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TABLE 11 (Continuted): Mean Water Quality of Contributors to Mine Inflow Water. (1985 Data) Water Quality Parameter TDS Dissolved Fe Dissolved Mn SOq (mg/1) (mg/1) (mg/1) (mg/1) Spoils Aquifer 2330 0.03 2.11 1328 Wells 026-SP-1 and 026-SP-2 Middle Creek Under- ground Mine Inflows 820 0.60* 0.20* 1060 8/10/81 Foidel Creek Mine 2373 5.20* 0.22* 1625 Inflow Site 109, 1985 Avgs. *Total Metal Concentrations Existing mine inflow discharge reflects current water quality impacts to the Foidel Creek drainage. TABLE 11 compares Foidel Creek Mine inflow water quality with that of the spoils spring, Pond D discharge and the receiving stream standard. Both mine water inflows and spoils spring from Eckman Park drain into sedimentation Pond D before discharging to Foidel Creek. There are often high concentrations of TDS, EC, sulfate, silver, cadmium, mercury and molybdenum in the Pond D discharge. Periodically, there are also high levels of copper, zinc and total iron from Pond D. Mine inflow waters from the Fish Creek Shaft are predicted to reflect the water quality of the Trout Creek sandstone aquifer. The water may be described as a sodium bicarbonate water with SAR values ranging from 18 - 20. Should this be the sole component of water being discharged at the Fish Creek Borehole Shaft, average low flows in Fish Creek would dilute sodium's influence to produce an SAR of 2.1. This would further be reduced downstream on Trout Creek to 0.9 (TABLE ~). Backfilled spoils water quality is probably quite representative of discharge from the flooded workings, which as discussed in Section V has a higher concentration of salts than regional ground waters and surface waters due to the increased solubility reactions resulting from rubblization of the overburden. Backfilled spoils waters have Total Dissolved Solids (TDS) concentrations which range from 2711 to 4200 mg/1. These predominately magnesium sulfate waters have high concentrations of manganese, zinc, sulfate and nitrogen species. Mine inflow waters are derived from the Wadge overburden and Trout Creek sandstone aquifers, which are predominately sodium bicarbonate waters. Foidel Creek and Trout Creek are calcium, magnesium sulfate waters while Fish Creek and Middle Creek are magnesium, calcium sulfate waters. Current mine inflow waters are magnesium, calcium sulfate waters, reflecting contamination from a salt plume from the adjacent surface mine. As peak mine inflows are expected within the first five years of -45-