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x2 - x + z.l /sX2 + s_z > 0 <br />~/ 2 x <br /> <br /> <br />Where x2 = cover or productivity on reclaimed area (from previous <br />section), <br />n <br />x value which must be reached to demonstrate land has been <br />reclaimed (see previous section), <br />z 1 = z statistic = 1.28, <br />s_2 variance of x2 (from previous section), <br />x2 <br />s„2 = estimated variance of x calculated as follows: <br />X <br />-2 <br />xl <br />sn2 s 2 ~- y2 sr + s_2 sr <br />y2 y2 y2 <br />1 <br />_2 s 2 s 2 <br />2 Xl + xl + yl <br />Where s = <br />r -2 -2 -2 <br />yl XI yl ~ <br />An HP-25 program for calculating sn2 is available on request. <br />x <br />n <br />Note: If x > x, the above inequality is met and the lengthy variance <br />calculations are unnecessary. <br />Evaluation of Species Composition <br />When requesting bond release, provide a discussion evaluating species <br />composition with respect to the postmining land use and the approved seed <br />mixture. In some cases, improved species composition can be substituted for <br />part of the productivity requirement. <br />Note: Cropland will be compared directly to a cropland reference area as <br />well as to premining cropland data. <br />PR-67 <br />0130.0.0 <br />10/22/86 <br />-9- <br />