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t = the t statistic (one - tailed, 90% confidence; n -1 degrees of freedom; if n >30, t = 1.282 for purposes of <br />this study); <br />d = acceptable amount of inherent variability to be identified between the sample mean and the true <br />population mean (0.15 for purposes of this analysis); <br />x = sample mean for woody plant density data. <br />The criterion for formal judgement of the adequate stocking of woody plants on the Sage Creek site is as <br />follows: <br />Overall average density >_ 100 stems per acre with at least 5% of the BRB block possessing ? 1000 <br />stems per acre. <br />Climatic Data <br />Seneca Coal Company (SCC) has historically provided precipitation data for the nearby Seneca II and <br />IIW Mines, however 2011 data was not available as of March 2012, and therefore 2011 precipitation data <br />was obtained from the NOAA administered Western Regional Climate Center (WRCC) for the nearby <br />town of Hayden (Station 053867). Since the long -term average for the Seneca IIW mine exists for only <br />26 years, the long -term average monthly precipitation data from Hayden (Station 053867) was used as an <br />appropriate base for comparison. Temperature data from the Hayden station was used as well. <br />RESULTS <br />Sample data from the 2011 BRB -5 revegetation monitoring studies are presented in Tables A -1 through <br />8. Sampling data are summarized in appendix C. Data on cover, production, and woody plant density <br />are in Table C -1. Data on species density by lifeform are tabulated for sampled areas in Table C -2. Data <br />on relative cover by lifeform are compiled in Table C -3. Statistical adequacy of sampling is reviewed in <br />Table C -4. The list of plant species observed during these studies (reclaimed and reference areas) is <br />included as Table D -1. Seed mixes used in the reclamation areas are included for reference in Appendix <br />E. Photographs of representative locations within the reclaimed areas sampled in 2011, as well as <br />photographs of Mountain Brush and Sagebrush Reference areas, are included in Appendix F. Graphs of <br />vegetation and climate data are presented in Figures C1 through 10 of this report. <br />In the cover descriptions below, species listed as "also present" were not "hit' during point- intercept <br />sampling but were present within one meter of either side of the 50 m sample transect line. Unless <br />12 <br />