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2.3 SAMPLE NUMBERS/SAMPLE ADEQUACY <br /> For the purposes of this study,total vegetation cover and total herbaceous production sampling <br /> of the reclaimed areas and extended reference area was undertaken to sample adequacy with a <br /> minimum of fifteen (15) samples. <br /> Parameter sample adequacy testing occurred at the one-sided 90% confidence level. <br /> Comparisons between sample mean parameter values and the revegetation success standard <br /> assume that the sample mean value accurately represents the population mean in all cases. <br /> The following formula was used for sample adequacy calculations: <br /> nmin <br /> (t)2 (s)2 <br /> = <br /> (d Xbar)2 <br /> where: nmin=minimum sample size <br /> s= sample standard deviation <br /> t=the Student's t distribution value at the 90%level(one-sided) <br /> d=percent acceptable deviation from the mean(10%) <br /> Xbar=sample mean <br /> 2.4 STATISTICAL ANALYSIS <br /> Statistical analysis for the revegetation success criteria of total vegetation cover and total <br /> herbaceous production is required if the value of the sample mean from the reclaimed areas for <br /> either parameter is less than 90 percent of the corresponding mean parameter value from the <br /> extended reference area. The 2020 reclaimed area sample means for total vegetation cover and <br /> total herbaceous production were greater than the corresponding applicable revegetation <br /> success criteria mean values from the extended reference area,therefore no statistical analysis <br /> was required. A statistical analysis is not required for the evaluation of species composition. <br /> 2.5 SPECIES IDENTIFICATION AND VERIFICATION <br /> Species identification was accomplished in the field through the use of plant identification keys <br /> (Harrington, 1954, Whitson, 1987; Weber, 1990; Zimdahl, 1990, Stubbendieck, et al, 1995). <br /> In cases where plant identification was inconclusive in the field, voucher specimens were <br /> pressed for lab identification, and verified by Mr. Tim Hogan and Ms. Dina Clark of the <br /> University of Colorado, Boulder Herbarium. <br /> Oxbow Mining,LLC Elk Creek Mine Page 5 <br /> 2020 Phase III Bond Release(Year 1):Vegetation Report <br />