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• All sites have been sampled and analyzed for 17 parameters, including arse- nic, bicarbonate, cadmium, iron, lead, magnesium, manganese, mercury, phospho- rus, selenium, sodium, sulfate, total dissolved solids, total suspended solids, total volatile solids, and zinc. Samples were taken by Sun Coal personnel and sent to Bookcliffs Laboratory in Steamboat Springs for analysis. The water quality of the Yampa (Tables 2.04.7-5 and 2.04.7-61 is relatively • consistent and does not appear to have been significantly affected by any con- tamination from past mining activities. All concentrations are within water quality standards with the exception of iron and manganese. There is no increase in the concentrations of these two parameters from the upstream site to the downstream site. A significant increase was seen in total volatile solids at the downstream site (Table 2.04.7-6) several times from 1982 to 1983. There is no known cause for these higher concentrations. The parameter concentrations corresponded with USGS Yampa River water-quality studies done. The concentra- tions of most parameters were generally higher during the periods of low flow in the fall and winter months. The average ground water quality (Table 2.04.7-3) concentrations were • generally higher than the concentrations of the Yampa River (Tables 2.04.7-5 and 2.04.7-6) with the exception of manganese, total suspended solids, and total volatile solids. There appears to be no significant difference between the wells and the surface water for these parameters. Concentrations of arsenic, cadmium, mercury, and selenium are at or below detection limit in both the wells and the Yampa River. Other parameters, including bicarbonate, calcium, iron, lead, magnesium, phosphorus, sodium, sulfate, zinc, and total dissolved solids averaged three times higher in the wells than in the Yampa River. At this time there is no known reason for these higher levels. The well near the trailer - 102 - (Rev. 5/86)