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• EXHIBIT 8 <br />BOWIE NO. 2 MINE <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />STORM EVENTS <br />10 YEAR 24 HOUR EVENT L8 WCHES <br />25 YEAR 24 HOUR EVENT 2.1 INCI-IES <br />100 YEAR 24 HOUR EVENT 2. C, INCHES <br />The run-ofT'calculalions presented below are calculated based on the manual -Procedures for <br />Determining Peak Flows in Colorado -published by the Soil Conservation Service dated March <br />1984. <br />The information presented (or peak Ilow calculations is developed wish the use of the computer <br />program STORM ver G.21. The output data 6'om the STORM program computer run follows <br />ibis section. The upland run-off areas are shown on ~7ap No. 20. The run-off curve numbers <br />are developed based upon vegetation mid soil Types. Vegetation data is presented in Exhibit 5 <br />and shown on Map 3. Soils data is presented in Exhibit 7 and shown on Map 4. Drainage <br />plans are shown on Maps 21-I I of 2 mid 21-2 2 of 2. <br />Juniper Woodland Community <br />Baseline Reference <br />• Vegetative Cover % 4G.0 51.4 Vcg Rcp. Table 6-1 <br />Liner % 29.8 43.1 Veg Rep. Table B-I <br />Ground Cover'%, 75.8 94.5 <br />Table 2-2d-Runoff curve numbers for grid mid semiarid rangelands <br />Cover Type -Pinyon juniper, juniper or both, grass understory <br />Hydrologic Condition Good <br />Soil Type -Absarokee C <br />Curve Number (, I <br />Mixed Shrub Community <br />Baseline Reference <br />Vegetative Cover % 70. I GR.B Veg Rcp. Table B-2 <br />Liner % 23.5 22.8 Vcg Rep. Table B-2 <br />Ground Cover % 93.G 91.G <br />Table 2-2d-Runoll~curve numbers for grid mid semiarid rangelands <br />Cover Type -Oak-aspen-mountain brush mixture <br />Hydrologic Condition Good <br />• Soil Type -Absarokee C <br />Curve Number 41 <br />7"2 -o ~ <br />TR-01 EXH-8 -2 - x)/97 <br /> <br />