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4- 38 <br />• <br />• <br />• <br />Central Colorado Coal EIS as follows: "During winter months, <br />the water is typically a sodium, calcium, magnesium, sulfate <br />type. With increased runoff in the spring, magnesium con- <br />centrations increase at the expense of calcium and the water <br />changes slightly to a sodium, magnesium, calcium, sulfate <br />type. During the summer and fall, calcium concentrations <br />increase notably and the water changes to a calcium, sodium, <br />magnesium, sulfate type. Most importantly, the dominant <br />cation remains sulfate year round." <br />The U.S.G.S water quality records were examined from the <br />perspective of OSM Regulation 783.17, and the data per- <br />taining to the parameters required by that regulation were <br />analyzed. 'Both annual and seasonal variations in water <br />quality parameters were calculated and the results are <br />presented in Table 4.5-7. <br />In general, conductivity exhibits winter highs and spring <br />lows; pH is high in winter and spring, but low in summer. <br />Iron varies throughout the year, although maintaining a <br />relatively constant mean value; manganese is highest in <br />both winter and summer, but lower in spring. Dissolved <br />solids concentrations appear high in winter, but .both low <br />and high values occur in spring. <br />4.5.3.4.2 East Salt Creek in the Vicinity of Munger Creek <br />Sheridan Enterprises, Inc. has conducted a water sampling <br />