Laserfiche WebLink
<br /> <br />• SENECA II PERMIT C-BO-005 <br />Technical Revision 32 <br />Response to Division of Minerals and Geology <br />06/05/98 Adequacy Letter <br />August 4, 1998 <br />1. As was discussed earlier with the Division staff, SCC will <br />address Stipulation No. 32 in a separate revision. The revised <br />postmining road location we incorporated into this revision <br />was done since this is where the final road needs to be to <br />have access to the radio towers atop Chavez Peak. SCC has <br />shown this plan to the appropriate landowners and they have <br />given us their approval of the location depicted on Exhibit 7- <br />19. SCC will revise and submit Exhibit 12-9, Postmining <br />Topography, with the other technical revision information <br />required under Rule 2.05.4(2) this fall. <br />2. The 1200-foot segment of road ditch between culverts 19A and <br />24A is nearly flat. Runoff from the regraded road area is <br />expected to be limited to minor sheet flow, consequently a <br />ditch would not be required to control drainage. <br />3. Once the road is regraded, all that will remain will be a <br />narrow light-use road. Disturbance associated with the final <br />• road will be insignificant compared to the overall drainage <br />area. In addition, given that the regulations do not require <br />ditches for light-use roads, this approach appears to be <br />consistent with accepted drainage control practices. The <br />current road-side ditches will be maintained until reclamation <br />is completed. <br />4. SCC acknowledges that there are a number of small areas <br />throughout the mine site that have not been reclaimed at this <br />time. It would, however, be difficult and overly conservative <br />to try to account for these minor areas. SCC has focused on <br />those major disturbance areas that are significant relative to <br />postmining drainage designs. These areas are indicated on <br />Exhibit 7-19, Postmining Drainage Control Map. In just a few <br />years all areas, both major and minor, except for the <br />remaining light-use roads will be reclaimed and revegetated, <br />significantly reducing runoff and flow to levels well below <br />the conservative design basis. Given these practical <br />considerations, SCC's postmining drainage design, focusing on <br />significant major drainage areas and using conservative <br />assumptions, should be considered adequate. <br />5. During reclamation of the haul road, culverts 19A, 24A, and <br />45A will be replaced with dry stream crossings. A figure is <br />included with these responses for insertion at the end of <br />Appendix 7-12 which shows the design of the dry stream <br />• crossings. SCC proposes to leave the remaining culverts in <br />place. These culverts are in areas that have already been <br />