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<br />(a) For herbaceous vegetation, productivity shall be at least • <br />902 of the productivity as determined from the reference area with <br />902 statistical confu]enw. Prcxluctivity shall be measured as <br />~~ current year above-ground bicrtiass of herbaceous vegetation (4.1s.6). <br />The density of wrxxly plants on the revcyetatecl area shall be <br />cJmsidercrl acct{,Cnhle if it is at ]cast 902 of Una approved reference <br />area with 802 st<~tistiwl rnnfidcnce. A lesser density would <br />better achieve the goals of the approved post mining land use. For <br />the purposes of 4.15.8, density is the number of sterns per unit <br />area and is defined in terms of countable trees and shrubs. A count- <br />able tree or shrub means a woody plant that can be used in the <br />calculation of density under the criteria listed in 4.15.8(7). <br />Post mining density is compared directly to premining affected <br />area density. <br />xz - x + z a sX2 + sX1 > 0 <br />xz = cover, density, or productivity on reclaimed area* <br />x =value which must be reached to demonstrate land has been <br />reclaimed* <br />z.B = z statistic = 0.84 <br />sxZ = variance of xz* <br />z <br />Terminology <br />Affected Area <br />Premining <br />Control Area <br />x~ = percent cover or productivity y, = percent cover or productivity <br />(9m/m2) (9m/m2) <br />sX~ = variance of mean sy~ = variance of mean <br />Post tdining <br />