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<br />landmarks. <br /> <br />A minimum of 1~ cover and production samples will be taken, then sample <br />adequacy will be calculated using the formula: <br />Nm~~ <br />tZSz <br />~dx~z <br />Where: Nm;~ = The minimum number of observations needed <br />t'' = 1.64 for the 90% of confidence level <br />s' = Sample.variance <br />d =Precision (.10) <br />x = Sample mean <br />Sampling will continue until the required number of samples have been <br />collected to meet the requirements for a statistically adequate sample. Sampling <br />will terminate when the number of samples taken equals or exceeds Nm;~ . A <br />maximum of 50 samples will be collected on affected areas and 50 on the <br />reference area. <br />C. Comparisons between reclaimed and undisturbed areas, in order to demonstrate <br />that success criteria of 4.15.8, 4.15.9, or 4.15.10 have been met, will be based on <br />the following: <br />Cover: Vegetation cover will be restored on the disturbed azea to 90 percent of <br />the cover of the reference azea. <br />Production: Vegetation production will be restored on the disturbed area to 90% <br />of the production on the reference area. <br />Species Diversity: Establish a minimum of two perennial cool season grasses <br />and two perennial fortis. No single species will comprise more than 40 percent <br />relative cover, nor less than three percent relative cover on the revegetated area. <br />A perennial warm season grass component shall be established that is composed <br />of a combination of perennial warm season grasses with at least 6% relative <br />cover and no upper limit. <br />The Division proposes to approve the basis for this comparison. <br />13 <br />