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4-37 <br />• Creek is incised into alluvium; in the upper reaches the <br />creek is contained within narrow canyon walls. Because these <br />channels are relatively deep in most area, the 100-year <br />floodplain should be less than 30 feet wide in most areas. <br />During extreme flood events, when flow exceeds the capacity <br />of the road culverts, the floodplain will become relatively <br />wide immediately upstream of the road crossings over Munger <br />Creek. <br />Local runoff from the waste rock pile and the immediately <br />surrounding area will be controlled by a series of diversion <br />ditches and settling ponds. This system was described in <br />Section 2.2-5. <br />4.5.3.4 Water Quality <br />4.5.3.4.1 East Salt Creek Near Mack <br />Water quality in East Salt Creek varies widely. According <br />to the West Central Colorado Coal EIS, specific conductance, <br />which provides an indirect measure of dissolved solids <br />concentration, ranged from a high value of 13,500 micromhos/ <br />cm on April 26, 1974 to a low of 779 micromhos/cm on May 21, <br />1975. These values are not listed in the water quality records <br />obtained from the U.S.G.S. These extremes represent dissolved <br />solids concentrations of about 10,000 mg/1 and 600 mg/1, <br />respectively. <br />The water quality of East Salt Creek is described in the West <br />