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Description <br /> The project is a proposed underground mine southwest of Canon City in Fremont County, <br /> Colorado. One adit (mine entrance) is proposed along with a tailing's storage facility, <br /> operations area (processing plant, maintenance shop) area, an equipment laydown area, <br /> overburden, and topsoil stockpile areas. An existing entrance road will be improved, and gravel <br /> will be used as the road surface. The proposed permit area of the mine is about 82 acres. <br /> The existing ground cover is consistent throughout the area and has shrubs,juniper and pinon <br /> pine trees and native grasses. Existing ground elevations within the site ranges from <br /> approximately 6,690 feet at the southern permit boundary to 6,050 feet at the entrance to the <br /> project from Temple Canyon Road. <br /> The tailings area design was prepared by a separate firm and is not included in this report. For <br /> this report and design, the project was divided into 3 separate areas as follows: <br /> 1. Offsite Stormwater—includes water flowing downhill towards the project <br /> 2. Operations Area—this area includes the adit,plant and plant pad area, and maintenance <br /> shop and pad. <br /> 3. Onsite Stormwater—Includes the laydown, overburden, and topsoil stockpile areas. <br /> There is an existing gravel road from Temple Canyon Road to the site. This road will be <br /> improved, and gravel will be added to the surface. The alignment of the improved road will <br /> generally follow the existing access road. Two short roads from the access road are proposed <br /> to access the plant and maintenance areas. New roads will be crowned with a 1 to 2-percent <br /> slope and surfaced with gravel. <br /> The plant/adit pad site is shown on the plans with a 2 percent slope to the north away from the <br /> mine entrance. Maintenance pad slopes are less than 2-percent away from the proposed <br /> building. Both the plant/adit and maintenance pads will be covered with gravel. No asphalt or <br /> concrete paving is planned for the project. <br /> Hydrologic Soil Groups <br /> A Natural Resources Conservation Service (NRCS) soils map is attached as Appendix A to <br /> this report. The map indicates hydrologic soil groups"A", "B", and"D" are located within the <br /> project boundaries. <br /> Dawson Ranch subdivision located 1 '/z miles east of the project experienced significant <br /> flooding, erosion, and damage from a rain event on July 23, 2018. The damage in 2018 was <br /> like damage caused from a storm in 2009. Since then, surface water culverts, channels and <br /> other facilities have been increased in size to reduce the possibility of future flooding and <br /> damage to the community. The original drainage report for the Dawson Ranch subdivision was <br /> reviewed as part of this study so that proper surface water flows were determined, and sizing <br /> of the detention pond and culverts are adequate for the project. Surface flows were determined N <br /> in part using a hydrologic soil classification"B"in the original Dawson Ranch drainage report. <br /> "B" soils are considered to have a moderate infiltration rate and a moderate rate of cr,04 <br />