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measurements. However, using centimeters to measure the trunks of aspen 4-6 feet in height is only <br />likely to give a couple of size classes. Measuring trunks to the neazest millimeter might provide more <br />meaningful data to be used in the regression analysis. <br />The CDOW has also reviewed the revised revegetation plan. In our letter dated June 28, 2002 we <br />recommended that Seneca make a greater effort to insure shrub establishment. The revised plan states <br />that the mine will plant 78 acres with the shrub seed mix (Seed Mix 6), which is better than the 20 acres <br />minimum in the previous plan. However, the cover letter states that Seed Mix 6 is always combined <br />with Seed Mix 1 or Seed Mix 2. Based on our understanding of shrub establishment, we recommend <br />planting Seed Mix 6 without Seed Mix 1 or Seed Mix 2 to reduce competition from the grasses. Grasses <br />germinate faster than shrub species, thus using much of the available moisture before the shrub species <br />have a chance to germinate. In addition, shrub seedling growth is slower than grasses, which also favors <br />grasses over shrub species. It is always possible to seed the grasses at a later date after the shrubs have <br />had time to become established. Also, as mentioned in our previous letter we recommend an increased <br />focus on mountain big sagebrush (Artemesia tridentata vaz. vaseyana) for two reasons. First, other <br />mines have been successful reestablishing sagebrush and second, sagebrush communities are important <br />wildlife habitat. Finally, the CDOW is in favor of Seneca's commitment to an area of live topsoiling <br />and live clump (tree) transplanting and would recommend more of both if at all possible. <br />Again, thank you for the opportunity to provide comments. <br />Sincerely, <br />/~.n O c~~~~- <br />Ron D. Velazde <br />Northwest Regional Manager <br />cc: Susan Werner <br />Jim Haskins <br />Liza Graham <br />Mazch 12, 2003 <br />Page 2 <br />