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42,05 APPLICATION FOR PERMIT FOR SIIRFACE OR UNDERGROUND MINING ACTIVITIES -- <br />,~,,, MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2,05.6 Mitigation of Surface Coal Mining Operation Impacts. (Cont`d.) <br />(3) (b) (i) (Cont'd.) <br />Storm run-off is basically generated in four <br />zones of the Orchard Valley Mine site. As <br />shown in Figure 2.05-9 in the Surface Drainage <br />Appendix, Volume 8, Zone 1 lies on the west <br />side of the lower diversion basin. The drain- <br />age area includes the portal level area, the <br />fan level access road, and around the ware- <br />house level. Run-off from this area is dis- <br />charged at Node 1. Zone 2 includes the fan <br />level and is discharged at Node 7. 7.one 3 in- <br />cludes an area east of [he portal level and <br />[hat area above the old Converse Mine portals. <br />Run-off is discharged at Node 10. Zone 4 gen- <br />erates water from the remainder of the water- <br />shed, including the crushing and screening <br />level, and is discharged at various locations <br />into the natural channel downstream. Table <br />2.05-5 shows a summary of design discharges <br />for mine site drainage. Design flows at the <br />. mine site are set forth in the Surface Drain- <br />age Appendix in Volume 8. <br />TABLE 2.05-OS <br />DESIGN FL04i SUMMAF,Y SHEET - P1INE SITE <br />See Surface Water Appendix <br />APPROX. DESIGN <br />20NE NODE AREA DISCHARGE REMARKS <br />N0. UPSTREAM 100-YEAR2 <br />(acres)1 (OPP) <br /> 11 33.7 3995 550 cfs design <br /> flow <br /> 12 50.6 5905 550 cfs design <br /> flow <br />13 1 18,3 28 GN for 100-yr, <br /> storm = 80 <br />23 7 18,5 26 CN for 100-vr. <br /> storm = 80 <br />33 10 17.0 40(25)4 CN for 100-yr. <br /> storm = 80 <br /> (OPP peak for CN) <br /> 80 = 25 c.f.s. <br />. Revised 08/01/84 <br />Corrected 10/12/86 <br /> Revised 10/01/87 <br /> 102 <br />