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• <br />• <br />L_J <br />During field sampling for cover and production, at least 15 samples (observational units) will be <br />made at each site. Sample adequacy will be tested after 15 samples are taken, using a field <br />laptop computer. Sampling may continue if necessary to reach sample adequacy, or sampling <br />may be terminated before sample adequacy is reached if an alternative statistical method <br />(approved by DRMS) can be used that does note require demonstration of sample adequacy. <br />Alternative procedures will require a minimum of 30 samples, as detailed below. Because dry- <br />weight production data will not be available until samples are dried, sample adequacy will initially <br />be calculated on fresh weights of clipped material, then recalculated later for air -dried material and <br />additional field samples will be taken if necessary. <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 <br />considered "successful' if the mean value for the reclaimed site can be demonstrated to equal or <br />exceed "Q" (Q =90% of the standard). One of the following four methods will be used to compare <br />mean values at reclaimed sites to Q, depending on the mean values and whether sample <br />adequacy was 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 />reclaimed site will be deemed successful for the parameter in question. This complies with the <br />provisions of DRMS Regulation 4.15.11(2)(a). <br />2) If sample adequacy exists at the reclaimed site and the reference area, and the mean value at <br />the reclaimed site is less than Q, a "standard null' one -sided t-test with alpha error probability of <br />0.10 will be used, in conformance with DRMS Regulation 4.15.11(2)(b), using the general form <br />of the one -sided t -test as follows: <br />(Revised: PR -06) <br />2.05.4(2)(e) - 33 <br />