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999 <br /> <br /> <br />August 12, 1983 <br />1590 WEST TW ELFTH AVENU E, DENVER,COLORADO GENERAL OFFICE 5343165 <br />P.O. BO% 5183 T.A. 60217 DISPP TCH • ORDER 534-SAND <br />RECEIVED <br />Mr. James B. McArdle <br />Mined Land Reclamation <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />AUG 16 X983 <br />UNMED tAMD @Ei"drllrUtl§~1 @r.WSa@ <br />1kle. ~tipl. ,fit ~6bitu~ai {~gs9~µr~e;, y <br />RE: PERMIT 74-4, SPEC. AGG., <br />INSPECTION REPORT <br />Dear Mr. McArdle: <br />Pursuant to your inspection of the property and your subsequent letter dated <br />July 5, 1983, the reply to your observation of importance is as fellows: <br />1) In reply to Bob Liddle's memo of April 28, 1982 concerning <br />the sizing of the Jackson Gulch drainage diversion. <br />As pointed out in Bob's memo there may be <br />an error of 20% in the peak flow used in <br />the channel sizing. We have no problem <br />in using a 20% higher peak flow in sizing <br />the channel. With a 20% higher peak flow <br />the discharge would be 87.72 cfs (73.1 x 1.20). <br />MOBILE PREMIX SAND & GRAVEL CO. <br />A Division of Mobile Premix Concrete, /nc. <br />Method For Determining Bench Channel Is The <br />Manning Equation. <br />V = 1.486/n R 2/3 S 1/2 <br />Using the following channel design with a slope <br />of 1/4%: <br />