Laserfiche WebLink
A 42" culvert will be placed in ditch D-1 behind the lube facility. The <br />• location of the culvert is shown on Map 9A, Mines No. 1, 2, and Eckman Park <br />Hydrologic Features and Sediment Control. The design calculations for the <br />culvert are as follows: <br />Drainage Area = 73.9 AC = 3.22 MZ <br />10 yr, 24-hr storm = 1.8M rainfall <br />Assume CN = 79 - - - 10 year, 24-hr runoff = 0.41M <br />Qp = 75 cfs/m (0.41M) = 30.8 cfs <br />From CMP Inlet Control Monograph <br />Q = 30.8 cfs Dia = 42" <br />HW=0.74---D-2.6' <br />D <br />therefore 42" satisfactory <br />In order to aid in the functioning of the culvert a sump will be constructed <br />at the inlets and outlets of the CMP. This should help to reduce sediment <br />buildup in the culvert. The culvert will be maintained by periodically <br />• flushing with water and digging out the sumps. <br />Colorado Yampa Coal Company will utilize a portion of the existing Equipment <br />Parking Lot for an alternate employee coal stockpile and for a 5000 ton <br />stoker coal stockpile. The location of the stockpiles is shown on the <br />Permit Renewal Map 4. <br />The truck dump consists of a three-sided hopper. Bottom-dump or rear-dump <br />trucks will discharge coal into the hopper; a bull dozer can also push coal <br />into the open side of the hopper. Apron feeders discharge the coal onto a <br />seventy-two inch wide transfer conveyor belt which feeds .the coal into the <br />building containing the primary crushers. The primary crushers reduce the <br />coal to 8"'X 0" size. Following primary crushing, the coal is discharged <br />onto a sixty inch wide conveyor belt. This sixty inch belt feeds the coal <br />from the primary crusher building to another building where the coal is <br />discharged into vibratory screens. Any coal greater than 2" X 0" will not <br />pass through the screen but will be deposited. <br /> <br />MR 90-48 780-35 (c) Revised 04/12/90 <br />