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formula below) by taking the herbaceous production value for each reference area type and <br />• multiplying by the percentage of the premining surface area occupied by the type. These numbers will <br />be added to arrive at the overall weighted value. <br />X— Z 0.90 ((A.) ( + ( A b)( X b) + (A..b) (Xsmb) + ( AB)(X.) + (A.) (X. <br />where. <br />X. v = Average total herbaceous production for revegetated area <br />A. = Aspen type percentage of the premining surface to be affected by mining (11.0 %) <br />Ab = Mountain Brush type percentage of the premining surface to be affected by <br />mining (34.5 %) <br />Asmb = Steep mountain brush type percentage of the premining surface to be affected <br />by mining (12.8 %) <br />A, = Sagebrush /Snowberry type percentage of the premining surface to be affected <br />by mining (31.3 %) <br />A,,, = Western Wheatgrass /Alkali Sagebrush type percentage of the premining surface to be <br />affected by mining (10.4 %) <br />xa = Average reference area herbaceous production - Aspen type <br />• xb = Average reference area herbaceous production — Mountain Brush type <br />xsmb = Average reference area herbaceous production — Steep Mountain Brush type <br />x = Average reference area herbaceous production — Sagebrush /Snowberry type <br />xaa. = Average reference area herbaceous production - Western Wheatgrass /Alkali <br />Sagebrush type <br />Reclamation success for herbaceous production shall be demonstrated when the value of the <br />reclaimed area is greater than or statistically indistinguishable from 90 percent of the herbaceous <br />production standard with 90 percent statistical confidence using a one - sample t -test. <br />Species Diversity <br />Since the time that the diversity standards for the original II -W permit and the South Extension <br />Area were proposed, a more comprehensive consideration of the nature of plant diversity on <br />reclaimed areas as compared to un -mined areas (reference areas) has been completed. The <br />result is the set of proposed standards below: <br />u <br />TR -65 49 Revised 9/09 <br />