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0. <br />III IIIIIIIIIIIII III <br />1NTEROFFiCE MEMORANDUM <br />TO: BYRON WALKER <br />FROM: JANET BINNS ~ <br />SUBJECT: MINE NO. , C-8 <br />DATE: 05/04/99 <br />CC: [CLICK HERE AND TYPE NAME] <br />Colorado Yampa Coal Company has submitted SEDCAD4 runs for the permanent <br />ditches at Energy Mine No. 3 in response to the Division's request. The request for this <br />information originated from the Division's Midterm review dated, October 20, 1998, <br />Item No. 13. This identified concern is repeated here: <br />13. A statement is made on page Exhibit 3-11 that diversion ditches were designed with a <br />minimum freeboard of 1.0 foot. However, freeboazd design information was not <br />found in the permit (Exhibit 3) for ditches; stockpond diversion, P-I(b), P-1(c), P- <br />1(d), P-3(b), Office Perimeter, F-2, and H-3. The depth ofditch P-1(b) is 0.80 foot, <br />0.71 foot for ditch P-1(d) (page 3-25(a), and 0.63 foot for ditch P-3(b), which is in <br />conflict with the overall design statement on page Ex. 3-11. Please demonstrate, in <br />this exhibit, that all ditches have the required 0.3-foot of freeboard. (Rule <br />4.05.3(7)(b).) <br />Please review Colorado Yampa Coal Company's submittal and let me know if it aswere <br />all concerns. <br />Thank you <br />