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<br />Table 3 - SEDCAD 4 Parameters: Pre-minin <br /> Trapper's Trapper's basis for <br />Parameter selection selection stated on page 12 Division s comment <br /> of submittal <br /> 2.75 inches in 24 hours is <br /> Produces minimum 0.5 inch historically high for Trapper's <br />Design 2.75-inches <br />of runoff that is necessary to climate, but is necessary because <br />event in 24 hours SCS TR-55 questions the accuracy <br /> maintain program accuracy. of the CN method when runoff depth <br /> is less than 0.5 inch. <br /> Trapper's selected cover, Reasonable based on reasonable <br />CN 48 soil group, hydrologic selections of cover, soil group, <br /> conditions, and CP Factor hydrologic conditions, and CP factor <br /> (see below) (see following comments). <br />Arid & semi-arid Reasonable because, of the five <br />rangelands, oak- cover descriptions in Table 2.2d of <br /> None TR-55, this one most accurately <br />aspen -mountain represents the pre-mining cover on <br />brush mix cover type the bond release arcels. <br /> Reasonable because "fair" <br /> corresponds to 30% to 70% ground <br />"Fair" hydrologic cover and Trapper's undisturbed <br />condition None cover density on the bond release <br /> parcels was estimated to be 60% as <br /> shown in Section XII of Appendix Q <br /> of the ermit a lication. <br /> Reasonable because infiltration rate <br /> of B is 0.15-0.30 inches per hour. <br /> This infiltration rate is consistent <br />Hydrologic soil with pre-mining infiltration rates of <br />group classification None Trapper's soils estimated by the Soil <br />"B" Conservation Service under <br /> saturated conditions as shown in <br /> Appendix G, Part III of the permit <br /> a lication. <br />Page 3 <br />