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4-25 <br />• 4.5.3.1.2 Seasonal Flow Variations of East Salt Creek <br />In order to show the seasonal variations in flow, mean monthly <br />discharges were calculated and portrayed graphically in Figure <br />4.5-3. As can be seen mean monthly quantities are small, <br />ranging from a high of 27.7 cfs in May, to a low of 0.2 cfs <br />in January. Figure 4.5-3 also reveals that most of the annual <br />streamflow volume is delivered in May; over 50 percent of the <br />total annual flow occurs during May. This is contrasted with <br />January, which contributes less than 0.4 percent of the annual <br />flow. Regardless of the absolute monthly discharge values <br />of East Salt Creek in the future, it can be reasonably assumed <br />that the seasonaly distribution pattern, as presentd in Figure <br />4,5-3, will be generally followed. Seasonal variations in <br />• quality are addressed in general terms in Section 4.5.3.4 <br />with specifics to be established through a monitoring program <br />addressed in Section 2.5 over the estimated 30 year life of <br />mine. <br />4,5.3.1.3 Reliability of the East Salt Creek Record <br />A 20-year period of record is generally considred to be an <br />adequate basis for making long-term hydrologic predictions. <br />The 6-year record available for East Salt Creek near Mack <br />cannot, by itself, be considered a reliable indicator of <br />long-term flow conditions. In order to examine the reliability <br />of the East Salt Creek data, a correlation analysis was performed <br />• <br />