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i State Rea. have experienced sane degradation as evidenced by hider dissolved i solids and sulfate oor~ntrations. 4hese data, however, are not conclusive as to the source of contamination (i. e., mining versus fly ash). iii. Wadge Coal Seam Aquifer ~ wells, GW-517, GW--519, and (W-S40-W, monitor ground water quality in the Wadge opal seam. The chemical analyses for these wells are listed in Table 7-8. prmninim water quality for the Wadge dual Seam aquifer is monitored by GW-540-W. ?his well yields a slightly mineralized Na-H~3 type water with a slightly alkaline pH, moderate to high hardness; high manganese, mercury, and ammonia levels; and low sulfate and fluoride rnnoentrations. These initial analyses terd to show that Wadge coal seam water is similar in quality to Wadge overburden, but is generally less suitable as a source for domestic and livestock use. Slightly hider ~ntrations of boron and nitrogen were also detected in the coal seam water. 'These wncentrations, haaever, do not exceed the water quality standards in Table 7-4. 4he increased levels of boron arri nitrogen in coal seam water are probably related to the on7anic nature of the strata. The water chemistry in C~]-S19 is unique insomuch that it has an abnormally high pH. Basically, this well yields a Na-HQ03-o03 type water with high SAR and carbonate alkalinity, high fluoride, ammonia, and/or hardness, sulfate, arxi manganese levels. Its water quality is poor for danestic use, but is aoxptable for livestock. The unusual composition of this water can be explained by cation exchange and sulfate reducing mechanisms such as those proposed by Moran (1978), Hounslow (1978), and others. Iran calcium and sulfate concentrations in this water indicate that mining upgradient of this site has not yet caused changes in water quality. i~ 7-25 Revised 10/17/94