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PLAN FIR DEfERMINICIG 'IHE SUCCFSSFULNESS OF REUF]GETAaPION <br />• The criteria for determining success of revegetation on reclaimed lands has been <br />modified in ca[~liar~oe with OSM special stipulations aryl the State Program Permit <br />Submission,as noted in the Midterm Review. Zhe modifications include the <br />statistical met2wdology far oca~aring cover aryl production of reference areas and <br />reclaimed areas. It also includes the shrub density aryl species diversity <br />sYa.,rtwrrt for rangeland. <br />• <br />In summary and in accordance with Rule 4.15.8, revegetation of reclaimed sites <br />will be deemed successful when ~a~~*~~*+ts of reclaimed herbaceous cover aryl <br />productivity are at least 90 percent of the cover and p~r~oductivity values for the <br />reference area with 9o pennant statistical confidence. If herbaceous cover and <br />productivity on the revegetated areas are determined to be less than the <br />reference areas, acne-tailed "t" test will be performed to determine if there <br />is a statistically significant difference. Based on this test, revegetation will <br />be deemed successful when the calculated "t" is less than ar equal to the "t" <br />value fran the one-tailed "t" distribution table (see August 9, 1980 response to <br />OSM stipulation ,~9). <br />The following formula far the one-tailed "t" test was obtained frcan page 13 of <br />Statistical Evaluation of Revegetation SUOCess on Goal Iands in the West, L.L. <br />Larson, OShI-Region V, Fetmuary 26, 1980: <br />t = X1-X2 <br />e <br />sl= + s2a <br />nl n 2 <br />• <br />Where: <br />to = calculated estimate of t value <br />X1 = mean for reference area data (cover ar production) <br />X2 = mean for revegetated area data (Dover ar production) <br />s,= = variance of reference area data <br />sl= = variance of revegetated area data <br />r4 = number of observations of reference area data set <br />nZ = rnim}wr of observations of revegetated area data set <br />MR 91-68 <br />Permit Renewal 780-136-2 Revised 06/11/91 <br />