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iii iiiiiiiiiiiiiiii 999 Hayden Gulch Mine Permit No. C-80-003 May 15, 1996 (Revised 7/12/96) H-G Coal Mine 1996-1997 Vegetation Samnlinq Plan for Final Bond Release 1) Sampling Period Vegetation sampling will be completed in August of each sampling year(1996 and 1997). Data will be collected for herbaceous cover, ground cover classes, herbaceous production and shrub density. Species diversity values will be obtained from the cover data. 2) Sampling Areas The entire reclaimed area will be sampled as one unit except for sites disturbed in the approved shrub augmentation areas which will be surveyed later, during the approved period. The reclaimed area will be sampled for herbaceous cover, herbaceous production and shrub density. Sample sites on the reclamation will be located using a astratified random sampling scheme based on the year of seeding and the acreages seeded within each year. This method is termed proporational allocation. In proportional allocation, at least one sample observation is randomly located within each year of seeding, with the number of observations allocated to any particular year of seeding proportional to the percentage of the total bond release acreage contributed by that year of seeding. Topsoil Pile "C" and the explosives storage site will be included in this sampling scheme as separate units so at least one sample will be collected from each of those areas. The four vegetation reference areas will be sampled separately for herbaceous cover and herbaceous production with weighted averages computed for the bond release comparisons. The weighted average method used for this study will follow that discussed on page 10 of the 1988 vegetation guideline. This is consistent with the 1980 reference area study. The four reference areas include the Aspen, Sagebrush, Gambel Oak and Chokecherry vegetation types. All reference area samples will be randomly located.