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Section 780.18 (b) Continued. <br />DeparGnent of Fhvirormiental quality. As proposed in these guidelines and in <br />• Section 816.116, grourcl cover arri productivity will be sampled on both <br />undisturbed reference a,~G and on areas that have „*r7Pngnrw oca~lplete <br />reclamation. rr^~i~TMbed areas aryl marked reference areas will be established <br />that are r*+*~'+*ative of the soils, slope, aspect, and vegetative cc~mm~nity of <br />the site ai~ti,+-t,~~ by mining. 'Ilia reference areas far the ~*'+~;t area are shown <br />on Vegetation Maps 15 and 16. 'ihe reference areas are a~ Y;~+~ately 2'~ acres in <br />size and will be given the identical kind of management found on adjaoPnt lands <br />of the same type. prPm;nim lard use aryl management practices are described Zn <br />Section 779.22. Sampling of the vegetation within the pxvposed referenced areas <br />will be based upon the randcanized location of fifteen 50 meter transacts. 'Ilia <br />specific sampling techniques to be employed are those d;er„~ec+A in Section 779.19 <br />and utilized during the 1979 data collection period. 'Ihe sampling will be done <br />at an intensity that will satisfy the 9o percent confidence interval. Data will <br />be collected throughout the bond liability period to determine when the cover <br />equals that of undisturbed areas, and when grazing can be started. <br />Revegetation of the reclaimed sites will be deemed successful when ~asur~++P*+ts <br />• of reclaimed herbaceous cover and productivity are at least 90 percent of the <br />cover and productivity values for the reference area with 90 percent statistical <br />confidence. If herbaceous cover and productivity on the revegetated area are <br />determined to be less than the reference areas, a one--tailed "t" test will be <br />performed to determine if there is a statistically significant difference. Based <br />on this test, revegetation will be denied successful when the calculated "t" is <br />less than ar equal to the "t" value fran the one-tailed "t" distribution table <br />(see August 9, 1980 response to OSM stipulation ~9). Zt1e following forn¢Lla for <br />the one-tailed "t" test was obtained frc~ page 13 of Statistical Etraluation of <br />Reveaetati.on SuocPSS on Goal Lands In the West, L.L. Larson, OSTI-Region V, <br />February 26, 1980: <br />t = -7 -X 2 <br />sl= + g2s <br />nl n 2 <br />• <br />MR 91-68 780-137 Revised 06/11/91 <br />