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0 <br />0 <br />EXHIBIT 8 <br />BOWIE NO. 2 MINE <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />STORM EVENTS <br />10 YEAR 24 HOUR EVENT <br />25 YEAR 24 HOUR EVENT <br />100 YEAR 24 HOUR EVENT <br />1.8 INCHES <br />2.1 INCHES <br />2.6 INCHES <br />The information presented for peak flow calculations is developed with the use of the <br />computer program STORM ver 6.21 The output data from the STORM program <br />computer run follows this section. <br />The upland run -off areas are shown on Map No. 20. The run -off curve numbers are <br />developed based upon vegetation and soil types. Vegetation data is presented in <br />Exhibit 5 and shown Map 3. Soils data is presented in Exhibit 7 and shown on <br />Map 4. Drainage plans are shown on Maps 21 1/4 through 21 4/4. <br />Juniper Woodland Community <br />Baseline Reference <br />Vegetative Cover % <br />46.0 <br />51.4 <br />Vag Rep. Table B -1 <br />Litter % <br />29.8 <br />43.1 <br />Ve Re Table B-1 <br />9 P <br />Ground Cover <br />------ 75.8- - -- <br />-- <br />--- -94.5 <br />Table 2 -2d -Runoff curve numbers for and and semiarid rangelands <br />Cover Type - Pinyon - juniper, juniper or both, grass understory <br />Hydrologic Condition Good <br />Soil Type - Absarokee C <br />Curve Number 61 <br />1dirxed Staub Copwf;r aVy <br />Baseline Reference <br />Vegetative Cover % <br />70.1 <br />68.8 <br />Vag Rep. Table B -2 <br />Litter % <br />23.5 <br />22.8 <br />Veg Rep. Table B -2 <br />Ground Cover% <br />---------------- <br />93.6 <br />- - - - -- <br />91.6 <br />Table 2 -2d -Runoff curve numbers for and and semiarid rangelands <br />Cover Type - Oak - aspen- mountain brush mixture <br />Hydrologic Condition Good <br />Soil Type - Absarokee C <br />Curve Number 41 <br />PR -07 EXH -8 -2 <br />2/03 <br />