2010-12-17_REVISION - C1981019 (160)

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• • The tabular "t" comparison statistic (ta ) is calculated as follows: Then if the inequality (t* <_ ta) is true, the test is passed and the baseline and reference areas can be considered to be from identical populations. 2.9 Rare Threatened and Endangered Plant Species Previous work in the area for several previous permits, resulted in the determination that no known rare, threatened, or endangered flora or fauna occurred in the vicinity of the project area. However, a current list of rare, threatened, and endangered plant and animal species that are known to occur within a two-mile radius of the study area was solicited from the Colorado Natural Heritage Program (CNHP) (see Appendix B). A search of the CNHP database revealed only a single taxon, a reptile species (Co/uber constrictor mormon- western yellowbelly racer), that had been previously located within the search area (approximately 42 square miles). This single rare species, the western yellowbelly racer, was routinely observed in the Bottomland Community type by Cedar Creek biologists. t* (X -x,)l (S21In) +(522/n2) :where : x, mean of the baseline area x ,. = mean of the reference area s2 = variance of the baseline area s , variance of`the reference area 2 n = sample size for the baseline area n2 = sample size for the reference area [(S,2 /nI)t,,l + (s22 /n2)t,1211(6,2 /n, + s22 /n2) where d = 0.05 level Furthermore, all plant species observed during field surveys by Cedar Creek in 2005 were identified and cross-referenced with the Colorado Rare Plant Field Guide. No rare threatened or endangered plant species were observed in 2005 or have previously been observed within the study area. A complete list of plant species observed during survey work is provided on Table V1. C?IIDAff3?1EIEIISA?ffi®C1IAIlfEffi, INC. Page it 2005 Collom Vegetation Survey