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on Nunn Loam (Type C hydrologic Soi] Group), a CN value of 74 is determined from Figure <br />' S-3. <br />' 3.6 Hydrograph Response Shape <br />See paragraph 2.5. A slow response is used for the hay field. <br />3.7 Soil Erodibility Factor (K) <br />See Paragraph 2.3. A value of 0.24 is used in this demonstration (the AVF is on Nunn <br />Loam). <br />3.8 Control Practice Factor (CP) <br /> <br /> <br /> <br />3.8.1 Pre-mined State <br />A CP of 0.019 is appropriate to the AVF in its pre-mined state is (AVF reference area, see <br />Paragraph 2.8). Based on the description in the Permit documentation (see Paragraph <br />3.5.1), a CP of 0.03 is selected for a second scenario for the pre-mined state. <br />3.8.2 Reclaimed State <br />Two areas of the 1996 Vegetation Survey (1990 and 1991 seedings) are combined to <br />represent the reclaimed AVF area in this demonstration. The survey indicated a <br />predominately forb (67%) ground cover with no appreciable canopy of tall weeds, brush, or <br />trees. The percent ground cover in contact with the ground was 87%. A CP factor of 0.021 <br />for this demonstration is interpolated in the following table (from Table 5.5c of the <br />SEDCAD+ documentation). <br />Page 11 of 34, 7 Oct 96 <br />