2008-02-04_PERMIT FILE - C1982056A

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• Baca Winter Wheat Alfalfa 10.0 0 5 . 1980 Mixture (#3) Revenue Slender Wheatgrass 2.0 Oahe Intermediate Wheatgrass IS Luna Pubescent Wheatgrass ].5 Lincoln Smooth Brome 2.0 Nordan Desert Wheatgrass 0.25 Sodar Streambank ~'V'heatgrass 0.25 Great Basin Wildrye 0.25 Orchardgrass 0.125 "I-i m oth v 0.05 Kentucky Bluegrass 0.02 Durar Hard Fescue 0.125 Barton Western Wheatgrass 0.25 Lutana Cicer Milkvetch OS Emerald Crownvetch 0.5 Arrowleaf Balsamroot 0.01 Small Burnet 0.5 Sweetanise 0.5 Alfalfa 0.25 Mountain Big Sagebrush 0.025 Antelope Bitterbrush 0.25 • Lanceleaf Bitterbrush 0.25 Planned disturbance to this community by surface facilities will be vertical boreholes which will be used [o dewater the underground mine, a chemical mixing station, a settling pond, and a short access road . Total disturbance will he about 4.6 acres. A permanent access road already exists for 6300 feet towards the site. .Another 2500 fee[ of access road will be construc ted through this vegetation type. The Reclaimed Pasture Vegetation Type itself occupies 11.0 percent of the proposed permit area. As identitied on Table 32, Reclaimed Pasture Vegetation type, smooth brome (Bromus inennis) and alfalfa (Medicaeo saliva) dominate the community with 22.3% and 57.7% gromtd cover and 186.75 g/nt2 and 230.46 g/m2 productivity, respectively. Other significant species include intermediate Wheatgrass (A~rODyf0^ intennedium) and yellow sweetclover (Melilotus officinalis) with 8.5% and 1.2% ground cover, respectively. Total herbaceous stratum variables average 30.90% ground cover by grass and 59.00% ground cover by forbs, 258.73 g/m2 (2,308 Ibs/acre) production by grasses and 230.46 g/m2 (2,056 Ibs/acre) production by forbs. The reclaimed pasture's overall variables are 89.90% vegetative cover and 489.19 g/m2 (4,364 Ibs/acre) production. The diversity index as calculated by Shannon et al. (1973) for [he entire community gives a value of 0.4023. Reclaimed Pasture Vegetation Type variables as presented above were determined from statistically adequate sampling. Sample parameters for each variable, and the minimum sample size required for an adequate sample are presented in Table 27, Summary of Statis[icallnfonna[ion. A reference area already has been established for this vegetation type under CYCC's Permit No. 79-177. l[ is shown as R2, Pasture Reference Area, on Map 18, Premising Vegetation. Prior to surface mining, this area supported a pasture vegetation type. The reference area • for this site was established in 1980 and will continue [o be used to measure revegetation success on pastureland by both Cl'CC and TCC. Responsibility for the protection and management of [his reference area will continue under CYCC and TCC as required by Slate and Federal regulations. M R 97-154 2.04-57 Revised 10/02/97