2011-08-22_APPLICATION CORRESPONDENCE - C2010088 (2)

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Mike Boulay CAM - Please see revised page 2.05 -14 and Map -15. 51j—m. Items resolved. Rule 2.05.3(4) Ponds, Impoundments, and Diversions 52 -55. Items resolved. -13- August 19, 2011 56. In the submittal dated April 11, 2011, CAM revised the curve number of the wetlands to 74, which is a reasonable value to the Division. However, the April 11, 2011 submittal left out the Sedcad peak discharge data sheet for the west culverts that had been included in the original submittal on page Exh -9 -7. In addition, there are no Sedcad data sheets that show the peak discharge for the designed event for the other culverts on site. Finally, there are no Sedcad designs that show that a culvert of a certain diameter can handle the designed peak discharge for the designed precipitation event. Please provide the appropriate Sedcad data sheets for all of the loadout culverts. CAM - Please see SedCad data sheets showing peak discharge for the requested culverts begin on page EXH. 9 -69 in Appendix 9. The culverts were designed as stated on page EXH 9 -2 which states the 'Culvert size based on Figure 4 -18 from the Handbook of Steel Drainage and Highway Construction Products book'. Division Response: In the submittal dated July 8, 2011, the Sedcad design pages showing peak flows were provided as requested. As far as the design pages showing the sizing of the culverts, CAM elected to depend on a reference on page Exh 9 -2 to Figure 4 -18 of the Handbook of Steel Drainage and Highway Construction Products. Since that reference book may not be readily available to others, the Division requests that one generic copy of Figure 4- 18 be included with the culvert designs. CAM - Please see revised Exhibit 9, page Exh. 9 -64 containing the requested nomograph. 57 — 60a. Items resolved. Rule 2.05.3(5) Topsoil Removal and Replacement 61 -63a. Items resolved. Rule 2.05.3(6) Overburden 63b -c. Items resolved.