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Wesr Elk Mine 1982 Dry Meadow Vegetation Community and Reference Area The dry meadow community occurs primarily on'the top of the level terraces. The most extensive meadow is located on the uppermost terrace. The meadows and the. area selected for the meadow reference area show evidence of discing, drilling and/or interseeding. Interpretation of aerial photographs indicate the large affected area meadow was probably modified by clear-cutting or bu]]dozing. As such, it should be recognized that these are artificially created communities. The dry meadow areas characteristically have very low shrub densities except on the mazgins of the communities where secondary growth and invasion by the oakbrush is evident..Dominant species of the .dry meadows aze primarily cool season perennial grasses, specifically westem wheatgrass (Agropyron smithii), smooth brome (Bromus inermis), and Kentucky bluegrass (Poo prarensis). Tota] vegetation cover for the affected area dry meadow community was 40.7 percent. About 71. - percent of that cover was contributed by western wheatgrass and smooth brome (Exhibit 32). Common forb species included morning-glory (Convolvulus arvensis), common houndstongue (Cynoglossum officinale), and curlycup gumweed (Grindelia squarrosa). -' ~• ri~~~_T~'Ha'l41.5f 24G.'.Y.43` Y`~'~ T l R?~. _ ,"Summary.YVegetationCommunity'Parameters, j~f980-19961.' ~,~ ~.-i'. ~ Sam le Size Mean IStd. Dev.) N~+e Total Vegetation Cover Percent Affected Areas Dry Meadow 1982 20 40.70 19.631 16 Oakbrush 1980 25 46.24 110.58) - ~ ~ 14 Oakbrush 1995 15 82.00 15.15) - 1 Oakbrush 1996 15 60.67 (4.25) 1 As en 7996 15 83.07 13.69) 1 Riparian 1996 15 84.1415.631 - 1 Reference Areas Dry Meadow 1982 20 - 46.85 (8.77) ~ 10 Oakbrush 1980 25 58.64 (14.331 16 Herbaceous Production ( /mz) Affected Areas D Meadow 1982 20 278.86 163.451 15 Oakbrush 1980 32 85.52 127.951 18 Oakbrush 1995 50 77.39 111.241 213 Oakbrush 1996 ~ 50 84.40 (42.021 70 As n 1996 50 96.66 132.65) 32 Ri arian 1996 50 90.02 151.291 - 91 Aeference Areas Dry Meatlow 1982 20 363.91 165.75) '9 Oakbrush 7980 40 86.23(28.01 28 Woody Plant Density - Affected Areas Oakbrush 19801#120mt1 25 156.8 135.711 14 Oakbrush 1995 1#150m~1 15 106.68 (25.91 21 ' Oakbrush 19961#150m'1 35 193.69 144.381 15 Aspen 1996 (#150m') 21 122.43 120.55) 8 Ri arian 19961#150m') 26 723.42 136.36) 25 Reference Areas Oakbrush 7980 35 106:7128.2f 19 Notes: 1. Sampte sizes were established by N,:,, or direction of CDMG. 2.04-147 Revised Apri12004 PR10