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Herbaceous production plots were 0.50 meter2 in area. All current year above ground live <br />herbaceous plant biomass was clipped within the 0.50 meter2 quadrat. Production material <br />was air dried until weights varied by no more than 0.1 g. <br />2.2.4 Species Composition <br />Species composition information was derived from quantitative vegetation cover data. <br />Relative cover information provided a basis for evaluation of the importance of each <br />encountered plant species and lifeform and for comparison to the final revegetation success <br />criterion. The table presenting data summaries for total vegetation cover for each area <br />sampled also contains the relative cover by species and a column depicting the numerical <br />ranking of each species by relative cover within the area. <br />2.3 SAMPLE NUMBERS/SAMPLE ADEQUACY <br />For the purposes of this study, total vegetation cover and total herbaceous production <br />sampling were undertaken to sample adequacy with a minimum of fifteen (15) samples. <br />Parameter testing occurred at the one-sided 90% confidence level. Comparisons between <br />sample mean parameter values and the revegetation success standard assume that the sample <br />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 />(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 />For 2014 sampling in the proposed reference area, the following values for total vegetation <br />cover (total vegetation cover in percent and total herbaceous production (wet values) yielded <br />the minimum sample sizes presented. <br />Parameter <br /># Samples <br />Mean <br />Std. Dev. <br />Nmin <br />Total Vegetation Cover <br />20 <br />24.50 <br />4.67 <br />6 <br />Total Herbaceous Production <br />35 <br />45.63 <br />19.60 <br />31 <br />2.4 STATISTICAL ANALYSIS <br />No statistical analysis was undertaken for this preliminary sampling and reporting at the <br />proposed reference area. <br />Oakridge Energy, Inc. Carbon Junction Mine Page 3 <br />2014 Proposed Dryland Reference Area Report <br />