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• 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 />tc = (Q-xy(Sx) <br />Where: <br />~ =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 ~ 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 revegetaGon <br />is deemed successful for the parameter tested. <br />Determination of revegetaGon success on reclaimed <br />IndustriaVCommercial postmine land use areas, not designated as "Active <br />Areas° or "Steep Rock Face` as depicted on Exhibit 6C-A and Figure 14- <br />14, will be based on qualitative assessment of `ground cover sufficient to <br />control erosion°, pursuant to Rule 4.15.10(2). <br />PR-3 <br />14-23 <br />(Revived 4/25/07) <br />