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GREYSTONE ~ 3037214248 06123!00 13:55 ~ :04/06 N0:423 <br />I <br />Kent Gorham <br />June 23, 2000 <br />Page 3 <br />Where: <br />N = required number of transects or quadrats <br />d = desiredlevelofprecision(U.Ithelevelofprecisionforestimateot'thc <br />Mean to be within 1 U% of the actual mean) <br />z sample mean <br />s= = sample variance <br />t = the o = .10 l-table value for a single tailed t-test with n-1 degrees of <br />freedom <br />Herbaceous Production Sampling <br />Herbaceous production on the two reclaimed areas and the Pasture Reference Arca will he <br />determined by hand clipping three 0.5 square meter yuadrats along each randomly located poittt- <br />intercepttransect. Plotswillbeplaccdtothetightsideofineter-ntarksB,lS,and32. The vegetation <br />will be clipped by life forth and the single species alfalfa (Me~ticago saliva). The life form <br />categories include perennial grass, annual grass, perennial forb, and undesirable perennial forb. <br />Clipped vegetation will be sepazated and weighed to the nearest 0.1 gram with the corresponding <br />'w+et" weight recorded. The clipped vegetation will be oven dried and re-weighed as a field "dry" <br />weight. The dry weights will be converted to pounds per acre for each sampled urea. The three <br />production plots clipped along each transect will be averaged into a production value per transect <br />before being evaluated for success comparison and statistical evaluation purposes. Productivity on <br />the two reclaimed areas will be considered successful i f the sample mean is at least 90 percent of the <br />productivitysatnplemeanmeasuredonlhePastureRefercnccArea. Fifleentransectswillbeinitially <br />evaluated for success compazison and statistical evaluation purposes. The Snedecor-Cochran sample <br />adequacy formula (Equation 2) will be utilized to determine that an adequate number of samples <br />are collected. <br />Pont Mining Succeaa Demonatratlon <br />Post mining demonstration of revegetation success for vegetative cover and herbaceous production <br />within the reclaimed azeas will be determined through use of the Otre-Sample T-Test (Equatioe 3). <br />This statistical test is used only when the reclaimed area sample mean is less than 90 percent of the <br />reference area mean value. <br />