Laserfiche WebLink
• cover sampling efforts met sample adequacy (see Table 16) the fact that the reclaimed <br />area sample mean exceeds 90% of the Permanent Program standard is sufficient to <br />demonstrate success (Colorado Coal Regulations 4.15.11 (2)(a)). <br />PRODUCTION <br />Since BRB-2 production sampling did not achieve sample adequacy, a Permanent <br />Program-type test would be done using the "reverse" null hypothesis: <br />Comparison Relative to Mountain Brush Reference: <br />tc = (1671.9 - 634.7) / (1124.7 / sgrt 30) = 5.05 <br />Since critical t = 0.845 (one-tailed, alpha = 0.2, 29 df) and tc is greater than this critical <br />value, reclamation success is demonstrated. <br />Comparison Relative to Sagebrush/Snowberry Reference: <br />k = (1671.9 -1038.5) / (1124.7 /sgrt 30) = 3.08 <br />Since critical t = 0.845 (one-tailed, alpha = 0.2, 29 df) and t° is greater than this critical <br />value, reclamation success is demonstrated. <br />Since production values from the BRB-2 reclamation samples have been shown to be <br />greater than those of both reference areas, overall reclamation success for production is <br />demonstrated. <br />SPECIES DIVERSITY <br />With regard to Mandatory Test A, that no single species comprise greater than 60% <br />relative cover in BRB-2, reference to Table 1 shows that the most abundant single <br />species (intermediate wheatgrass) was 15 % relative first hit cover, far below the 60% <br />threshold of concern. Hence Mandatory Test A) is passed. <br />With regard to Alternative Test B, Total Species Density, the following is calculated for <br />BRB-2: <br />i• <br />20 <br />