2014-11-21_REVISION - C1996083 (4)

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Susan Burgmaier -5- November 18, 2014 ditches and discharge from Ponds C & D. The TR -84 flow of 23.35 included the mine water, 0.5 cfs, but did not include the Clean Water drainage area flows of 0.88. The TR -84 flow should have been 24.23. Revising the flow down for TR -91 is 24.23 cfs minus 0.5 cfs = 23.73. The label for Ditch H -1 has been added to Map 21 -3. 9. DRMS: The Division's requested design information or clarification that certain structures are not mine related. After reviewing BRL's September 24, 2014 response, we have the following comments: • Issue resolved • 18" culvert near pond diversion structure along main haul road — BRL indicated that the culvert had been designated as C -G6 and relocated with TR -87. The Division might not have made clear which unnamed culvert was in question. On Maps 15 -2 and 21 -2, there is an unnamed 18" culvert located at the diversion structure that directs flow to Pond B or Pond C, along the main haul road. Please provide design information or clarification regarding the 18" culvert located near the Pond B /Pond C diversion structure. BRL: This structure (G6) was revised with TR -87 and will be incorporated into upcoming revision to be submitted by January 15, 2015. • Item Resolved. • 36" culvert on the D Bench — BRL identified the culvert as C26 on Map 15- 2 and provided design information as requested. Please update Map 21- 2 to include a label for Culvert C26, and add Culvert C26 to the Culvert Summary table on page EXH -8 -31. BRL: Culvert C -26 is currently shown on page EXH -8 -31. Map 21 -2 has been revised to show the label for Culvert C -26. • Item Resolved. • Item Resolved. • Item Resolved. • ADS drain into Ditch C12 —BRL identified the culvert as supplemental. Please provide additional information on the ADS drain that drains Spring S -8, including its purpose and when it was installed. If the drain has been installed in support of mine facility or road