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New Elk Coal Company <br />5. DRMS — Please include a description of the road procedures referring to as the RDA <br />Haul Road <br />NECC — included is a new copy of the Haul Road Procedures and Pages 2.05 -7a <br />thought 7d were revised <br />6. DRMS — No action is necessary <br />7. DRMS - Exhibit 19(25) seeks to determine the effect of adding a new culvert (C 19) <br />which will divert flow to the north of the main mine haul road, from the south -east <br />corner of the 4- way intersection, and reduce the discharge volume traveling through <br />the "C 16 system ". The exhibit cites flow values from tables 20 and 21, and also <br />updates those tables with revised calculated values for the structures affected. <br />a. The flow through C19 is equivalent to the flow through C9, the value for which is <br />taken from table 21(2.71 cfs). On inspection of Map 13, C9 conveys the flow of <br />ditch D6. According to table 20, the flow through D6 is 3.98cfs. Please check the <br />calculations for C9 and D6, updating the exhibits and tables as appropriate. <br />NECC - The flow in C9 was changed to 3.98 cfs which is the flow in D6. <br />b. The flow for D 15 is both cited and updated. The value cited from table 20 is <br />8.75cfs. On inspection of Map 13, D15 conveys the combined flow of C8 and <br />D13 (table values of 3.77 and 0.59cfs, respectively) which equates to 4.36cfs. <br />Please check the calculations for C8, D13 and D15, updating the exhibits and <br />tables as appropriate. Since the discharge volume of D15 is being updated it would <br />be preferable to amend Exhibit 19(25) to cite C8 and D13 instead. <br />NECC - The flow in D15 does carry the combined flow of C8 and D13. D15 also has <br />a drainage area that would increase the flow. NECC believes the citation for D 15 in <br />Exhibit 19(25) is correct. <br />c. The flow for C13 is given as 10.75cfs, and is cited as the combined flow of <br />ditches D 12 and D 14. The table values for these three structures are 8.27, 8.75 <br />and 6.83cfs, respectively. Since none of these values are in agreement, ditch D14 <br />was the subject of a recent Notice of Violation, following a breach of the ditch <br />into the Purgatoire River, these values should be reconciled. Please check the <br />calculations for D 12, D 14 and C 13, updating the exhibits and tables as <br />appropriate. <br />NECC - Upon further review, the flow values for D 12, D 14 and C 13 are incorrect. <br />The designs for D 12, D 14 and C 13 were last updated by Exhibit 19(23) as part of <br />MR -112. The flows calculated in MR -112 are D12 (9.67 cfs), D14 (7.85 cfs) and 10 <br />year event C 13 (12.14 cfs). <br />