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At least 75% of the relative production will consist of seeded species or species of <br />comparable quality as livestock forage. State listed noxious weed species and all annual <br />and biennial plants will not be counted toward the revegetation success standard for cover <br />or production in any reclaimed or reference area. <br />Sample adequacy will be tested during field sampling using the formula in DRMS Regulation <br />4.15.11(2)(a), as follows: <br />t2s2 <br />nm = (CN)2 <br />where: <br />n,,, = minimum sample size <br />S 2 = Sample variance (n-1 degrees of freedom) <br />d = Precision (0.10 for cover and production; 0.15 for woody <br />plant density) <br />x = Sample arithmetic mean <br />t = The (a= A0) t -table value for a 1 tail t-test, n-1 degrees of <br />freedom (infinite degrees of freedom may be used if n > 30) <br />n = Sample size <br />During field sampling for cover and production, at least 15 samples for cover and 30 samples for <br />production will be collected at each site. Sampling may continue if necessary to reach sample <br />adequacy, or sampling may be terminated before sample adequacy is reached if an alternative <br />statistical method (approved by DRMS) can be used that does not require demonstration of <br />sample adequacy. Alternative procedures will require a minimum of 30 samples, as detailed <br />below. Because oven dry weight production data will not be available until samples are dried in <br />the laboratory, sample adequacy may initially be calculated on fresh weights of clipped material. <br />Reclaimed area cover and production will be compared to a standard equal to the mean values <br />measured at the reference area by sampling, as described below. Revegetation will be considered <br />"successful" if the mean value for the reclaimed site can be demonstrated to equal or exceed "Q" <br />(Q=90% of the standard). One of the following three methods will be used to compare mean <br />values at reclaimed sites to Q, depending on the mean values and whether sample adequacy was <br />reached during sampling. <br />1) If sample adequacy exists at the reclaimed site and the reference area, and the reclaimed site <br />mean is equal to or greater than Q, no statistical comparison is necessary and revegetation at the <br />Page 46 May 2016 (TR -75) <br />