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RULE 2 PERMITS <br />2.04.10 Vegetation Information <br />Six vegetation communities and a small amount of cropland exist within the Colowyo permit boundary. <br />The vegetation communities are sagebrush, mountain shrub, juniper, aspen woodland, riparian and <br />grassland. <br />The approximate extent of the vegetation communities throughout the permit area is shown on Regional <br />Vegetation Map (Map 3). The vegetation communities on the area to be disturbed by' mining are mapped <br />in more detail on the Vegetation Map (Map 4). The amount of area comprising each type to be mined is <br />found in Table 2.04.10-1, Vegetation Community Distribution on Areas to be Mined. Areas currently <br />used as reference areas to evaluate the success of revegetation are also located on the Vegetation Map <br />(Map 4) and the Regional Vegetation Map (Map 3). <br />During the summer of 1980, an intensive vegetation study was completed covering the initial permit area <br />to be disturbed by mining. The area to be mined consists, primarily, of the sagebrush and mountain shrub <br />communities with small inclusions of aspen and grass. <br />During the summer of 1988 vegetation study was completed for the additional areas to be added to the <br />permit. The additional areas to be mined consisted, primarily, of the sagebrush, mountain shrub and aspen <br />communities. <br />Vegetative mapping was accomplished utilizing information from previous vegetation surveys in the area, <br />the 1976 VTN Colorado Inc. study, color aerial photography and on the ground observations. Sampling <br />locations were selected by using 300 foot by 300 foot numbered grid system covering the entire area to be <br />sampled. Individual transect sites were sampled at random using the numbers from the grid system for <br />each vegetation type. At each selected point, a 100 foot transect was laid out oriented in a randomly <br />selected compass direction. Five random points along each transect were then selected for the quantitative <br />vegetation sampling. <br />Herbaceous cover data was collected using a 10 point frame at each of the five points along the transect. <br />The first hit by each pin on the herbaceous vegetation was then recorded by species. <br />Production samples were taken by clipping a 30cm x 60cm plot at each of the same five points along the <br />transect. The clipped herbaceous vegetation was separated into grasses and forbs. There were no <br />measurable amounts of annuals sampled. The samples were air dried then weighed. 60cm x 60cm plots <br />were used for the 1988 data and samples were oven dried prior to weighing. <br />Woody plant density data was obtained by recording the numbers of woody plants along a three foot wide <br />belt the entire 100 foot length of each transect. <br />Species composition and cover for the initial 1980 data is shown in Table 2.04.10-2, 1980 Herbaceous <br />Cover by Species. The 1988 data is summarized in Table 2.04.10-3, 1988 Herbaceous Cover by Species. <br />Summaries of the data can be found on Table 2.04.10-4, Summary of Herbaceous Cover. <br />Herbaceous productivity for the sagebrush, mountain shrub, and aspen communities is shown on Table <br />2.04.10-5, Production Data Summary. <br />Information pertaining to statistical tests to be performed for determination of revegetation success is <br />contained in Section 4.15. <br />Rule 2 Permits 2.04.10-1 Revision Date: 6/23/08 <br />Revision No.: MR-91