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-. ~ ~ 0 0 Mr. Mark Loye April 8, 1983 Page 3 Soil Survey, protection of this nature is not necessary. This can be readily interpreted from the survey report. Appendix H addresses the increase in runoff from the mine during the 100-year - 24-hour precipitation event at the bridge abutment on the Black Forest Road. The calculations show that the drainage Swale can readily handle any increase in runoff that might occur. Exhibit G states that the soils on site are within the A hydrologic soil group and have high infiltration rates and low runoff potential. Appendix A is presented as a worst case scenario, but with the planned berms and possible riprap, as well as the well drained soils with high infiltration rate on the site, a sediment control system is not needed. Appendix A resulted from a request by E1 Paso County Commissioners to describe what effect the mining might have on the bridge abutment at the Black Forest Road. The calculations were not intended to show that there was no need for sediment control, although the inference could be made. The intent was that information is Exhibit I and Exhibit G be used together (as should all the Exhibits be) to round out the environmental description at the site. 10. The asphalt plant will be a mobil standard steel manufactured unit with a SOOOIF batch capability. The 35 to 40 foot high unit will be painted an earth-tone color to match the geologic color of the material being excavated. Exhibit E 1. Seeding will be most successful when done in April. Autumn seeding can done, but success may be limited because after germination, warm season grasses may be killed by cold weather before they have developed a winter hardiness. In addition, the cool season grasses may die from lack of moisture as precipita- tion in the autumn is quite variable (See Exhibit K). 2, An annual rye (i.e. Russian wild rye) is planned to be used as the nurse crop at 7 lbs P.L.S./Acre with the native grasses being drilled at 13.9 PLS/Acre. 3. The cover crop will be drillseeded with the following PLS mix: