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multiplying by the percentage of the pre 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.) (xa) + (Ab)(Xb) + (A -b) (x—b) + (A.)(x.) + (A—) (X —)) <br />where: <br />X, = Average total herbaceous production for revegetated area <br />A. = Aspen type percentage of the pr eminin g surface to be affected by mining (11.0 %) <br />Ab = Mountain Brush type percentage of the pr eminin g surface to be affected by <br />mining (34.5 9 /6) <br />As,,,b = Steep mountain brush type percentage of the premining surface to be affected <br />by minin (12.8 0 /6) <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 />x = 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 />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 <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 />Revegetation success for production in reclaimed areas of the Tie-Across Road will be measured <br />t comparing the averaged herbaceous production froni either the low sagebrush or meadow; <br />reference area to the herbaceous production from the upland reclaimed areas or lowland /drainage <br />reclaimed areas, respectivelybaeeous- production will -be' estimated by clipping the annual above <br />C ground biomass from randomly located '/z m plots. Fencing or exclosures will be used to <br />e livestock prior to sampling as necessary. Production will be considered acceptable when the <br />4erbaceous production of the appropriate reclaimed area is not less than 90 percent of the herbaceous <br />, _production standard determined from -the corresponding ref <br />s _ p d <br />_ p � � g erence - areas with 90 percent statistical - <br />confidence The relationship of reclaimed areas to a particular reference area in the Tie- Across Haul <br />MR -66 49 Revised 10/09 <br />