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I• <br />~~ <br />L_.J <br />~~~ <br />u <br />Table 12-6 .2 <br />Ditch Design Summary <br />Ditch <br />1 <br />2 <br />3 <br />3A <br />4 <br />5 <br />6 <br />7 <br />6 <br />A <br />9 <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 HGTZ <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />No <br />No <br />Yes <br />Yes <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 />crusher belt conveyor immediately east of the crusher building, see Exhibit <br />12-2, Surface Water Control Plan Map. <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 is 12-inches in <br />diameter and 7-feet long. The 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 <br />and the design information for it is contained in Appendix 12-9. <br />Therefore, the design parameters for culvert LFC-2 can apply to the walkway <br />culvert. Since both culverts are the same size, the walkway culvert should <br />not restrict the design of Ditch 3, that the performance of the ditch has <br />not been compromised by the culvert, and the culvert is adequately sized. <br />TR-07 <br />12-9.3 <br />Revised 03/06 <br />