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I ,~ <br />Reclaimed Area <br />Control Area <br />xZ = percent cover or productivity yz = percent cover or productivity <br />(9m/mz) (9m/m2) <br />sXi = variance of mean syz = variance of mean , <br />NOTE: Variance of mean = Exit- (E xi)Z/n <br />n n-I <br />x = value which must be at least equalled to demonstrate that land has been <br />reclaimed <br />x = __Y.z_x i <br />Y~ <br />i <br />I <br />Explanatory Note: If the value for the premining control dyl) <br />equals the value for the post mining control (y2), then x equals <br />' the value for the premining affected area (xl). In this case, <br />the value for the reclaimed area (x2) is compared directly with <br />~ the value for the premining affected area (x1 ). If the value for <br />the premining affected area is 80 percent of the value for the pre- <br />mining control area, then the value for the recalimed area should be at <br />1 least 80 percent of the value for the post mining control area if the <br />reclamation goal is to be met. This simple proportion is used to try to <br />account for differences between years. <br />1 <br />sXZ= estimated variance of x calculated as follows: <br />xZ ` /// 1 ' ` xZ CSx2 syz` <br />sxZ.p 2sY~Gi[y~sr~a(~Sy2sr~`; where, srx_ ~ i + ~1+ <br />i 1 ` 1~ / xx zx yz <br />~ ~ > > ~ <br />NOTE: If x > x, the above inequality is met and the lengthy variance cal- <br />~ culations are unnecessary. <br />i <br /> <br />