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'~j -rte ~i~- • • III IIIIIIIIIIIII III Azurite, Inc. 10001 CR 12 P.O. Box 338 Cotopaxi, CO 81223 (719)942-4178 Fax: (719)942-4178 December 7, 1996 Ms. Kathryn Dolan Colorado Department of Health WQCD-PE-B2 4300 Cherry Creek Drive South Denver. CO 80222-1530 COLORADO DISCHARGE PERMIT STORMWATER CERTIFICATION COG-500912, THE AGGREGATE SOURCE, INC., FREMONT COUNTY Dear Ms. Dolan, Please be advised that Tezak Heavy Equipment Co., Inc., the owner of THE AGGREGATE SOURCE, INC., and holder of record of Mining Permit M-77-193 with The Colorado Mined Land Reclamation Board, has filed for an amendment to Permit M-77-193 in order to increase affected land acreage from 35 to 100 acres for the purposes of expanded mining area ;35 ac), and construction of a stormwater management control system(30 ac), located immediately North of the current mining area. The original Stormwater Discharge Permit COG-500912 includes a stormwater flow path reflecting historic drainage in a Southernly direction towards Tunnel Drive. Three sediment ponds are currently collecting stormflows for sediment control The mine permit amendment as proposed will entail the construction of four additional sediment ponds increasing the stormwater discharge holding capacity to approximately 20 acre feet (from less than 2 ac-ft) and the diversion of stormwater outfalls to the North away from Tunnel Drive. The new stormwater plan is designed to result in zero discharge to Tunnel Drive up to a 100 year event. A map of the site showing existing routing of stotmflows and the proposed stormwater plan are included in this coorespondence. The proposed stormwater management plan has been designed and engineered to protect residents and city property from stormwater damal;e in the event of major storm event by diverting stormflows from the watershed above and immediately West of the mining area, and mining area stormflows into the series of elongate storm sediment ponds connected by geotextiled and rip-rap lined spillways and ditches. A copy of all watershed estimates of 10 year and 100 year storm event with total volume discharge and peak discharge and the narrative of the Stormwater Management Plan as submitted to the Division of Minerals and Geology in the Mining Permit Amendment Application pages 6-10 in also included in this coorespondence. A complete copy of the engineered drawings of sediment control stnrctures is available at your request. The Division of Minerals and Geology has requested that The Division of Water Quality Control review the Stormwater Management Plan and comment on need for a NPDES permit for this operation (does not presently) based on stormwater total voltune projections for storm events