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JHne 1991 Cypw TCC • Subridenn EJferu on Vegemtion ~ 4 <br />• Surface subsidence effects are expected to consist of limited reductions in surface elevations, <br />gentle changes in surface and stream gradients, and possible loalized shifts in vegetation <br />composition and characteristia. <br />It is antidpated chat changes in both elevation and gradient will be within the range of natural <br />topographic variance for this area. Any ships in vegetation would relate to minor loalized <br />changes in distance to the water table. These changes would generally be consistent with the <br />natural changes which accompany variation of stream channel co~gun[ion as meander patterns <br />change over time and channel segments aze rubsequen[ly abandoned. <br />As documented by Exhibit 45, Fish Creek AVF/Stream Study, HydrologicAnalysis, °... mining <br />in Panels S and 6 will not have any significant detrimental impacts on the essential hydrologic <br />functions or water availability of [he AVF.° Given the lack of significant hydrologic impacts, <br />potential rubsidence related vegetation impacts are ezpected to be negligible. <br />Existing available information including analysis of existing vegetation, subsidence projections, <br />and projected hydrologic impacts, support the conclusions presented above. TCC proposes [o <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 areas potentially effected <br />by subsidence will be compared with similar data for adjacent undisturbed areas. This <br />comparison will allow evaluation of any subsidence related effects rela[ive to natural variance <br />occurring within the sampled vegetation communities over the same time interval. <br />• <br />• <br />ACZ /nc. ' P.O. Box 7740!8 ' Stmmboat Spring; Colorado 80477 ' ~03f879~6160 <br />