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Juno 1991 Cyprur 7CC • Subsidenn EJfats on Vegetatum ~ 1 <br />Surface subsidence effects are expected to consist of limited reductions in surface elevations, <br />gentle rltanges in surface and stream gradients, and possible loaliud shifts in vegetation <br />composition and characteristic. <br />It is antidpated that changes in both elevation and gradient will be within [he range of natural <br />topographic variance for this area. Any shifts in vegetation would relate to minor loaliud <br />changes in distance to the water table. These changes would generally be wnsistent with the <br />natural changes which accompany variation of stream c~tannel configura[ion u meander patterns <br />change over [ime and channel segmen[s are subsequently abandoned. <br />As documented by Exhibit 45, Fish Creek AVF/Stream Study, Hydrologic Analysis, `... mining <br />in Panels 5 and 6 will not have any signifiant detrimental impacts on the essential hydrologic <br />functions or water availability of the AVF.' Given the lack of significant hydrologic impacts, <br />potential subsidence related vegetation impacts aze ezpetted [o be negligible. <br />Existing available information including analysis of existing vegetation, subsidence projections, <br />and projected hydrologic impacts, suppon [he conclusions presented above. TCC proposes to <br />validate the conclusions through the vegetation monitoring program described in Exhibit 7C, <br />Fish Creek AVF/Stream Study, Monitoring Plan. Vegetation sampling will occur both prior <br />to and subsequent to undermining and subsidence. Monitoring data for azeu potentially effected <br />by subsidence will be compared with similaz data for adjacent undisturbed area. This <br />comparison will allow evaluation of any subsidence related effects relative to natural variance <br />occurring within the sampled vegetation communities over the same time interval. <br /> <br /> <br />ACZ Inc. ' P.O. Box 771018 ' Srmmbaat Springs, Colorado 80177 • (303J879b260 <br />