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~1 <br />Ditch <br />1 <br />2 <br />3 <br />3A <br />4 <br />5 <br />6 <br />7 <br />8 <br />A <br />9 <br />Table 12-4.2 <br />Ditch Design Summary <br />Walkway Culvert Design <br />During the 1995 midterm review of this permit, the CDMG requested a design <br />be submitted for an existing, unnamed culvert that is located under the <br />conveyor belt between the crusher building and the conical stack tube near <br />the sump pump, see Exhibit 12-2 Surface Water Control Plan Map. <br />Status <br />Existing <br />Existing <br />Existing <br />Existing <br />Existing <br />Existing <br />Existing <br />Existing <br />Existing <br />Proposed <br />Existing <br />Redesigned by HGTI <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />This culvert actually lies in Ditch 3 and acts as a walkway to cross the <br />ditch and get to the sump pump. The existing culvert has a 12-inch <br />diameter and is 7-feet long. She culvert in question also allows runoff in <br />Ditch 3 to flow through it and continue to designed culvert LFC-2, which is <br />immediately downgradient Culvert LFC-2 is also a 12-inches in diameter and <br />the design information for it is contained in Appendix 12-4. Therefore, <br />the design parameters for culvert LFC-2 can apply to the walkway culvert. <br />Since both culverts are the same size, the walkway culvert should not <br />restrict the design of Ditch 3, that the performance of the ditch has not <br />been compromised by the culvert, and the culvert is adequately sized. <br />TR-06 <br />12 -9.3 <br />Revised 11/09 <br /> <br />