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multiplying by the percentage of the premining surface area occupied by the type. These numbers will be <br />added to arrive at the overall weighted value. <br />X. >_ 0.90 ((Aa) (Xa) + (Ab)(Xb) + (Asmb) (Xsmb) + (As)(Xs) + (A--) (X—)) <br />where: <br />XL, = Average total herbaceous production for revegetated area <br />Aa = 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 />As = 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 />xs = Average reference area herbaceous production — Sagebrush/Snowberry type <br />x,,,,,, = 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 reclaimed <br />area is greater than or statistically indistinguishable from 90 percent of the herbaceous production <br />standard with 90 percent statistical confidence using a one - sample t -test. <br />PR -06 49 Revised 10/11 <br />