2001-12-11_PERMIT FILE - C1982056A (5)

Home Browse Search

outslope culvert. Tab 3.7 provides the design for culvert D-3B. Tab 3.8 provides design for culvert E-1-A. Tab 3.9 provides design for culvert E-2-A. Tab 3.10 provides design for culvert D-1-C. Tab 3.11 provides design for `culvert E-2-B and E-2-C. Tab 3.12 provides design for culvert D-1-A. Tab 3.13 provides design for culvert D-1-B. Tab 3.14 provides design for culvert D-1-D. Tab 3.I5 provides design for the Perry Properry access culvert. Tabs 4.1 through 4.2] provide SAE demonstrations. Tabs 5.1 through 5.3 provides information on hydrology and sediment transport modeling for Pond E. Tabs 6 through 6.2 provide information on spilling design for Pond E. Tabs 7.1 through 7.6 provide peak flow calculation for various sites at the mine. DRAINAGE CONTROL PLAN Foidel Creek Mine Surface Facilities Area Ditch D-l runs along CYCC's Haulroad B and delivers the runoff to Pond D. The underground mine is dewatered by pumping from a sump located adjacent to the First Main North through the portal borehole. Once the Fish Creek Borehole is completed, water can be discharged from both locations. The discharge from the portal borehole flows into Ditch D-2. Ditch D-2 drains the area along the access road to Sedimentation Pond D. Ditch D-3 redirects runoff from the reclaimed land south of the portal area and carries it around the low quality coal stockpile and the coal preparation plant azea to Pond D. The coal stockpile area drains to either a sump located near the Dry Storage Building or to Pond E. Pond E also receives drainage from a portion of the mine facilities area via Ditch E-2, the shop/warehouse area via Ditch E-l, runoff from the former stoker coal stockpile small area exemption via Ditch E-3, surface runoff from those portions of the preparation plant facilities area on the north side of the overland conveyor, and discharge from the prep plant sump. Mine water discharge from Site l09 and the Wadge Sump (these flows will be diverted to Site 114 (Emerald springs). Drainage from those preparations plant facilities on the south side of the overland conveyor is either intercepted by Ditch D-3 or moves as direct overland flow to Pond D, Ditch D-4 runs along the toe of the spoil south of the facility and drains into a sump. From there the water is pumped into the lower segment of Ditch D-2 •and drains into Pond D. A series of smaller diversion ditches control the runoff around the coal stockpiles, the office and shop buildings, and along the ramps leading out of the pit. These ditches meet the minimum design criteria as presented in the appropriate "Tab". Sedimentation Pond F handles the runoff associated with the Shop/Maintenance Area and Access Road, and discharge from Site 114. The surface facilities east of the portal area are drained by a series of diversion ditches, which carry the runoff into Sedimentation Pond G. Ditch G-l diverts the runoff from the reclaimed lands south of the portal area. Ditches G-2 and G-3 carry the runoff along the haulroad into Pond G. FCB Treatment Facility The access road into the FCB Treatment Facility is drained by a series of low water crossings and two (2) or three (3) culverts. The eighteen (18) inch culvert designated for placement at Station 1+00 may not be installed. Instead, Twentymile coal Company may use another type of water control system such as a low water crossing or building up the road base. Regarding the discharge site, mine inflow water will be channeled through silt collection rooms and will then be pumped from a sump adjacent to the 2nd Main West up the dewatering boreholes) and into the FCB Treatment Facility located next to the boreholes. This facility will hold only discharged mine water. A diversion ditch will divert the adjacent area surface runoff aua}~ from the facility; consequently, it will not store surface runoff. Twentymile Coal constructed 2 dewatering boreholes, each with pumps having a maximum to pump N a capacity of 500 - 600 gpm. The pumps will be used alternately and possibly, at times, simultaneously. Thus, the maximum expected discharge will be 1000 - 1200 gpm. r~ U Permit Renewal No. 3 Tab 1 Page 2 1/15/00