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,~ _ ~r~n <br />(B) The capability of an area to be flood <br />irrigated, based on stream-flow water yield, solid, water <br />quality topography and regional practices; or <br />(C) Subirrigation of the lands in question, <br />derived from the ground water system of the valley floor. <br />(4) Application contents for operations affecting alluvial <br />valley floors. <br />RESPONSE <br />(1) (2) (3) (9) The Hayden Gulch Mine area cannot be <br />categorized as an alluvial valley floor. The mine site <br />is located in an upland area and there are not streams <br />or running water on the site. Surface water is present <br />only during brief periods of snowmelt or runoff from <br />intense periods of rainfall. <br /> <br />Plots of stratigraphic cross sections are illustrated <br />in Volume 7, Appendix R, Exhibits 7, 8, and 9. It can <br />be seen from these plots that there are no unconsolidated <br />streamlain deposits holding steams. <br />• There are no significant agricultural activities <br />in the area. The climate of the mine area and surroundina_ <br />vicinity is characteristic of semi-arid steepe regions. <br />The average precipitation of the mine area is approximately <br />41 centimeters (16.1 inches). <br />The mine site is located in the highest portion of <br />the drainage area. The channel is of high slope with <br />the channel indegrading (cutting) regime resulting in <br />no deposition. The general channel geometry is of low <br />meander pattern with overall immature channel development. <br />These facts substantiate the fact that the mine area <br />cannot be categorized as an alluvial valley floor. <br />a~ <br />