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r? <br />Table 5. SEDCAD Pond Output During Construction <br />SEDCAD Output Pond 1 Pond 2 <br />10-year, 24-hour runoff volume (ac ft) 0.37 0.43 <br />25-year, 24-hour peak discharge (cfs) 0.80 0.85 <br />Peak outflow TSS, mg/1 535 62 <br />Peak outflow SS, ml/1 0.00 0.00 <br />Freeboard for 25-year, 24-hour peak discharge 1.7 feet 1.3 feet <br />3 year sediment storage volume (ac ft) 0.009 N/A <br />Table 6. SEDCAD Pond Output After Construction <br />• <br />SEDCAD Output Pond 1 <br />10-year, 24-hour runoff volume (ac ft) 0.29 <br />25-year, 24-hour peak discharge (cfs) 2.1 <br />Peak outflow TSS, mg/1 54 <br />Peak outflow SS, ml/1 0.00 <br />Freeboard for 25-year, 24-hour peak discharge 1.6 feet <br />3 year sediment storage volume (ac ft) < 0.001 <br />Construction Specifications <br />The use of proper construction techniques is required for the success of this project. In general: native <br />material to be used for embankment fill should: <br />• Be free from frozen or deleterious material <br />• Be placed in loose lifts not exceeding 12 inches <br />Be compacted to 95 percent of a standard proctor (ASTM-D698) within plus or minus 2 percent <br />of optimum moisture content <br />The filter diaphragm should be placed in loose lifts not exceeding 12 inches, and compacted to a <br />minimum of 70 percent of the relative density as determined by ASTM D 4254. Effort should be made to <br />avoid segregation of the filter material and to avoid its contamination with embankment fill. <br />Twentytmile Coal Company 18L Shaft Pad 7 Water & Earth Technologies, Inc. <br />Drainage and Sediment Control System Design March 2, 2009