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State Req. • v. Wolf Creek Coal Seam Observation wells completed in the Wolf Creek coal seam include GW-S 10, GW-S 14, and GW-S I S. Other wells in the area monitor Wolf Creek seam water level fluctuations only and have not been sampled. These three wells monitor an undisturbed tract of land known as the 4-40 area. Table 7-10 lists the chemical analyses performed for ground water samples from the Wolf Creek coal seam. Basically, these wells yield a low to highly mineralized Co-Mg-SO4 type water with slightly acidic to normal pH, very high hardness; high dis- solved iron, manganese, and sulfate; and low SAR and fluoride concentra- tions. All trace element concentrations are well below the water quality standards in Table 7-4. In terms of water quality, Wolf Creek coal seam ground water is unsuitable for domestic use due to high iron, sulfate, manganese,. and dissolved solids. It is marginally suitable for livestock • use with regard to manganese. vi. Trout Creek Sandstone Aquifer The Trout Creek sandstone is the first aquifer below the lowest coal seam to be mined which may be affected by mining. Its stratigrt~hic position in relation to the Wolf Creek coal seam is shown in Tab 6 by Figure 6-3 and in Appendix 7-I for well logs GW-55 and GW-538. Water quality from the Trout Creek sandstone is monitored from GW-S5, the mine shop production well, and from GW-538. Toole 7-I I lists water quality data for this aquifer. GW-S5 produces a Na-HC03-SO4 type water with a slightly alkaline pH, moderately low SAR and dissolved solids, and slightly high sulfate con- centration. No trace metal concentrations in excess of water quality standards were found in these samples. Observation well GW-S38 was dry when drilled; hence no samples hove been obtained to date. This water is suitable for domestic, livestock, and light industrial use, although persons unaccustomed to drinking sulfate water may experience 7-33 Revised 5/27/81