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J. J. Dudash -5- April 25, 2007 <br />and B-B. The full flow depth as written in the Detailed Discharge Table as <br />6398.25 ft is correct and can be correlated with the Emergency Spillway cross <br />section on Map 39. This depth shows the emergency spillway carrying the 25- <br />yearevent. <br />16. DRMS: In reviewing the Pond HC Plan View and Section 8-L3' Shaft Sediment Pond <br />on Map 39, what is to prevent surface runoff from the Hubbard Creek road ditch or from <br />the adjoining area from entering sediment pond HC through the emergency spillway? <br />BRL: A water bar will be installed on Hubbard Creed road, please see Map 39 <br />for location of the water bar. <br />17. DRMS: Please provide a copy of the NPDES permit for pond HC when it is <br />obtained. As a reminder, if the NPDES permit only pertains to the treatment of surface <br />runoff, then no ground water that is encountered in the construction of the vent shaft or <br />mine water can be treated in the sediment pond. <br />BRL: Comment noted. <br />18. DRMS: In the Elevation-Capacity-Discharge Table on page Exh-8-2-17, the area is <br />designated as being in acres but the values appear to be in square feet. Likewise, in the <br />same table, the capacity is listed as being in acre-feet but the values appear to be in <br />cubic feet. Please clarify. <br />BRL: See revised page Exh-8-217, the areas have been revised to reflect acres <br />and the capacity is now acre-feet. <br />Rule 4.05.2 -Water Quality Standards and Effluent Limitations <br />19. DRMS: What plan will BRL use to deal with any water encountered during <br />construction, either from ground water or from the rock drill water used in construction? <br />BRL: See revised page 2.05-67. <br />Please feel free to contact me if you have any questions. <br />Sincerely, <br />~~` <br />J. E. Stover, PE <br />Consulting Engineer <br />Enclosures: <br />Volume 1 - 2.05-67, <br />Volume II -Table of Contents, Map-39 & New Map18-1 <br />Volume III -Pages Exh-8-212,213,217,218 <br />