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INTEROFFICE MEMORANDUM <br />TO: ZACH TRUJILLO <br />FROM: ROB ZUBER 9 �) 2 <br />SUBJECT: NEW ELK TR 66, PRELIMINARY ADEQUACY REVIEW FOR HYDROLOGY <br />DATE: 6/29/2012 <br />Zach — <br />I reviewed the drainage plan, design and modeling ( SEDCAD) for the TR -66 application. There are only two <br />small items: <br />1. There is an error on Map 13. There is an additional culvert "C -A" near the bottom of the haul road to the <br />RDA. <br />2. In the SEDCAD model, flow into Culvert 81 should be for the 100 -year runoff rather than the 10 -year <br />runoff. <br />- Rob <br />