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<br /> <br /> <br />Mr. Rick Mills -6- September 15, 1993 <br />a. 93-OO1M, 93-002M, 93-AYM-1, 93-AVM-2, MC-1 are not shown on Map 13A. <br />b. Why are FO-1 and FO-2 within 100 feet of each other? <br />c. If baseline data currently exists for any of these wells please <br />submit it. For wells to be established, provide a schedule for <br />installation and baseline data submittal. <br />3. The zone of increased permeability can range from 30t to 60t. Given a <br />coal extraction thickness of 9.5 feet a zone of increased permeability <br />can exist up to 570 feet above the coal seam. This would encompass the <br />Middle Creek alluvial aquifer fora considerable distance in the <br />northeast portion of the Eastern Mining District. However, TCC concludes <br />that 340-380 feet is the maximum extent of surface or groundwater <br />impacts. Please explain this discrepancy. <br />4. The Foidel Creek Schoolhouse is shown in an area to be subsided. <br />Conversations subsequent to PR-03 submittal indicate the contrary. <br />Please clarify with affirmative permit text and correct all maps if <br />appropriate. If subsidence is proposed, a mitigation and control plan is <br />required. <br />5. Structures are noted in the north 1/2 of Section 28 TSN, R86W. For <br />subsidence inventory purposes, structures are defined as all man-made <br />objects such as buildings, bridges, roadways, soil embankments, spoil <br />piles, water holding and transportation facilities, pipelines, <br />powerlines, etc. Renewable resource lands include aquifers, aquifer <br />recharge areas, agricultural or silvicultural--- production of food and <br />river and pasturelands. Please ensure all structures and renewable <br />resource areas within the permit and adjacent area are addressed by a <br />brief text description and are spotted on a map. <br />6. It is the Division's understanding that with this application (PR-03), <br />TCC is proposing no material damage to any structure or renewable <br />resource land. If this is not the case please clarify. <br />Additional Adequacy Concerns <br />The subsidence data submitted by TCC and SubTerra is currently being <br />evaluated by the Division's geotechnical staff. Any questions or <br />concerns will be forwarded to TCC as soon as possible. The Foidel Creek <br />mine subsidence report for the 1st half of 1992 was received incomplete <br />on 9/15/92. Fish Creek subsidence data, in particular, was not submitted <br />as required. No subsidence issues can be resolved at this time. <br />2. The maximum calculated slope change on Middle Creek is .019 ft/f t. Is <br />that total over the entire length? Where will ponding occur? Where will <br />headcutting occur? Figure 1 was not submitted for identifying stream <br />profile locations. Please provide Figure land additional details <br />concerning stream channel subsidence. Subsidence contours over Foidel <br />and Middle Creeks are necessary over the lengths that they will be <br />subsided. <br />