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• EXHIBIT 8 <br />BOWIE NO.2 MINE <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />LOADOUT 8 GOB PILE NO.3 <br />STORM EVENTS <br />10 YEAR 24 HOUR EVENT 1.8 INCHES <br />25 YEAR 24 HOUR EVENT 2.1 INCHES <br />100 YEAR 24 HOUR EVENT 2.6 INCHES <br />The information presented for peak flow calculations is developed with the use of <br />SEDCAD. The output from SEDCAD follows is summarized on the ditch design sheets. <br />The upland runoff areas are shown on Map No. 20. The runoff <br />curve numbers are developed based upon vegetation and soil <br />types. Vegetation data is presented in Exhibit 5 and shown on <br />Map 3. Soils data are presented in Exhibit 7 and shown on <br />Map 4. Drainage plans are shown on Maps 21 1/4 & 314. <br />There are three soil types that will be disturbed at the loadout. <br />They are Work, Progresso and Potts loam. Work and Progresso <br />are soil type C and Potts is a soil type 8. The C soil type will <br />be used for the runoff glculations. <br />The vegetation study for the loadout is located in Volume III <br />Tab 5. Cover data for the vegetation types is presented in <br />Table I in the vegetation study. <br />Pastures <br /> Cover <br />Vegetative Cover % 73.5 <br />Litter % 23.0 <br />Ground Cover % 96.5 <br />Table 2-2c-Runoff curve numbers for other agricultural lands <br />Cover Type -Pasture, grassland or range <br />Hydrologic Condition Good <br />Soil Type -Loam C <br />Curve Number 74 <br />Irdgated Hayfields <br />Cover <br />Vegetative Cover % 91.6 <br />Litter % 8.3 <br />Ground Cover % 99.9 <br />Table 2-2c-Runoff curve numbers for other agricultural lands <br />Cover Type -Meadow -continuous grass, generally mowed for hay <br />Hydrologic Condition Good <br />• Soil Type -Loam C <br />Curve Number 71 <br />Exh-8 - 162 - <br />12/06 <br />TR-045 <br />/~ pp/LoV6l) <br />7~3~a7 <br />