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16. Please explain why the area of the shaft #3 SAE is .41 acres in the SEDCAD SAE <br />hydrology run. It appears to be closer to 1.4 acres, digitizing off of Map 54B. <br />17. Volume 8.A-2 contains an SAE demonstration for topsoil stockpile #4. On which map is <br />this topsoil stockpile located ? <br />18. With the addition of the shaft #3 area as an SAE, it would appear that the Golder & <br />Associates cover letter, dated February 27, 1997 and contained in Volume 8A-2, <br />describing the 5 SAES at Sylvester Gulch, needs to be updated. Please provide an <br />updated cover letter or an appropriate follow-up letter that describes the as-built SAE <br />situation in Sylvester Gulch. <br />19. The Division is unable to locate the as-built certification for the SG-I pond. Please <br />provide this certification. <br />North Soil Storage Area <br />20. The North Soil Storage Area Sediment Pond SEDCAD run shows that the expected <br />runoff volume is greater than the previous submittal had accounted for. The same <br />computer run also shows that the geometry of the pond has changed. Please submit as- <br />built designs for the North Soil Storage Area Sediment Pond and demonstrate that the <br />pond has sufficient capacity. <br />21. Since the peak flow calculations have changed at the North Soil Storage Area, please <br />submit updated channel and riprap designs for ditches NA, NB, NC and the clean water <br />ditch. <br />22. The Division is unable to locate the as-built certification for the North Soil Storage Area <br />pond. Please provide this certification. <br />Main Facilities <br />23. According to the revised SEDCAD run for pond MB-2R, the sediment storage volume <br />for the 10 year-24 hour event increased from 1.39 acre-feet to I.58 acre-feet. Also, the <br />peak dischazge for the 10 yeaz-24 hour event increased from 36.68 cfs to 41.52 cfs. <br />Referring to the elevation-area-capacity-discharge table that is in the permit application, <br />this would result in discharge from the ]0 year-24 hour event flowing through the <br />emergency spillway, in violation of Rule 4.05.6(4). Please submit a revised pond design <br />that would allow the dischazge of the 10 year-24 hour event to be incompliance. In <br />addition, please provide the elevation-dischazge tables and the elevation-area-capacity- <br />discharge tables for the three SEDCAD runs for pond MB-2R. <br />