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Noxious Weeds <br />Of the plants present on the Routt County Noxious Weed list none were found in the study. <br />Plants present in the study area and on the Colorado State Noxious Weed list (Colo. Dept. of <br />Agric. 19961include the following species: <br />• Bull thistle /Cirsium vu/pare/ was found in the affected areas of the Aspen, <br />Mountain Brush, Sagebrush/Snowberry, Western Wheatgrass/Alkali Sagebrush <br />and Mesic Drainage vegetation types as well as the extended reference area of <br />the Mesic Drainage type. <br />• Houndstangue (Cynog/ossum olficina/el was found in all areas except the Steep <br />Mountain Brush extended reference area. <br />• Flixweed (Descurainie sophial was found in the affected areas of the Western <br />Wheatgrass vegetation type. <br />• Common mullein IVerbascum thapsusl was found in the affected areas of the <br />Mesic Drainage vegetation type. <br />• Canada thistle (Cirsium arvensel was found in the affected areas of the Aspen, <br />Mountain Brush, and Mesic Drainage vegetation types. It was also noted in the <br />extended reference areas of the Mesic Drainage and Aspen vegetation types. <br />Sample Adequacy and Affected/Reference Area Comparability <br />Table 10.2-4 summarizes the sample adequacy calculations for the affected and reference • <br />areas. Sample adequacy for cover sampling was reached in all twelve sample areas. For <br />production, the DMG-specified maximum sample size of fifty was used in all types except <br />Mesic Drainage. With a production sample size of fifty, adequacy was reached in the affected <br />and extended reference areas of the Aspen Forest, Mountain Brush, and Western <br />Wheatgrass/Alkali Sagebrush vegetation types. In the Steep Mtn Brush vegetation type, <br />production sample adequacy values were 82 and 90. In the Sagebrush/Snowberry vegetation <br />type, adequacy of 51 in the affected area was nearly reached, while in the extended reference <br />area, the presence of very heavy western bracken fern growth in four plots drove the average <br />and variance sufficiently high that adequacy was projected at 136. For woody plant density, <br />all areas for which sample adequacy was at issue (again all but Mesic Drainage) showed sample <br />adequacy achieved below fifty, except in the Western Wheatgrass/Alkali Sagebrush vegetation <br />type. In this case, adequate sample density was projected as 134 and 164. The DMG- <br />specified maximum sample size of fifty was used for each area. <br />Results of assessment of affected area and reference area comparability are presented in Table <br />10.2-5. Comparability was indicated in all cases for both cover and production, with the <br />following exceptions: <br /> <br />62 Revised 9/98 <br />~~~~ <br />