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The extraction data conclusively show the dissolved • salt concentrations in 1:1 extracts are comparable to or less than concentrations found in streams of the Axial Basin. As such, the levels of dissolved salts found in the extracts are believed to be comparable to the concentrations found in sur>_sce water runoff. It is further concluded the exposure of disturbed interburden to t•~eathering, during mining, swill not generate a hazardous water quality condition in the Axial Basin on a shurt- term basis. pH and electrical conductivity tests indicate the salt contents of 1:1 extracts from overburden are comparable to the amounts of salts found in surface water and streams of the Axial Basin. Such an interpretation leads one to conclude surface runoff of disturbed soil or interburden, at the Colowyo mine, will not constitute a hazard to local stream quality. Maximum extracted sodium (Na}) concentrations in 1:1 extracts (7.1 meq/L) are comparable to Val levels found in Good Spring • Creek during U.S.G.S. reconnaissance period from 1975-1977. Furthermore, extractable sodium levels found in A and B horizon soils and the interburden do~,m to a depth of 28 feet, on drill hole G-59, are definitely not a hazard to water quality in the Axial Basin. Potassium levels found in extracts from two interburden samples, betcaeen 28 and 54 feet, are approximately t~oice that found in Axial Basin streams (0.33 meq/L). However, this level of K+ in water runoff is not considered great•enough to appreciably increase the salinity of water in Axial Basin. Calcium and magnesium levels extracted from interburden are one third to one half that found in U.S.G.S. data for the U.S.G.S. reconnaissance period (1975-1977). Bicarbonate contents found in .(1:1) extracts range from an insignificant amount (0.79 meq/L) to maximum concentrations • found in Axial Basin streams (8.56 meq/L) during the 1975-1977 period. Bicarbonate levels arc not expected to reach a critical