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2.04.7 Hydrology Description <br />Stockponds Within Permit and Adjacent Area: <br />Numerous stock ponds, all having a storage volume less than 20 acre -feet, <br />have been identified within the permit and adjacent area. These ponds are <br />man -made and historically serve as stockponds. Limited domestic stock use <br />has been made of these ponds in recent years. The ponds are sited to <br />collect run -off during the spring season and some are located to accumulate <br />flow from colluvial springs and seeps. Although the ponds are a significant <br />hydrologic feature of the permit area and their existence is currently <br />important to wildlife, total contribution of these ponds to the local water <br />budget is not significant. <br />Surface Water on Mine Site: <br />Surface water runoff associated with the surface operations is controlled by <br />the drainage plan. All surface runoff is either routed through sedimentation <br />ponds or treated with some form of alternative sediment control.(b)(i) <br />Minimum, maximum, and average flow data identifying seasonal variations of <br />low flow and peak discharge rates are presented in this section and in <br />Volume III, Exhibit 3. <br />Generally, seasonal variations in stream discharge shows peak rates in late <br />spring and early summer (April - July). Low flows begin in October and end in <br />March. Daily peak flows are typically around 12 midnight and low flows are <br />around 12 noon, due to snowmelt. <br />(b) (ii) (A through G) <br />Water quality data identifying seasonal variations are presented in this <br />section and Volume III, Exhibit 3. <br />Generally, seasonal variations in water quality are functions of flow rates. <br />Total suspended solids and flow peaks coincide due to the erosional nature <br />of run -off due to snow melt events. <br />The quality of water in Stevens Gulch is good. The following data are based <br />on the monitoring location (SW -05). <br />PR -14 2.04-56- 03/14 <br />