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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 maybe 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 equivalency of <br />two sample means or a sample mean with a specified standazd (Zaz, 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 significantly 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. <br />National King Coal, LLC King I Mine <br />Section 2.05.4 <br />Page 8 March, 2006 <br />