2008-09-29_PERMIT FILE - C1981019A (13)

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RULE 4 PERFORMANCE STANDARDS ratio, selenium, and boron. To further encourage shrubs growth, the seed mix was heavily weighted toward shrubs. The seed mixture that was used on the test plots is shown below. Seed Mix - Buried Topsoil Test Plot Seed Mix - Colowyo Mine - 2006 ecommen seeds Species Synonym Common Name Seeds/ lb. lbs. / acre sq. foot Agropyron dasystachyum Elymus lanceolatus ssp. lanceolatus Thickspike Wheatgrass 154,000 0.25 0.88 Agropymnsmithil Pascopyrumsmithil Western Wheatgrass 110,000 0.25 0.63 .E Agropyron spicatum inerme Pseudomegneria spicata ssp. inerme Beardless Bluebunch Wheatgrass 117,000 0.50 1.34 Agropyrontrachycaulum ElymustrrachyraWusssp.trachyraulus Slender Wheatgrass 159,000 0.50 1.83 Pod Ampla Big Bluegrass 882,000 0.10 2.02 Subtotal = 1.60 6.71 ' Achillea millifolium Western Yarrow 2,770,000 0.10 6.3 N Artemisia ludoildana Louisiana Sagewort 33,600 000 2 668 0.75 10 0 0.58 12 6 v Aster chilensis ?irgulasterascendens Pacific Aster , , . . Unum lewisii Lewis Flax 293,000 0.20 1.35 m Artemisia fridgida Fringed Sage 4,536,000 0.05 5.21 Penstemon strictus Rocky Mountain Penstemon 592,000 0.20 2.72 Subtotal = 1.40 22.33 Amelanchieralnifolia Saskatoon Serviceberry 25,800 1.50 0.89 Artemisa tridentata uaseyana Mountain Big Sagebrush 2,500,000 0.25 14.35 Artemisia cana Silver Sagebrush 850,000 0.75 14.63 Afriplexcanescens Fourwing Saltbush 52,000 1.00 1.19 Ceratoideslanata Wiinterfat 56,700 2.00 2.60 Chrysothamnus nauseosus Rubber Rabbitbrush 400,000 0.50 4.59 m Purshia Utdentata Bitterbrush 15,000 3.00 1.03 Rosa woodsii wood's Rose 45,300 1.50 1.56 Symphoricarpos rotundifohius Mountain Snowberry 75,000 1.50 2.58 _ Subtotal = 12.00 43.44 Total 15.00 72.48 At the peak of each subsequent growing season, or shortly thereafter, for a period of at least 5 years, these test plots will be evaluated for emergent shrub density, ground cover by species, and a visual evaluation of surficial erosion. This data will be reported annually in the Annual Reclamation Report. If data shows that there is promise as a shrub conducive reclamation procedure, CDRMS may be contacted to initiate alternate reclamation procedures for the remainder of Colowyo reclamation. 4 15 7 Determining Reve2etation Success: General Requirements and Standards During the summer of 1980, two reference areas were selected to represent the two major vegetative communities to be disturbed, sagebrush and mountain shrub. The location of the reference areas are shown on the Vegetation map (Map 4) and Regional Vegetation map (Map 3). Extensive, detailed vegetative sampling was performed, duplicating the methodologies as described in Section 2.04.10. The reference areas were sampled for herbaceous cover, herbaceous productivity and woody plant density. Species diversity was determined utilizing herbaceous cover data from the premining inventory of the sagebrush and mountain shrub communities. The reference areas are approximately seven acres in size. Statistical tests were performed on the vegetative data from the reference areas to prove that they were comparable to the premined area. The parameters compared were herbaceous cover and herbaceous production. Sample size adequacy tests were performed on both the premine and reference area data to insure that representative cover and production data had been obtained at the 80% level of confidence. Rule 4 Performance Standards 4.15-7 Revision Date: 6/23/08 Revision No.: MR-91