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• Statistical adequacy requirements For production were cal- <br />culated using the formula in Section 2.3.1, except that mean production <br />and variance were used in place of mean cover and variance. <br />2.4 PLANT SPECIES COLLECTION AND IDENTIFICATION <br />Plant species were collected throughout the 1981 growing season. <br />Species were identified Dy Field ecologists conducting the study and <br />confirmed by Or. William A. Weber, Curator of the Herbarium, University <br />of Colorado. Taxonomic nomenclature lollows Weber and Johnston (19791. <br />Nickerson of al. !19761 and Beetle 119701 were consulted in en attempt <br />to apply the most widely utilized common names. Primary selenium <br />indicators ere in accordance with WDEQ Guideline No. 2 as revised March <br />1980. Noxious weed designators follow Thornton et al. 119741. State- <br />ments of origin follow Weber and Johnston 119791. Voucher specimens <br />have been preserved in a reference collection. <br />2.5 SPECIES DIVERSITY <br />The diversity lequitabilityl index was determined using the formula <br />• -~ \tJ'/ log ~N1~ <br />where ni equols the absolute cover value (or each species encountered <br />in a community and N equals the total absolute vegetation cover in a <br />Community IWhiftaker 19751. <br />2.6 TIME OF SA/MLING <br />Vegetation cover and production data were collected in July 1981 <br />and density work started in July and finished in August 1981. <br />2.7 AGENCY COORDINATION <br />On 24 June 1981, Nr. Glenn Sides of U.S. Steel and Mr. David Johnson <br />of Western Resource Development, consultant to U.S. Steel, met with Mr. <br />Tom Gillis and Mr. Jim Herron of CMLR to define the vegetation sampling <br />requirements for the Somerset Mine. On 1 July 1981, Mr. Johnson met with <br />Mr. Gillis at the Somerset Mine to resolve additional details of the <br />proposed study. <br />The sampling program defined in Section 2.0, Methods, is the study <br />plan recommenced and approved by Messers Gillis and Herron. <br />-4- <br />