsuitable for agricultural purposes. There <br />is high variability in the water quality between wells of the same <br />alluvium. The water quality of the alluvium may be related to the <br />lithology of the underlying bedrock and/or it may be related to the <br />effects of irrigation. The water quality of the alluvium does not appear <br />to be related to the water quality of the surface water. <br />Williams Fork Alluvium - Ground water samples have been collected <br />from 6 wells completed in the Williams Fork alluvium. These wells are <br />numbered AVF-1 through AVF-6. Samples have been obtained approximately <br />quarterly beginning in June, 1981. A statistical summary of the ground <br />(REV. 2/14/86) <br />III-64 <br />