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i <br />s-Y ~ • • <br />Mr. Larry Reschke -4- January 13, 1982 <br />Additional information could be required during the review process. The <br />data requirements might be less for Alluvial Valley Floors located adjacent <br />to the permit area. <br />The application should also include a plan to monitor the hydrology and <br />productivity of the Alluvial Valley Floor as required under Rule 9.24. <br />The above information would be used, along with the applicant's statement <br />of Probable Hydrologic Consequences, to make the reguired'statutory <br />findings prior to a permit being issued. The required findings (Rule <br />2.06.8(5)(a)) are that the proposed coal mining operations would not <br />interrupt, discontinue, or preclude farming on the Alluvial valley Floor, <br />unless..., and that the proposed surface coal mining operations would not <br />materially damage the quantity and quality of water in surface and <br />ground water systems that supply those Alluvial valley Floors or portions <br />of Alluvial Valley Floors... <br />The applicant should be made aware that if t)~ese findings cannot be made <br />by the Division, mining in or adjacent to an Alluvial Valley Floor (this <br />includes mining beneath) would be denied. <br />Underground Development WasCe (Rule 2.05.3(9)) <br />The slope stability analysis of the proposed expanded waste disposal pile <br />satisfies the concerns expressed in the PreliminanJ Adequacy Review <br />letter of May 8, 1981. <br />The stability analysis did not reference the installation of ground water <br />monitoring wells. Such wells would be required to monitor quality and wafer <br />table evaluation below the proposed disposal pile. The location of Test <br />Hole -2, depicted on the drawing entitled "Test boring Location Diagram", <br />included in Volume 6 of the amended application, represents an acceptable <br />location for such a monitoring well. If that test hole has not been back- <br />filled, it could be appropriately and completed to use as a ground water <br />monitoring well. <br />Subsidence (Rule 2.05.6(6) and 4.20 <br />one potentially major deficiency and several minor deficiencies remain within <br />the subsidence sections of the application. <br />1) "Potential Impacts Upon the Hydrologic Balance of i <br />The surficial aquifer of Ward Creek will be undermined by the proposed under- <br />ground workings of the Red Canyon No. 1 and No. 2 mines. Severe roof stability <br />problems were encountered while driving the No. 1 west submains toward Ward <br />Creek in the southwest quarter of the northeast quarter of Section 11. The <br />company informed the Division by telephone and Ietter of this difficulty <br />and requested permission to drill 2 exploratory drill holes. The results of <br />that coring project were to be used to redesign the mining plan. These <br />