2008-10-03_REPORT - C1981010 - Laserfiche WebLink

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sample adequacy calculations in Table 2, Trapper Mine Sample Adequacy Calculations, • document that the number of production transects required to characterize this site at the 90 percent confidence interval was 55.0 transects. Since the reclaimed area production value (247.36 g/m) exceeds the revegetation success standard of 62.39 g/m2 with 30 transects, as allowed in the Division's existing regulations found in Section 4.15.11(2) and applying the reverse null statistical approach, it can be concluded that this area satisfies the monitoring requirements with respect to forage production. Since the t, value equals 7.48 and exceeds the t, value of 0.84, according to the Division's regulations, then K is rejected, and revegetation is deemed successful with this sample size. Shrub Density. The shrub density counts obtained from the 48 belt transects taken in this area are summarized in Table 5, Rangeland Reclamation Block AD&H-A/B - 96-98 - Shrub Density. The average shrub density was determined to equal 15.48 shrubs per one hundred square meters or 626.47 shrubs per acre. Antelope Bitterbrush, Mountain Snowberry, Big Sagebrush and Fourwing Saltbush were the most commonly encountered shrubs, contributing 312, 154.2, 84.4 and 66 shrubs per acre respectively. The revegetation shrub density success standard for this area is 400 stems per acre. Since this site averaged 626.47 stems per acre, it can be concluded that this area satisfies the revegetation success standard with respect to shrub density. When this area was sampled in 2007, the shrub density averaged 19.07 shrubs per one hundred square meters or 771.6 shrubs per acre. Big Sagebrush, Antelope Bitterbrush, Mountain Snowberry and Fourwing Saltbush were the most commonly encountered shrubs, contributing 264.4, 236.1, 156.5 and 62.1 shrubs per acre respectively. The locations of the 30 shrub density transects sampled on this site are shown on Map 2, Trapper Mme - Vegetation Transect Area (D-Pit), Map 3, Trapper Mme - Vegetation Transect • Area (H-Fit) and on Map 4, Trapper Mme - Vegetation Transect Area (A Pit). Copies of the individual field data sheets for the woody plant density sampling of this site are found in Exhibit C - Copies of Rangeland Reclamation Block AD&H-A/B - 96-98 - Shrub Density Field Data Sheets. The sample adequacy calculations in Table 2, Trapper Mine Sample Adequacy Calculations, reveals the number of samples required to describe the shrub density on this area at the 90 percent confidence interval was 448.4 transects. Since the actual shrub density counts on this reclaimed site (626.47 stems per acre) exceeds the approved standard (400 stems per acre), using Section 4.15.11(2) of the Division's regulations, monitoring requirements are achieved using the reverse null equation with 48 transects. Since the t, value equals 1.21 and exceeds the t, value of 0.84, according to the Division's regulations, then H. is rejected, and revegetation is deemed successful with this sample size. Species Diversity. The percent relative composition or cover values in Table 3, Rangeland Reclamation Block AD&H-AB - 96-98 - Plant Cover, documents a total of six perennial species possessing a relative cover of greater than 3 percent. Included in this number are four cool season perennial grasses, one perennial forbs and one shrub. When this site was sampled in 2007, there were a total of seven perennial species possessing a relative cover of greater than 3 percent which included five cool season perennial grasses and two species of perennial forbs. The revegetation success standard for species diversity for these revegetated areas is that they are to be dominated by a minimum of at least four cool season perennial grasses and one forb species each possessing at least 3 percent relative cover. On this reclaimed site in 2008, there • 6