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whem 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 />~ <br />• <br />. ~ ~ ~to. evaluate revegetation success foe herbaceous production:. ~ _ ~ <br />xrev ? ..90 IAsgl Ixs0. + IAmhl.lxmhl + IAaI Ixal +' IAw,,,~llxwwl ~. - <br /> <br />with 90 percent statistical confidence ~ ~ ~ ~ ~ , <br /> <br />' ~ ~ xrev ~ =Average herbaceous production for revegetated"area ~ ~ ~ ~~ ~ ~ ~ ~. <br />_ ~ ~'0'sg ,` =Sagebrush type acreage, premining swface area ~ ~ . <br />" •Amb~ ~= Mixed brush type acreage, premining surface area <br />~ <br />~ =Aspen type acreage, premining surface area ~ ~ - ~ r <br />" ~ 'Qa <br />Aww, Western wheatgrasslalkali sagebrush type,acresge, 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 = Ayerage reference area herbaceous production -aspen type " . ~' <br />xww' =Average herbaceous production -western wheatgrasslalkali sagebrush, <br />- ~ ~ ~ tYPe . ~ .. <br />• ~ '~'t ~, .= 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 exterit.in the premining, landscape.. <br />xrev ~ •90' IAa) Ixal + IAmbl Ixmbl +' IAsmbl Ixsmb) + IAsgllxsg) + (Awwl Ixwwl) <br /> <br />' With symbols used as specified above with the addition of ~ ~ ~ ..' <br />" . As"mb= 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 4he~reclaimed portions of~Dry Creek will be"evaluated '- <br />,by comparingthe premine baseline herbacepus production valuefor the Dry Creek'mesic <br />,~ ~ drainage ;type tothe.herbaceous production in the revegetated'por;ions of Dry Creek.'. The, ~ . <br />." ~ ~revegetated area shall. be considered acceptable if it~is not.less than 90 percent of.the baseline. ~ ~. <br />production value with 90 percent statistical confidence. This method of comparison will be <br />" ~ "~ used because of the small areal extent of this type in the premining areas as.described under <br />~ .. <br />• <br />" cover. .. <br />" ~ .r 42 ~ ~ ,Revised 1/99 i <br />