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Technical Revision (TROT-10) Adequacy Responses <br />Page 4 <br />D2A. In addition, the proposed Addendums 2.05.3-E2A-1 and 2.05.3-E2A-2 in Appendix <br />2.05.3-E2.A do not include proposed Ditch RD-D2A in the Structure Networking for Pond <br />002. Ditch RD-D2A is identified on Map 2.05.3 MIA and Map 2.05.3 M4. Please revise <br />the above referenced tables and SEDCAD Designs to include DitchRD D2A. <br />Response: Ditch RD-D2A is a non-essential ditch that flows into Ditch RD-D2. The watershed <br />area for Ditch RD-D2 includes the watershed area for RD-D2A so that the overall SEDCAD run <br />for Pond 002 is correct, therefore the networking does not need revised. The Structure <br />Networking page has been updated to show that Structure #35 consists of Ditch RD-D2 and <br />Ditch RD-D2A. <br />A SEDCAD design for RD-D2A is included using a conservative runoff parameter of one (1) <br />cfs. Table 2.05.3-E2-5 and Summary Table in Appendix 2.05.3-E2.G-2 have been updated to <br />include the design information for Ditch RD-D2A. <br />12. Table 2.05.3-E2-11 on page 2.05.3-E2.23 in Exhibit 2.05.3-E2 and the Summary Table on <br />page 2.05.3-E2. G-2.33 in Appendix 2.05.3-E2. G-2 identify culvert no. 18A. Culvert No. <br />18A was not identified on Map 2.05.3 M4 or Maps 2.05.3 MIA or MIB. Please revise <br />the appropriate Maps or Tables to include or exclude culvert No. 18A. <br />Response: Culvert 18A is a pre-existing culvert previously approved as permanent in the <br />Seneca II permit. Since this culvert is in place today, but will be removed during the portal <br />construction phase, it was identified on the Tables but not shown on the maps (which show only <br />the operational conditions). To alleviate confusion, reference to Culvert 18A has been removed <br />from the tables. <br />13. Culvert no. 64A and culvert no. SC-9 identified on Maps 2.05.3M1B and 2.05.3 M4 and <br />Maps 2.05.3 MIA and 2.05.3 M4 respectively. However, these culverts are not included <br />in Table2.05.3-E2-11 of Exhibit 2.05.3-E2 and the Summary Table on page 2.05.3-E2. G- <br />2.33 in appendix 2.05.3-E2. G-2. Please revise the appropriate Maps or Tables to <br />include or exclude these culverts. <br />Response: Culverts 64A and SC-9 have been included on the above referenced tables. <br />14. Culverts 15A, 18A, and SC-11 listed on Tables 2.05.3-E2-I1 and the Summary Table on <br />page 2.05.3-E2. G-2.33 and culverts 64A and SC-9 identified on Maps 2.05.3 MIB and 2.05.3 <br />M4 and Maps 2.05.3 MIA and 2.05.3 M4 respectively were not accompanied with SEDCAD <br />design models. Please include hydrologic calculations for culverts 15A, 18A, SC-11, 64A, <br />and SC-9 as needed. <br />Response: Culvert 15A - SEDCAD Design attached <br />Culvert SC-11 - SEDCAD Design attached. <br />Culvert SC-9 - SEDCAD Design is attached. <br />Culvert 64A - This culvert was originally added by Seneca II Mine to control/direct runoff from <br />a portion of the upper warehouse storage area. No design was required, since it <br />was an internal addition; however a significantly oversized culvert was installed.