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,uu Dear Coal CmnL~any _ <br />' UTE ENGINEERING & SURVEYING CO. I <br />i'. U Liox 614 443 Du~6c "~ ~ ~ ~~, <br />DELTA, COLORADO 81416 ,,,,,,,,,,,,,,,,,, 1'i)R <br />(303) 874.7593 <br />u.ec.En n~. --. . <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br />Rev.i~corv~ ahe noted ~.n Sc <br />Figure 2.05.3(4)(b)-1 <br />Bear P+ine <br />North of River <br />Pond k 1 <br />--- -- --85.80_ - <br />•~ _ <br />unit '-4-80. .. <br />n n r e .-- ~ -- ----- -- <br />Sedimentation Pond sizing to hold all runoff from 10 year - 24 hour <br />storm <br />Calculations: RunofL from 10 year - 24 hour storm = (1.8/l0i" _ <br />1. 8" = 0.15'/hour <br />P = i.8 bnom P~guhe 28, NOAA At2n.~ 2 Pnec~,p~-tati.on -Frequency Atlas ob the (ve~.te~cn <br />Un,tted StA,tes, Volume III - Coronado, page 37. <br />Soils--Disturbed urea: <br />Torriorthents Haplargids - thick cover of coal in some areas <br />:,rea = 176,000 ft2 <br />Hydroloqic Group R <br />AP1C-II, CN=80 (no ponding) <br />-(P-0.2S)` p=Direct Runoff (in) P=Storm Rainfa.Ll (in) <br />r+0.85 <br />_,000 5=:°arimum potential difference between <br />S yCN - 10 O and P in inches. <br />CN=Curve number <br />Runoff <br />_1000 _ 10 = ]000 _ 10 = 2.50 ~_ L1.8-0.2(2. 50 )J 2= 0.44 <br />CN 80 [1.8+.8(2.50)] <br />Volume=(0.44"/12"/ft)(176,000)ft2=6453 ft3 (0.148 ache-6eezl <br />Sediment <br />A=RF:LSCP R = 40, bnomgqPned.~eLing Ra~.nba~2 Enohlon Lohaea, U.S. Depwctment <br />Area divided into 3 segm~nts~eu2ttUie, F<gwce 1, page 6. <br />Segment 1 : 7 5' feng,th, 0.5°s hXope <br />Segment 2 75 ' 2eng.th, 27 $ hoope <br />:;cgincnt 3 : 7 5' length, 7 °s hf'ope <br />I'=. 69 (hicjhest '/alun by r'r:pcriment) <br />~.l ,1.• •.,~y01e 1~G ~. ~.\'f: Ll.'i l~..rfr~.:: I.I.~.f Oi. ]C <br />RFVT CF'rc .. .. lC fool <br />