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• spectes. <br />An average of the herbaceous cover of the extended reference area types, weighted by their extent in <br />the pretnining azea to be affected by mine disturbance (in the II-W permit area including the South <br />Extension area), will be calculated as per the following formula using "all-hit" total herbaceous <br />vegetation cover data: <br />~,~y> 0.90 ((~~ (~~ + (Ab)(xb~ + (Aemb~ l"mob) + ~~)(Xs) ± ~~~ ~X»w~~ <br />when: <br />X,n. = Average all-hit total vegetation cover fox revegetated azea <br />A, = Aspen type percentage of the premitung surface Lo be affected by mining (11.0%) <br />Ay = Mountain Brash type percentage of the ptemitring surface to be affected by <br />mining (34.5%) <br />A,,,,b = Steep mountain brush type percentage of the pretnining surface to be affected <br /> by mining (12.8%) <br />A, = Sagebrush/Snowberry type percentage of the pretniuing surface to be affected <br />• by mining (31.3%) <br />A,,,~ = Western Wheatgrass/Alkali Sagebrush type percentage of the premising surface <br />• to be affected by mitring (10.4%) <br />& = Average reference area all hit total herbaceous cover -Aspen type <br />xn = Average reference area all bit total herbaceous cover -Mountain Brush type <br />x,°,n = Average reference azea all hit total herbaceous cover -Steep Mountain Brush <br />type <br />x, = Average reference area all hit total herbaceous cover -Sagebrush/Snowberry <br />type <br />ate, = Average reference azea all hit total herbaceous cover -Western Wheatgrass/ <br />Alkali Sagebrush type <br />For example, based on values typical of the five types for average years (based on monitoring), the <br />following data might be used: <br />L_J <br />47 <br />Revised 04/05 <br />