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<br />• <br /> <br />RSN Operational Drainage to Pond 4 <br />Calculation Rational and Results Summary <br />Rational: <br />- Calculated using Sedcad+ Ver. 3 <br />- Areas, slopes and flow paths digitized from 100 scale topo maps flown in 11/94. The <br />attached 200 scale diagram represents the subwatersheds digitized. <br />- The soil map, Exhibit 23, shows the area as Area 80 -"Stony Land". There is no <br />defined soil group associated with this soil therefore Table 5.1 in the Sedcad reference <br />manual was used to determine a soil group. Generally the soil samples for this and <br />other disturbance areas classifies the soil to be sandy to silty loam (Tab Section 9) <br />which equates to a "B" soil group. A "D" soil group was used for operations areas <br />where clays from the mining operations may be incorporated in the surface. The <br />following CN's were used in the calculations: <br />86 - B soil group, fallow, baze soil, Used for topsoil piles, ponds and dirt <br />slopes. <br />92 - D soil group, gravel road. Used for pazking, storage and stockpile areas. <br />- 10 yeaz 24 hour storm event of 1.4" <br />Results Summary: (other information may have been generated in this section but is not <br />being used in the site drainage design at this time) <br />Structure # Structure Description <br />Design <br />111 East collection ditch 1:1 side slopes, 1% grade, 1" min. depth <br />112 Culvert from E. collection <br />ditch to Pond 4 1% grade 8" required 18" in place <br />RSN-14 (New 3/1/96) <br />