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1. Of the three principal cool season grass species, no single species • should comprise greater than 40% of the relative importance of this component (cool season grasses). OE the two shrub species, neither should comprise greater than 80% of the relative importance of this component (shrubs). That is; iE cool season grasses comprise 30% of the total diversity on the reclaimed surface, then none of the three principal cool season grasses should account for more than 40% of the total diversity for cool season grasses (or 12% of total diversity). 2. Diversity calculations will be based on relative cover values by species, obtained during the sampling program during the liability period. Sufficient numbers of samples shall be taken to insure that the requirements of sample adequacy are met. Shrub Density Wyoming Fuel has analyzed the structure and numbers of woody plants in the pre-mining communities at the Canadian Strip. It was concluded that there is a high mortality amoung young woody plants and that it is only the mature plants which are contributory to a caell developed community. For these reasons Wyoming Fuels has proposed a standard of 3,770 stems/acre + 1,700. The Division feels that the 3,770 stems/acre is a reasonable standard based upon the background information submitted, with the following clarifications. 1. The base standard for woody plant density reestablishment shall be • 3,700 live woody plant stems/acre. lJyoming Fuel will reestablish woody plant densities to at lease 90% of this standard with 80% confidence. 2, Woody plant density data will be collected during the sampling program during the liability period. If you have any questions please feel free to call. Sincerely, ,~rGLu.O s 5..., Piichael S. Savage Reclamation Specialist MS:ep cc: E. Bischoff R. Domingue