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• enumerated by species. Determination of whether or not a plant could be counted was dependent upon <br />the location of its main stem or root collar where it exited the ground surface with regard to belt limits. <br />Rare and Endan4ered Plant Species <br />A list of rare and endangered plant species that have been found within athirty-mile radius was <br />obtained from the Colorado Natural Heritage Program's System for Conservation Planning website <br />(www.ndis.nrel.colostate.edu/escop/). Information regarding habitat requirements and level of state and <br />federal protection was also acquired for each species. Although all plant species observed within the <br />vegetation study area were identified, special attention was given to a search of appropriate habitats for <br />these and similar species. <br />Sample Adequacy Determination <br />Sampling within each community type (Juniper Woodland and Mountain Shrub) and associated <br />reference areas for ground cover and production was conducted to a minimum of 20 samples (50 for <br />production). From these transects and production quadrats, a sample mean and standard deviation for <br />• each variable was calculated. When statistical testing is required, collection of an adequate sample <br />(nm;n) is typically necessary to insure reliable estimates of the population (e.g., estimates to within 10% <br />of the true mean (N) with 90% confidence). The Cochran formula below was utilized, as it is one of the <br />most commonly used formulas for determination of sampling adequacy and it is the one recommended <br />for use by CDMG guidelines. When the inequality (nm;n <_ n) is true, sampling can be considered to be <br />adequate, and nm;n is determined as follows: <br />nmin = ~~ ~~ ~ (0.1 x ~z <br />where: n =the number of actual samples collected (initial size = 20) <br />t =the value from the one-tailed t distribution for 90% confidence with n-1 <br />degrees of freedom; <br />s 2 =the variance of the estimate as calculated from the initial samples; <br />x =the mean of the estimate as calculated from the initial samples. <br />~~~,v~ ¢~~~ A§~®~naa~~, iNC. Page A-5 Exhibit 5 - Appendix A -Vegetation Methods <br />