PERMFILE53498 - Laserfiche WebLink

Home Browse Search

Ms. Christina Kamnikaz Division of Minerals and Geology October 11, 1996 Page 3 In areas where broadcasting is necessary, the seed quantity will be doubled to 30 Ibs/acre. Periodically the operator will consult with the Soil Conservation Service for recommendations of any necessary fertilizer. The sizes of trees and shrubs in the reclamation are as follows: • Deciduous trees at 1-1/2 inch cal. • 60% of coniferous trees at 6 foot height • 40% of coniferous trees at 8 foot height • 50% of shrubs at one gallon • 50% at shrubs at five gallon 5) Attached is a copy of the S[ormwater Management Plan developed as a part of the requirements for the S[ormwater Dischazge Permit application to the Colorado Department of Public Health and Environment. This document addresses the storage and containment concerns for all aspects of the mining operation. Included is information regarding the asphalt and concrete batch plants. D) Exhibit G -Water Information Attached to this letter is a copy of the Stormwater Management Plan for Maryland Creek Ranch as submitted to the Colorado Water Quality Control Commission. This document will answer all your questions regarding setup control, runoff, and potential pollution. 1)a) Maryland Creek basin has a 100 year flow of 269 cfs. Vendette Creek basin has a 100 yeaz flow of 96 cfs. These flows are conveyed under Stale Highway 9 by three, 48 inch corrugated metal pipes (CMPs). Whetstone Creek basin a 100 yeaz flow of 66 cfs and is conveyed under State Highway 9 by a 36 inch CMP. After crossing under State Highway 9, all flows eventually end up in the Blue River. The capacity of the three, 48 inch CMPs was calculated to be 388 cfs and the capacity of the 36 inch CMP is 87 cfs. The capacity of the ditch along State Highway 9 is approximately 107 cfs assuming a ditch cross section of a three foot bottom width, three foot depth of flow, and a channel slope of 0.33%. The capacity of the McKay Ditch is approximately 54 cfs assuming a two foot bottom width, three foot depth of flow, and a channel slope of 0.33%. b) The owner of the ditch along State Highway 9 is the State Highway Department and the owner of the McKay Ditch is solely L.G. Everist, Inc. The McKay Ditch ends on the Maryland Creek Ranch property. c) The size of the 100 year, 24 hour storm event is three inches per hour and is taken from the NOAA Atlas II (exhibit enclosed).