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3) A random number generator such as the one provided in the QuattroPro Spreadsheet <br />Program, will be run using the total number of sample blocks determined in Step 1 and the <br />number of sample points required from Step 2 of this procedure. <br />4) All randomly selected sample blocks from step 3, will be located in the field by standard <br />surveying methods. After the 5o x 50 foot sample block is field staked, a 3 foot x 3 foot <br />sample grid square will be tossed over the back of the samplers head to determine the final <br />sample grid to be cut and collected. The vegetation within the 3 x 3 foot sample grid will be <br />clipped as close to the ground as practical and gathered and air dried for 96 hours to <br />simulate field hay drying, before it is weighed and the yield per acre is calculated. The <br />results from all 3 x 3 foot sample points will be mathematically averaged. <br />5) The data will be evaluated for sampling adequacy using the following formula: <br />Nmin = [(ta + tp)2 * (s2)l/(dQ)2 <br />where: <br />Nmin = minimum numberofsamplinggrids toachieve sampling adequacy. <br />s = sample standard deviation <br />Q = 90% of technical standard <br />to = the (a=.10) t table value for a single tailed West with (n-1) degrees <br />of freedom <br />= the (= .25) t table value for a single tailed t-test <br />d = desired level of reduction about the sample mean (0.90% <br />confidence) <br />6) WFC would like to reserve the option to measure vegetation production by the old fashion <br />method, which is, cut, bale, weigh and count bales. <br />Acceptable production will be achieved when the production value determined for the appropriate <br />irrigated hayland reclaimed areas is not less than 90 percent of the 1.84 tons per acre with 90 <br />percent statistical confidence. <br />Irrigated Pasture T e. The revegetation success standards for this type are based. on the <br />establishment of irrigated pasture as the postmining land use. Irrigated pasture should be able to <br />(Revised 1-15-03) 2.05.4(2)(e) - 18