2010-12-08_PERMIT FILE - C1981008A (9)

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as CDMG may agree that they are no longer necessary. The surface water monitoring installation will be removed upon completion of the postmining phase of the Hydrologic Monitoring Program. All surface water data collected at each monitoring site in each future water year will be compiled and submitted to the CDMG in the form of the New Horizon Annual Hydrology Report (AHR) within three months after the end of each water year. Future AHRs will include copies of quarterly NPDES discharge monitoring reports for each NPDES monitoring site submitted to the Colorado Department of Health during the same water year. Stream Buffer Zones The stream buffer zone along Calamity Draw (land within 100 feet of a perennial stream or stream with a biological community as defined by Section 4.05.18(3) of the CDMG regulations) will be affected by associated disturbance activities within the New Horizon 2 area (see Map 2.05.3 -1). The mining and operations plan for New Horizon 2 has been developed so that there will be no disturbance to the main channel of Calamity Draw. Disturbance within the buffer zone will be limited and consist of activities related to the construction of a drainage ditch C -18 (formerly East Ditch) to convey runoff from upgradient disturbed areas to the Pond 007, which is located at the southwest corner of the permit boundary. The City of Nucla has previously constructed the City's sewer line within the 100 -foot stream buffer zone. The C -18 (formerly East Ditch) was constructed close to the permit boundary in order to allow all drainage from disturbed areas to be intercepted and routed to Pond 007, to allow access around the south end of the pits and to maximize coal recovery. The stream buffer zone area within the permit boundary is approximately 0.4 acres of a very narrow strip of land approximately 860 feet long where Calamity Draw meanders close to the permit area. The drainage ditch will be designed to handle the runoff from a 10 -year, 24 -hour storm event and should preclude the potential of any water quality degradation in Calamity Draw as a result of these associated disturbances within the buffer zone. Because the anticipated operations will not result in disturbance of the main channel, there should be no impact to the quantity of streamflow in Calamity Draw from the buffer zone disturbance. After mining and related activities, the following reclamation plan for the area will be implemented to help insure the reestablishment of vegetation generally similar to that which occurs within the buffer zone. The areas within the buffer zone that may potentially be affected are dominated by the graminoid component of the Swale /drainage vegetation type (see Section 2.04.10). Nearly all of the dominant species that occur in this component are rhizomatous species capable of forming dense sods, while also reproducing from seed. These species, unfortunately, are not available from plant material Revised August 2010 (PR06) 2.05.6(3) -10