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• <br />• Woody Plant Density -The reclaimed area population mean is <br />not less than 800 stems per acre. <br />If the parameter sample mean for the bond release is equal to or greater <br />than 90 percent of the reference area value, revegetation is considered <br />successful for the parameter. If the parameter sample mean for the bond <br />release area is less than 90 percent of the reference area value, one <br />sample T-test will be employed. The one sample T-test is as follows: <br /> <br />Where: <br />tc =Minimum number of samples required <br />Q = 90% of reference area value <br />x =Sample mean for bond release area <br />Sx =Standard error of the mean (S/n) <br />S =Sample standard deviation <br />n =Sample size <br />If tc is less than or equal to the 1-tailed t-table value for alpha error <br />probability of .10 at the appropriate degrees of freedom, then revegetation <br />is deemed successful for the parameter tested. <br />Determination of revegetation success on reclaimed <br />Industrial/Commercial postmine land use areas, not designated as "Active <br />Areas" or "Steep Rock Face" as depicted on Exhibits 6C-A, 11C, 10C or <br />Figure 14-14, will be based on qualitative assessment of "ground cover <br />sufficient to control erosion", pursuant to Rule 4.15.10(2). <br />• <br />PR-4 14-23 (Rev 07/07) <br />