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III IIIIIIIII"II III °o ~Ciz~ izooi-- <br />• ~ ~ ~11Exhibit 15 -Sediment Ponds <br />Table of Contents ~' <br />Exhibit 15 Pond Drainage Design (Narrative) <br />SEDCAD and Modeling <br />Table 1 Hydrologic Response Values for Soil Associations <br />'Fable 2 Curve Numbers Associated with Vegetation Types <br />Table 3 Vegetation Community Ground Cover and Curve Numbers <br />'fable 4 Major Crossings with Modified CNs <br />Table 5 Lorencito Side Canyons with Modified CNs <br />'Fable 6 LUC Values <br />Table 7 Composite Textures for the Erodible Fraction of Soil Series <br />and Associations at Lorencito <br />Table 8 Overland Flow Length Factors Used in Rusle Analyis <br />Table 9 Soil Erodibility Factors (k) for Soil Associations <br />Table ] 0 CP Values <br />References <br />2. 'fable 15-14: Emergency Spillway Embankment Channel Design Details <br />3. Lorencito Canyon Surface Mine -Ditch Summaries <br />-Jeff Canyon Surface Mine -Fill Areas -Ditch Summary <br />_ -Lorencito Canyon Surface Mine - Primero Fill Areas -Ditch <br />• Summary <br />4. Small Area Exemptions <br />- Calculation Sheets <br />- Silt Fence Design <br />5. Figure EX 15-14: Sedimentation Pond Summary <br />6. Figure EX 15-15: Surface Mines -Surface Water Management Plan <br />7. SEDCAD 4 Pond and Ditch Design Reports <br />a. Raw Coal Loadout Sediment Control (Figure 15-4) <br />0-Year 24-Hour Storm Event for Lorencito Loadout Pond <br />25-Yeaz 24-Hour Storm Event for Lorencito Loadout Pond <br />100-Year 24-Hour Storm Event for Lorencito Loadout Pond <br />b. Fill I Sediment Control Pond OOIa (Figure EX 15-5) <br />10-Year 24-Hour Storm Event for Fill 1, Pond OOIa <br />25-Year 24-Hour Storm Event for Fill 1, Pond OOIa <br />c. Fi112 Sediment Control Pond 002 (Figure EX 15-7) <br />l0-Year 24-Hour Storm Event for Pond 002 <br />25-Yeaz 24-Hour Storm Event for Pond 002 <br /> <br />