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' aoe Bear Coal Company 8580 <br />UTE ENGINEERING & SURVEYING CO. sHEETMO. 1 or-i <br />P. 0. Box 674 355 Main Street CALCULATED BY FDR DATE_ 3-9-80 <br />' DELTA, COLORADO 81416 <br />(303) 874.7593 CHECKED BV DATE- <br />Figure 7..05.3(4) (b)-3 <br />' Bear Mine. <br /> Pond 3 - P7est portal area <br />' <br /> Pond sized to hold all runoff from 10 year - 24 hour event <br />1 '. <br />" <br /> Calculate runoff f.rom.10 year.- 24 hour storm = /ft.=...... .. <br />18/10/12 <br /> .15'/24 hours <br />' Soils:undisturbed Beenon-Absarokee 1008 <br /> area above mine site; <br />.... ... . <br />1 _ .. <br />Hydrologic Soil Group C <br />' Cover. 958 Oak Brush <br /> AMC - II A.CN = 35 .. <br /> Area = 240,000 ft2 . <br /> <br />' Hydrologic .Soil Group B <br />' Cover 0$ <br /> AD7C - II, CN= 80 (no ponding). <br /> ? <br />I .. <br />Area = 40.,000.ft <br /> Unaffected runoff <br />I (P - 0.2S)2 = 0 = P - .25 P = 3.71 ~ 1.8" <br /> <br />P +.0.85 ....... <br /> <br />t :... <br />S = 1 <br />~ - <br />10 = 1-~~ - 10 .. . <br />57 <br />= 18 <br /> CN <br />. . <br />. <br />' ""Amount'of rain to initiate <br />" runoff (ie 4 = 0) <br /> is 3.71 <br />?-1.8" in 10 year - 24 hour frequency event. <br /> <br />No runoff from undistrubed Disturbed .area: Breece Loam <br />.area. <br />~I REVISED May 15, 1981 <br />.OFM :Of Ag401e lrOm /~ S :wc iOrmaM. Mf4 Ou iO <br />