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RBSPONSfi TO JUNE 6, 1994 TR-07 ADfiQUACY RSVIfiW L6TTSR The review letter found that moat of the questions that the Division had about the permit were answered adequately. Only those issues related to the McClane Canyon Mine that require further responses are addressed in this letter. GVC will be submitting a revision to the Munger Canyon Mine Permit by July 20, 1994. 8. Page 4-33 has been revised to show that the Wildlife Monitoring Plan was terminated on August 12, 1983. 14. Page 4-4 has been revised to state that the direction of dip is Northeast. Also refer to Page 4-7, Section 4.2.1; Page 2-61, Section 2.5.2 and numerous other sections in the permit that describe the geologic conditions. 15. Pages 4-4 and 4-4a have been revised to include the response to this question. 16. Grand Valley Coal company feels that a potentiometric surface map for the permit area should not be required. Since the permit was originally issued in 1982, the application has been renewed five times. The application has also been subjected to five midterm reviews. The midterm reviews are essentially a complete review of the permit; as is evidenced by the thoroughness of this midterm review. In each of the previous reviews, the Division has determined that there will be no significant impact to the "aquifer" without requiring the potentiometric surface map. GVC has provided Figure 4.2-3 showing the approximate boundary between the saturated and unsaturated zones of the Cameo Coal Seam. GVC is uncertain why this baseline information is being required now to determine if there will be impact to the hydrologic system ? Additionally, GVC has demonstrated that the quality of the groundwater is so poor that its usefulness can not be impacted. Rule 2.04.07(1)(a) requires that a description of the ground water hydrology for the proposed permit and adjacent area be included in the application. Rule 2.04.07(1)(a)(i) requires a description of the depth below the surface end the horizontal extent of the potentiometric surface of each aquifer above, within, and below, if potentially impacted, below the lowest coal seam to be mined. These descriptions are presented in the application. As detailed elsewhere in this midterm review there are no aquifers above the coal seam to be mined. There is a perched aquifer in the area of the graben at McClane Canyon, but no further mining is planned in this area. Aquifers below the mine will not be impacted and have not been penetrated by sufficient drill holes to evaluate their characteristics. Mc Page - 2 7/12/94