Laserfiche WebLink
when the value of the reclaimed area is at least 90 percent of the herbaceous production <br />standard with 90 percent statistical confidence. The following weighted formula will be used <br />to evaluate revegetation success for herbaceous production: <br />xrev ? •90 fAsgl Ixsgl + fAmhl (x,,,hl + (Aal fxal + IA~,,,"„1(x"„wl <br />At <br />with 90 percent statistical confidence <br />where: <br />xrev =Average herbaceous production for revegetated area <br />Asg =Sagebrush type acreage, premining surface area <br />Amb = Mixed brush type acreage, premining surface area <br />Aa =Aspen type acreage, premining surface area <br />Aww = Western wheatgrass/alkali sagebrush type acreage, premining surface <br />area <br />xsg =Average reference area herbaceous production -sagebrush type <br />xmb =Average reference area herbaceous production -mixed brush type <br />xa =Average reference area herbaceous production -aspen type <br />xww =Average herbaceous production -western wheatgrass/alkali sagebrush <br />type <br />At =Total of relative community type acreages, premining surface area. <br />For the II-W South Extension area, the approach will be the same as for the II-W area except <br />that the steep mountain brush vegetation type will be included in the development of the <br />standard in proportion to its extent in the premining landscape. <br />xrev > •90 IAaI Ixal + IAmb) Ixmbl + (Asmbl (xsmbl + IAsgllxsgl + IAwwl Ixwwl) <br />At <br />With symbols used as specified above with the addition of <br />Asmb= Steep mountain brush type acreage, premining surface area <br />Xsmb =Average reference area herbaceous production -steep mountain brush type <br />Revegetation success for production in the reclaimed portions of Dry Creek will be evaluated by <br />comparing the premine baseline herbaceous production value for the Dry Creek mesic drainage <br />type to the herbaceous production in the revegetated portions of Dry Creek. The revegetated <br />area shall be considered acceptable if it is not less than 90 percent of the baseline production <br />value with 90 percent statistical confidence. This method of comparison will be used because <br />of the small areal extent of this type in the premining areas as described under cover. <br />42 Revised 1/99 <br />