Laserfiche WebLink
THE <br />Mined Land Reclamation <br />ATTN; Mr. Dan Matthews <br />1313 Sherman Street <br />Denver, CO 80203 <br />III IIIIIIIIIIIIIIII <br />999 <br />~OCKCASTLE COMPANY <br />April 22, 1983 <br />RE: Grassy Creek Coal Mine O1 water drainage and sediment control on Pit li4 <br />Haul Road <br />Dear Mr. Matthews: <br />As per our telephone conversation earlier this week, I am submitting a proposal <br />addressing the above stated condition. This water will run~only follwing a hard <br />rainstorm or from the melting snow that hasn"t been plowed over the berm in the <br />winter and spring. <br />I am proposing a series of three (3) rip-rap ditches to be located at approximately <br />Station 4 4+00, Station li 20+00 and Station 4 42+00, as shown on our Haul Road to <br />Pit ¢4 Detailed Plan. These ditches will be 4' flat bottom, with 2:1 side slopes, <br />and Lined with 1~,' of rock. They will be flared on the outlet end so as to spread <br />the flow of water. Straw bales will be placed at the end of these ditches to entrap <br />silt and these changed as necessary. Outlet of ditches will drain into already <br />vegetated areas at Station ~ 4+00 and Station 1k 20+00. Station d 42+00 will be <br />temporarily vegetated this summer and permanently seeded and mulched this fall. <br />Station 4 42+00 also has an additional silt barrier created by the trees and brush <br />that were placed parallel to the existing fill slopes prior to haul road construct- <br />ion last fall. The maximum drainage area per runoff ditch will not exceed 0.6 <br />acres. During winter and spring the snow is plowed over the safety berms and the <br />maximum snow that will be left on these areas should not exceed 3" at any one time <br />during normal operating conditions. <br />I feel that these three rock gutters should adequately handle this runoff and tha <br />straw dams should entrap the silt and eliminate any significant amount to sediment <br />runoff. <br />If you have any questions concerning this proposed corrective action, please feel <br />free to contact me. <br />Sincerel yours, <br />~~ ~~~_ <br />Robert H. Sherman <br />Mine Superintendent <br />RHS/hy <br />cc: Korb <br />Raye <br />Dapp <br /> <br />APR 2 51983 <br />MIA!E] LARD] RECLAf'1AT10~! <br />Celo. Dept. of laturzl Resource <br />P. 0. 808 AA 8A48E8, COLO8A80 81639 <br />