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These grasses have proven to do well in the dry medium elevation environment of western <br />Colorado. They will prevent erosion and do provide forage and cover for animals. Certified weed <br />free hay or straw mulch will also be applied at the rate of 2000 lbs /acre. The mulch will be <br />crimped into the ground to provide soil stabilization. <br />6. Post - Reclamation Site Drainage <br />The site will contain a 100 year 24 hour event event. Once Mining Area 5 is removed, the <br />unreclaimed portions of the site would again be vulnerable to erosion. For this reason, the <br />outside edge of the perimeter of the site will have an 18 inch high berm of approximately 6H:1V <br />slope left in place to ensure that no disturbed area runoff leaves the site in the final reclamation <br />stage. <br />This stormwater containment berm will hold back the water producing a shallow pool. This pool <br />will quickly dissipate into the pit floor. No drainages enter the site, meaning a diversion ditch <br />will not be needed. A small area in relation to the total mining area (the southwest portion) will <br />be allowed to drain into the reclaimed area, but the size of the pit floor will be able to allow <br />infiltration. Stormwater will sheet flow down the side slopes (3H:1V) across the pit floor and <br />pool behind the stormwater berm. This berm will be left in place due to its shallow slopes and <br />minimal height. It will be seeded and mulched at the time that the various segments on Mining <br />Area 5 are excavated. <br />The sediment ponds will be constructed less than 10' above the natural surface, therefore the <br />Office of the State Engineer does not need to be notified. This pit will be operated above the <br />water table and water to be used for dust suppression will be supplied from Irrigation water <br />rights. A stormwater discharge permit will be obtained during mining operations but will not be <br />needed after reclamation. The sediment ponds will be left for stock use and wildlife use, since <br />there is almost no water on the terrace during the entire year. <br />7. Revegetation Success Criteria <br />Revegetation will be deemed adequate when erosion is controlled, and the vegetation cover is <br />similar to the existing cover, and is considered satisfactory according to Division standards. No <br />shrub standard is proposed for the reclamation success criteria. <br />Uncompahgre Pit, February 2013 E -4 <br />