Laserfiche WebLink
<br />37 Please add to the application a slope stability analysis for sediment pond embankments. Use <br />• embankment height of 10 feet (emergency spillway crest to base of dam), a top embankment <br />width of 12 feet, with a static water elevation against the embankment of 7.5 feet (worst-case of <br />the sediment ponds described on Figure EX 15-14). Please include in your analyses that all <br />ponds aze on slopes less than the ] 0% of the example analysis. <br />tJ~? <br />1' f ' ~ Response -The attached CTLlI'hompson letter report confirms that the specified sedimentation <br />1~ ;'~ __y~ pond embankments are stable at slopes less than ] 0 percent. <br />N 6`- 38' lease state whether blasting will be required for the Lorencito Canyon contour operation. !f <br />please provide the information required b}• Rule 2.05.3(6)(a)(i) specific to the contour <br />operation. <br />Response -Most of the overburden removal for the Lorencito Canyon Surface Mine will be done <br />without blasting because the coal seams are thin, and it is desirable to minimize the potential to <br />,,I dilute the coal quality. The blasting procedures described in pages 2.05-36 through 2.05-39 for <br />~~)UV,61`+ the Jeff Canyon Surface Mine will also apply to the contour operation on those occasions when <br />V ~ blasting is required. The maximum blast of 72 holes will not be exceeded at the contour <br />operation. <br />39 he Division notes that the proposed post-mining topography for the contour mining area is <br />exact replica of the pre-mining topography (excluding the excess spoil fills). If this is not the <br />proposed plan, please address this potential issue. <br />• Response - LCC proposes to establish the post-miming contours as approximate original <br />0 ~ contours as indicated on Map 2.05.4-1. <br />Rule 2.05.4 Reclamation Plan <br />40. Please address the requirements of Rule 2.05.4, in particular 2.05.4(2)(a) and (b). The <br />~metable should be directly linked to the estimate and give specific details on the tasks involved <br />~~1~for each area. Please include details for each area separately and specific to each portion of the <br />reclamation plan. <br />Response - A revised reclamation timetable and cost estimate will be submitted to the Division <br />as soon as it is available. <br />41 Please remove all text and other permit materials that refer to the rail spur (e.g. page 2.05- <br />)• <br />^'v Response -Page 2.05-59 (and others) have been revised to remove reference to the rail spur. <br />\ -~,U~1 41 Means Heavy Construction Cost Data from 1996 is not acceptable. Please use current <br />O eans data for all tasks included in the detailed estimate. <br />• <br />