Laserfiche WebLink
Page 2 of 3 <br />NECC: Attached are amended pages 2.05 -54 explains that any water bearing zone(s) in the shaft will be ring <br />grouted from the surface. There should be no concerns with using a shotcrete lining since water inflows will be <br />sealed off by grouting. <br />DBMS: It is the Division's understanding from a meeting held between representatives of New Ell-, Coal <br />Company and the Division on April 17, 2012, that the proposed airshaft is to be completely lined with concrete. <br />Please send the necessary amended pages having the proposed airshaft completely lined with concrete. <br />5. It appears that ditch D26 flows into ditch D58. Please provide an explanation on how this is accounted for in <br />the design, including the size of the drainage area. <br />NECC: Ditch D26 does no flow into ditch D58. Clean water ditch D26 flows through two culverts located east <br />of pond 7 and into the river. <br />DBMS: Responses is sufficient. <br />6. A drainage reaches the valley floor approximately 80 feet west of the proposed Bates Shaft in close proximity <br />to the point where ditches D59 and D60 both begin (the up gradient ends). Please provide an explanation on <br />how the flow down this drainage will be directed to D60 rather than D56. (Based on areas in the SEDCAD <br />model, it is apparent that D60 receives these flows.) <br />NECC: The drainage described above will flow into D60. The drainage currently flows in the direction of D60 <br />into culver C80. <br />DBMS: Response is sufficient. <br />7. Please send a revised Table 20, Ditch Data. Some of the values for ditch D59 appear to be incorrect including <br />the peak discharge and the ditch slope; they do not match the values in the SEDCAD printouts. Also, the page <br />number for this table may be incorrect. Should it be 2.05 -1 lb? <br />NECC: The data for D59 located in Table 20 was amended. Attached is revised Table 20 Ditch Data, page <br />2.05 -11a. <br />DBMS: Response is sufficient. <br />8. In Table 21, culverts C79 and C80 are listed as having a minimum diameter of 36 inches. A field inspection <br />from early May 2012 reveals that C79 will need to be replaced to meet this requirement. If this project is <br />constructed, please make sure this replacement is performed. <br />NECC: Comment noted. <br />DBMS: Response is sufficient. <br />9. It appears that a mistake may have been detected on page EXH 19(21) -2. The units for the three year sediment <br />volume should be acre -feet, not cubic feet. Please provide an updated page EXH 19(21) -2. <br />NECC: The units for the three year sediment volume were revised. Enclosed is revised page EXH 19(21) -2. <br />DBMS: Response is sufficient. <br />10. Please provide an updated Map I1 -Sheet 1 to include the temporary DWDA and all other changes from MR- <br />117. <br />NECC: Enclosed is an updated Map 11 -Sheet 1. <br />DBMS: Response is sufficient. <br />