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91 10:48F1M COLOWYO CORL <br />".nSF:.CTGFS r~ <br />:' ~ `•EE~S <br />'.~'i.c'_i:FE?S <br />tAORRIS0N•KNU0SEN COMPANY, INC. <br />~~'.'~'~° ~ rl~~h~. J9F w c;p7n <br />.. +';r. •N:Y ~ e:.i!F iQ~Mf, L11791 L' i.~ <br />~:'R. ~.bl ]tl&&7m'iiLEx; .16W:19 <br />Seitember 11, 1986 <br />fi; . D.7. Rc.e <br />~~~c:•ations lianager <br />YzTra Hining Company <br />p.0. Hox HH <br />H.s;c:en, Colorado 81639 <br />Darr Hr. Rose: <br />P. 8it3 <br />III IIIIIIIIIIIIIIII <br />999 <br />Subject: Tipple Pon4 B Storage Capacity (outfall 007) <br />1 h~:ve reviewed the design calculations and as-built water seed survey <br />dr,ta for Pond "E" located at the Tipple Area of ifie Hayden Gulch Hine. I <br />a:r. a re~istared Professional Engineer in the Statc of Cclor:da and as <br />I•xp.:~ri.enced in the design and construction of water control s~:vetures. <br />':?:,; rutpose of the review was to determine the nffeet:•, if any, of the <br />,.:. L+:.li.lt watec shed survey information an the design capacity of Tipple <br />~.,„d "8'•. Using the original design formula with the as-built data, <br />:r,lrul. Lions indicate a 25-y<:ar, 2A-hour stoma event would result in 1.57 <br />c:~ f•:et of water in Pond "B". Ti;is combined with 0.16 acre feet of <br />::e;ii:::~i',t capacity yields 1. )3 acre feet of storage capacity needed to <br />r'u::L•aiii a 25-year, 24-h,:~r storm event. A recent as-built :survey of Pond <br />"L'"" iiidicatar a maxi:m;:n rtoc•age capacity of 2.17 acre feet. <br />~~: 3.:: i.n my opinion, b:...ed <br />•1at.n, that :ipplc Pond "R" <br />:,1:cr::: event with a 1 foot <br />:;:f.c:Y:ati.on ;md pa: •: const <br />C1;C.KD >.~cq;.,irc:pants, <br />un the oriGi.nal design assumptions end s~~-built <br />will contttiii the n:rotf frcm a 25-year, 24-hour <br />r.:it~ir,:ul:~ ft•t:eUo:rd and no dicchsrgc. `Aith this <br />-uction certification, t};i.a Pond ar,oul•3 nnet the <br />,~'` ,. <br />:qv %,, <br />.7;';„; O'f.au;h]i~n - ~o Lorado Re~i.~lt~i•eci~P'ft;, 4i~'.:.l i,3A1.. <br />t <br />2000h ~'r~h eru~~~``~ <br />