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4-39 `-' 4.5.1.5 Plant Species Collection and Identification • Plant species were collected throughout the 1980 and 1981 growing seasons. Species were identified by field ecologists conducting the study and confirmed by Dr. William A. Weber, Curator of the Herbarium, University of Colorado. Taxonomic nomenclature fol- ..lows Weber and Johnston (1979). Weber (1976), Nickerson et al. .(1976), and Beetle (1970) were consulted in an attempt to apply the most widely utilized common names. Primary selenium indi- cators were in accordance with WDEQ Guideline No. 2 as revised December, 1980. Noxious weed designations follow Thornton et al. (1974). Statements of origin follow Weber and Johnston (1979) and other sources. Voucher specimens have been preserved in a reference collection. 9.5.1.6 Species Diversity Species diversity was calculated for each vegetation type and the appropriate reference area by determining the number of species with a relative cover exceeding 3 percent and then grouping . these by lifeform. 4.5.1.7 Time of Sampling Vegetation cover, production, and density data were collected in July and August, 1980 for the Greasewood Shrubland vegetation type. All other quantitative data were collected in July and early August, 1981. 4.5.1.8 Agency Coordination On August 4, 1981, WRD ecologists met with Colorado Mined Land Reclamation (CMLR) personnel regarding the vegetation sampling requirements at the potential refuse disposal site. It was agreed that the pre-mining baseline vegetation data for cover, production, and woody plant density would be used as a revegetation success standard for the Shadscale Cheatgrass and Shadscale Wildrye vege- tation types. Therefore, reference areas were not required for these communities. Furthermore, it was agreed that the Juniper • Woodland and Gardner Saltbush vegetation types would be qualita- tively described. Limited quantitative data on cover and density,