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4-20 <br />(TDS = 2536 mg/1) and on November 4, 1961 (TD5 = 2371 mg/1). <br />There was no flow at the lower East Salt Creek station on <br />July 12, 1981. <br />Testing for metals in all three quarterly samplings indicated <br />that, at both sites, the only constituents that occur above <br />the detection limits set by the laboratory are Boron, Manganese <br />and Zinc. Below are the levels of these metals in the analyses: <br />Date Site B(mg/1) Mn(mg/1) Z(mg/1) <br />4-29-81 Lower East Salt Creek 0.20 - - <br />4-29-81 Upper East Salt Creek 0.16 0.075 - <br />8-12-81 Upper East Salt Creek 0.32 0.726 0.017 <br />11-04-81 Lower East Salt Creek 0.22 0.21 0.02 <br />11-04-81 Upper East Salt Creek 0.30 0.15 - <br />4.3.4 Hydrologic and Hydraulic Information and Application <br />4.3.4.1 Hydrologic Analyses <br />Hydrologic analysis for East Salt Creek near the central facili- <br />ties site was completed using the Colorado Water Conservation <br />Board Technical Manual No. 1 (McCain, 1976). The manual was <br />prepared by the Colorado Water Conservation Board in cooperation <br />with the U.S. Geological Survey and is regarded as the most <br />applicable method for determining peak flows in ungauged streams <br />in Colorado at this time. The manual contains methods for <br />calculating peak flows in several climatic regions of the state. <br />The regions of interest in the East Salt Creek drainage are the <br />Mountain and Southern Plateau Regions. The mountain region, <br />generally above elevation 7,500, experiences peak flows caused <br />by spring snowmelt runoff. The peaks generally occur in April, <br />May or June. The Southern Plateau Region of southwestern and <br />western Colorado is located below elevation 7,500. Peak flows <br />in this region are usually caused by high intensity thunderstorms <br />in the summer months. <br />