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Portal $1 Reclamation Channel page 1 <br />INTRODUCTION <br />Closure of the mining operation entails the design and <br />construction of a diversion channel away from the Portal #1 site. <br />The plan is to construct one or more channels that would convey <br />snowmelt or storm runoff away from the reclaimed portal area. <br />Flows would be directed onto undisturbed areas in the vicinity of <br />the original drainage. It is proposed that the rerouted flows be <br />directed ~3s.t of the existing portal. Below the reclaimed <br />portal, flows would be returned to the original path. <br />FLOW VALOES AT PORTAL #1 <br />The drainage area that could contribute to the reclaimed Portal <br />#1 site was measured on a 1 inch = 500 feet, 40 feet contour <br />interval map. This area was measured to be 16 acres. To be <br />conservative, the drainage area was assumed to be 20 acres. The <br />hydrology developed during the initial permitting process was <br />reviewed. It was determined to be appropriate for this <br />reclamation phase. <br />Water ~ Environmental Systems Technology, Inc. April, 1994 <br />