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4-97 <br />species richness = s/log N, <br />where S equals the number of species in a sample and N <br />equals the total number of individuals (transects) in a <br />sample (Whittaker 1975). Equitability indices were determined <br />for each community using the formula: <br />-~(„),o~~N) <br />where nl equals the cover value for each species encountered <br />in a community and N equals the total vegetation cover in a <br />community. <br />4.8.7 Time of Sampling <br />Vegetation cover data was collected in July 1980, production <br />• plots clipped in July and August 1980, and density data collected <br />in July, August, and September 1980. <br />4.8.8 Agency Coordination <br />A plant ecologist from Western Resource Development met with <br />OSM and CMLR personnel in a joint meeting on 7 July 1980 to <br />develop plans for the establishment of reference areas at the <br />Munger Canyon Mine as required by the Colorado Surface Coal <br />Mining Reclamation Act. <br />All aspects of the program including the quantitative sampling <br />procedures were presented and discussed. Agency personnel were <br />in concurrence with all details of the program. Furthermore, it <br />was concluded that one set of reference areas could be used for <br />