2010-07-16_REVISION - C1981019 - Laserfiche WebLink

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are 9, 16, the east quarter of 17 and the north half of 21. Several of the post-mining drainages, however, are not duplicated on Maps 41 and 41 A. This has led to several inconsistencies between the approved Map 41 and the proposed changes to the East and West Taylor Fills, South Taylor Mine Plan and South Taylor post-mining topography (as shown on Maps 19B, 23A and 41 A). The following are the inconsistencies between the approved Map 41 and the changes proposed on Map 41A that need to be fixed. Since the mining areas cross-over, the Division requests that all common drainages from Sections 9, 16, 17 and 21 are shown on both maps. Additionally, the Division recommends making a notation following the ditches common to Maps 41 and 41 A to instruct the viewer that these ditches are shown on both maps. a. On the currently approved Map 41 the Taylor Tributary Ditch flows from the top of the East Taylor Fill through the West Pit and into the East Taylor Pond. The approved toe of the East Taylor Fill is at approximately station 87+00 of the Taylor Tributary Ditch. The proposed toe of the East Taylor Fill will put it at approximately station 80+00 of the Taylor Tributary Ditch. Additionally, the proposed plan for the East Taylor Fill does not call for the Taylor Tributary Ditch to flow down the middle of the East Taylor Fill. Rather, the East Taylor Fill will drain into the East Taylor East Tributary Ditch and the East Taylor West Tributary Ditch. There two ditches will then flow into the Taylor Tributary Ditch (and ultimately into the East Taylor Pond). Please redesign the Taylor Tributary Ditch to correct its length and location for the proposed toe of the East Taylor Fill (Map 12 and Map 33A will also need to be updated with this redesign). Please provide new SEDCAD modeling for the redesigned Taylor Tributary Ditch. Please include the new fill design on Map 41 as well as the portions of the East Taylor East Tributary Ditch and the East Taylor West Tributary Ditch that appear on Map 41. Please include the portion of the Taylor Tributary Ditch that appears on Map 41A. Please provide new SEDCAD modeling for the East Taylor Pond to reflect the changes to the Taylor Tributary Ditch, the East Taylor East Tributary Ditch, the East Taylor West Tributary Ditch, the East Taylor Fill and the changes to the post-mining topography on and around the East Taylor Fill. b. The West Pit Ditch intercepts the Taylor Tributary Ditch at approximately station 78+00. This intercept location is just below where the East Taylor Fill will toe out (at approximately station 80+00 of the Taylor Tributary Ditch). Please review the location of the West Pit Ditch to ensure its location will not be affected by the proposed toe of the East Taylor Fill. Please add the West Pit Ditch to Map 41A. c. Map 41 shows the Section 16 Taylor Ditch (Version 2). This ditch is located in the southwest corner of the map and is above (topographically) the East Taylor Fill. The approved design of the ditch appears to have it draining into an area above the fill and, ultimately, into the Taylor Tributary Ditch. This ditch is not shown on Map 41 A. As discussed in "a" above, the proposed design for the East Taylor Fill has the runoff flowing into the East Taylor East Tributary Ditch and the East Taylor West Tributary Ditch and, ultimately, into the Taylor Tributary Ditch. Based on the proposed plan it appears that the Section 16 Taylor Ditch