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• <br />• <br />averaged 17.33 percent (Appendix Table 2.04.10 -21, Irrigated Pasture Reference Area - Plant <br />Cover). <br />Five plant life forms were encountered in the cover sampling of this site. Native perennial <br />grasses and grasslikes were the dominant plant life form encountered on this site, contributing <br />61.80 percent of the total plant cover and 80.69 percent of the total relative cover found on this <br />site. Perennial forbs were the second most dominant plant life form, contributing 7.47 percent of <br />the total plant cover and 9.74 percent of the total relative cover found on this site. Noxious <br />Weeds contributed 5.07 percent of the total plant cover and 6.61 percent of the total relative <br />cover found on this site. Annuals and biennials contributed 2.27 percent of the total plant cover <br />and 2.96 percent of the total relative cover found on this area. Only one woody plant the tree, <br />Russian Olive, a state listed noxious weed was found growing on this site. <br />Tall Fescue, a planted introduced pasture grass was the most dominant plant species <br />encountered, contributing 25.33 percent of the total relative plant cover found on this site. The <br />other dominant plants encountered were: Kentucky Bluegrass, Baltic Rush, Meadow Fescue and <br />Spreading Bentgrass contributed 14.97, 14.19, 10.62 and 6.88 percent, respectively, of the total <br />relative cover on this area. <br />The locations of the 15 cover transects sampled in the Irrigated Pasture Reference Area are <br />shown on Map 2.04.10 -3 - Irrigated Pasture Reference Vegetation Area. The sample adequacy <br />calculations in Appendix Table 2.04.10 -2, New Horizon North Mine Area - Sample Adequacy <br />Calculations, document that the number of samples required to describe this site at the 90 percent <br />confidence interval was 3.9 transects. <br />Production. The results obtained from the sampling of 51 production transects on this area are <br />summarized in Appendix Table 2.04.10 -22, Irrigated Pasture Reference Area - Production. <br />Average total perennial herbaceous forage production on this site equaled 83.98 g /1/4 m or <br />2,993.9 of air dry forage per acre. Perennial grasses and grasslikes contributed 76.94 <br />g/1 /4 m or 91.62 percent of the herbaceous forage produced on this area. Perennial forbs, <br />contributed 7.04 g/1 /4 m or 8.38 percent of the herbaceous forage production on this area. <br />The locations of the 51 production transects sampled for this site are shown on Map 2.04.10 -3 - <br />Irrigated Pasture Reference Vegetation Area. The sample adequacy calculations in Appendix <br />Table 2.04.10 -2, New Horizon North Mine Area - Sample Adequacy Calculations, document that <br />the number of samples required to describe this site at the 90 percent confidence interval was <br />52.9 transects. <br />Shrub Density. The shrub density counts obtained from the 15 belt transects sampled in this <br />area are summarized in Appendix Table 2.04.10 -23, Irrigated Pasture Reference Area - Shrub <br />Density. The average shrub density was determined to equal 0.33 shrubs per one hundred square <br />meters or 13.5 shrubs per acre. Russian Olive was the only woody species encountered. <br />• Section 2.04.10 Page 22 April 2011 <br />