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• The surface water monitorwill be maintained for the life of the mining operation or until such a time <br />as CDMG may agree that they are no longer necessary. The surface water monitoring installation <br />will be removed upon completion of the postmining phase of the Hydrologic Monitoring Program. <br />All surface water data collected at each monitoring site in each future water year will be compiled <br />and submitted to the CDMG in the form of the New Horizon Annual Hydrology Report (AHR) within <br />three months afferthe end of each water year. Future AHRs will include copies of quarterly NPDES <br />discharge monitoring reports for each NPDES monitoring site submitted to the Colorado <br />Department of Health during the same water year. <br />Stream Buffer Zones <br />The stream buffer zone along Calamity Draw (land within 100 feet of a perennial stream or stream <br />with a biological community as defined by Section 4.05.18(3) of the CDMG regulations) will be <br />affected by associated disturbance activities within the New Horizon 2 area (see Map 2.05.3-1 ). <br />The mining and operations plan for New Horizon 2 has been developed so that there will be nc <br />disturbance to the main channel of Calamity Draw. Disturbance within the buffer zone will be <br />limited and consist of activities related to the construction of a drainage ditch (East Ditch) to convey <br />runoff from upgradient disturbed areas to the Pond 007, which is located at the southwest corner <br />• of the permit boundary. The City of Nucla has previously constructed the City's sewer line within <br />the 100-foot stream buffer zone. The 007 East Ditch was constructed close to the permit boundary <br />in order to allow all drainage from disturbed areas to be intercepted and routed to Pond 007, to <br />allow access around the south end of the pits and to maximize coal recovery. The stream buffer <br />zone area within the permit boundary is approximately 0.4 acres of a very narrow strip of land <br />approximately 860 feet long where Calamity Draw meanders close to the permit area. The drainage <br />ditch will be designed to handle the runofffrom a 10-year, 24-hour storm event and should preclude <br />the potential of any water quality degradation in Calamity Draw as a result of these associated <br />disturbances within the buffer zone. Because the anticipated operations will not result in <br />disturbance of the main channel, there should be no impact to the quantity of streamflow in <br />Calamity Draw from the buffer zone disturbance. <br />After mining and related activities, the following reclamation plan for the area will be implemented <br />to help insure the reestablishment of vegetation generally similar to that which occurs within the <br />buffer zone. <br />The areas within the buffer zone that may potentially be affected are dominated by the graminoid <br />component ofthe swale/drainage vegetation type (see Section 2.04.10). Nearly all of the dominan! <br />species that occur in this component are rhizomatous species capable offorming dense sods, while <br />• (REVISED 6/01) 2. 0 5. 6 (3) - 8 <br />