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Stale Reg. a laxative effect (Fetter, 1980). The high salinity and low to medium • sodium hazard of this water will restrict its use in irrigation to salt tolerant plants grown in well drained soils (USDA, 1969). A discussion of the present uses of this water is covered in Tab 12, Operations Plan. vii. Alluvium Four wells, GW-S6-A, GW-S31, GW-532, and GW-533 monitor alluvial water quality in the mine plan area. Except for GW-533, all alluvial i wells are located up and downstream along Little Grassy Creek. GW-S33 i is located at the confluence of Little Grassy and Grassy Creeks next to the mine shop area. Ground wafer chemical analysis from these wells ~ are listed in Table 7-12. Alluvial ground water quantity in the mine plan area is variable and complex. Most wells produce a slight to highly mineralized Co-Mg-504 or Co-Mg-SO4-HCO3 type water with near normal pH and high sulfate • concentrations. Most trace metals are present in low levels, however, high manganese was detected in all wells. This water is unsuitable for domestic use due to high dissolved solids and sulfate levels. It is con- sidered to be acceptable for livestock use. viii. Reclaimed Spoil Three wells, GW-525, GW-526, and GW-527, and one concrete lysimeter are used to monitor ground water quality in reclaimed Wadge spoil areas. Chemical analyses of samples collected from wells are presented in Table 7-13. Appendix 7-8 contains all chemical dots collected at the lysimeter site by the U.S. Geological Survey. Spoil wells produce a highly mineralized Ca-Mg-SO4 type water with normal to slightly alkaline pH, very high hardness, dissolved solids, high sulfate and manganese, and low trace element concentrations. The chemical quality of these wells are unsuitable for domestic and irrigation • use but is suitable for livestock. 7-38 Revised 5/27/81