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1 ,_ `. -, .... `- 1 1 1 lJ 1 1--`. 6. Rule 2.04.7(1) requires a description of the ground water hydrology for the proposed permit and adjacent area. Energy Fuels has described a fault system that runs through the proposed permit area. Since they have proposed to under- mine this fault system, and this fault system intersects both Foidel and Middle Creeks, additional hydrologic data will need to be gathered to enable the Divi- sion to reasonably assess hydrologic impacts. Information that needs to be gathered should include subsurface fault mapping, transmissivities and storage coefficients, degree of hydrologic connection between Foidel and Middle alluvial systems and the fault zone, and water quality. When this information is gath- ered, ground water modeling techniques should be applied to the fault zone to assess the hydrologic impacts of the mining proposal. Response: As stated on page 2.04-38, the effect of the fault through the permit area on ground water movement is to locally disrupt the piezometric surface and flow of ground water, as shown on Map l14a, Energy Mine No. 3 Ground- water Hydrology. CYCC has an interest in obtaining the site-specific infor- mation requested, Eor the purposes of mine planning as well as evaluating hydro- logic impacts in the fault zone. In order to obtain the requested information, an expensive and time-consuming program of monitor well drilling, pump testing, water level measurements, ground water sampling and analysis, and application of modeling techniques in the area of the fault zone should be undertaken. However, the Middle Creek Mine is in a dormant state at this time, and a decision has not yet been made as to when the mine will re-open. In light of the present situ- ation, CYCC shouldn't be required to provide this information until a decision is made to re-open the underground mine. During a discussion on June 30, 1981, MLRD stated that this information would not be required to assess possible impacts caused by surface mining, as long as mining does not intersect the fault zone. Therefore, in order to resolve this issue, CYCC wit appli- cation to provide the requested information at leas ninety (90) days prior t resumption of mining at the Middle Creek Mine. Page -I04b'-has-been- sed to include a commitment to provide the requested information at least 90 days prior to resumption of underground mining at the Middle Creek Mine. "~..,5 ~n/a. 0.~ d~gw5s '11.t, 0.~-e.~ c4n5 rnt+ m~ ~- W ~c r.¢.wn t)cw. Nµ.. 7~u ~~.