Laserfiche WebLink
Total Herbaceous Production <br />Total herbaceous production will be estimated by the harvest method. One herbaceous <br />production plot will be located and randomly oriented at the origin of each cover transect. <br />Herbaceous production plots will generally be 0.50 square meters (m� in area, or larger or <br />smaller based on the prevailing vegetation cover of the area to be sampled. All current year <br />above ground live herbaceous plant biomass will be clipped within the quadrat. Production <br />material will be air or oven dried until weights vary by no more than 0.1g. <br />Species Composition <br />Species composition information is derived from quantitative vegetation cover data. Relative <br />cover information provided a basis for evaluation of the importance of each encountered <br />plant species and lifeform and for comparison to the final revegetation success criterion. <br />Woody Plant Density <br />Woody plant density data will not be collected as there is no woody plant density <br />revegetation success criterion for the mine site, as requested by surface landowners. <br />2.9.7.3 SAMPLE NUMBERS/SAMPLE ADEQUACY <br />Total vegetation cover and total herbaceous production sampling will be undertaken to <br />sample adequacy with a minimum of fifteen (15) samples for each parameter sampled. <br />Parameter sample adequacy testing will occur 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 will be 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) for the <br />given number of samples <br />d = percent acceptable deviation from the mean (10%) <br />Xbar = sample mean <br />2.9.7.4 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 area is <br />less than 90 percent of the value of the final revegetation success criterion for total <br />TR -77 H-21 Revised March 2019 <br />