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<br />' rock, litter or bare ground). Noxious weed species will be recorded but will not count towards <br />total vegetation cover. <br />t Recording Total Cover data by plant habit or species allows evaluation of species diversity and <br />relative contribution to the vegetation community through simple analyses without further <br />measurement Additionally, statistical adequacy of samples is readily evaluated. First-hit, <br />' point-intercept sampling may also be used efficiently in undisturbed vegetation communities if <br />it becomes necessary to adjust Total Cover success standards to local project site conditions. <br />For these reasons, first-hit, point-intercept measurements are the preferred and least expensive <br />' method for evaluating Total Cover and habit diversity. Therefore, it is proposed that Total <br />Cover be measured using the first-hit, point-intercept method when evaluating revegetation <br />success. <br />Revegetation success monitoring may be conducted as soon as vegetation is considered <br />adequately reestablished. If success criteria are not met, appropriate corrective action plans will <br />be developed and implemented as necessary. Vegetation growing in the second or subsequent <br />seasons that is capable of mceting or exceeding revegetation success criteria will be considered <br />to be permanent, and it will not be necessary to subsequently reevaluate such vegetation. <br />t Total Cover sample mean and standard deviation will be determined for each arra sampled. <br />Adequacy of sample popuations will be detemuned in accordance with the starrdard formWa <br />for calcWating sample size: <br />Where: <br />N = number of samples collected, <br />' t =the two-tailed distribution value for 80% confidence with N-1 degrees of freedom, <br />s =variance of the estimate calculated from the initial samples, and <br />' x =the mean of the estimate calcWated from the initial samples. <br />Sample populations will meet or exceed minimum size requirements for revegetation success <br />' sampling. A minimum of 15 samples and a maximum 50 Total Cover samples will be taken <br />within each proposed revegetation liability release area. <br /> <br /> <br /> <br />1 <br />' American Soda, LLP. 5-13 <br /> Soil Conservation, Plosion and Sediment <br /> Control, reclamatron wd Revcgetasion Ran <br />' October 28, 1998 <br />