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• Total Live Vegetation Cover equal to or greater than thirty (30) percent.
<br />• Total Herbaceous Production (annual) equal to or greater than 300 pounds per acre
<br />-(dry weight}.
<br />• Species Composition comprising three (3) cool season perennial graminoids and one
<br />(1) perennial forb, with no qualifying single species accounting for more than forty
<br />(40) or less than one (1) percent relative cover.
<br />• There will be no woody plant density revegetation success criterion in accordance
<br />with .the -post-mining land use .and landowner wishes.
<br />Sampling Methodology
<br />Any CDMG approved sampling methodology may be employed to determine the levels of
<br />cover, production, and composition on the revegetated areas. If a methodology is
<br />proposed that has not been previously employed or accepted by CDMG, such
<br />methodology will be submitted for approval .prior to employment.
<br />Determination of revegetation success in achieving the total vegetation cover and
<br />total herbaceous production success criteria will be based on quantitative statistical
<br />means. The .Student's t test is a robust statistical test to evaluate the equiv~.lency of
<br />two sample means or a sample mean with a specified standard (Zar, 1974). This test
<br />will be employed to test the null hypothesis that the sample mean for revegetated
<br />parcel parameter is .equal to or -greater than 90 .percent of .the cover or production
<br />success criterion. Standard statistical probability ranges will be employed in the
<br />determination of whether the revegetated area mean is significantly less than the
<br />criterion. When the revegetated area -mean is not statistically signif cantly less than
<br />the applicable criterion at a 90 percent confidence level employing a 10 percent
<br />alpha error probability level, the revegetation will have been demonstrated
<br />successful.
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<br />National King Coal, LLC King I Mine
<br />Section 2.05.4
<br />Page 8 February, 2007
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