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L <br />i- <br />!- <br />~•.I A'Il ~)I f:01 L)rf AIM nn'iingll U.I nM•w~~~~••~ <br />• DEPARTMENT OF NATURAL RESOURCES <br />Harris D Sherman. E~eculive Dir eclor <br />1ViINlf;U LAND I{If;1;I.A1~9A'I'IUN <br />723 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 60203 Tel. (303) 6393567 <br />Hamlet J. Barry, II I, <br />Director <br />MEMORANDUM <br />T0: Roger Funston <br />FROM: Jerry Zimpfer <br />DATE: February 22, 1980 <br />RE: Hydrology for Empire Energy Company (October 1979 submittal) <br />Sorry that this review took so long, but this is the first review we have <br />performed on an underground mine under the proposed permanent regulations. <br />Earlier hydrologic reviews concerning sediment control and the silo were <br />conducted under interim regulations and therefore certain aspects such as <br />AVF, cumulative hydrologic impacts, and others have not been previously <br />considered. <br />This review has been conducted under the permanent regulatory program as <br />published March 13, 1979. <br />BASELINE HYDROLOGY - The application relies upon existing data from <br />Utah International and the USGS to describe the surface and groundwater <br />systems. Although providing a general overview of the area, this infor- <br />mation does not contain the specificity required in an application under <br />the permanent program. The following site specific information should be <br />provided to enable the applicant to make a comprehensive determination of <br />the probable hydrologic consequences. <br />1) Ground water movement at the minesite is poorly understood. <br />a) Provide piezometric surface maps for each of the bedrock aquifers <br />(Trout Creek Ss, Twenty mile Ss, P4iddle Ss, and the coal aquifers). <br />b) Provide water table maps for the Williams Fork and Yalnpa alluvial <br />aquifers. <br />c) Page III-10 of the application reports the existence of two <br />small faults. Show these faults on a map. Identify the hydrologic <br />properites of these faults, and describe their role in local ground <br />water movement. <br />d) The text assumes no vertical movement between aquifers. This <br />contrary to the setting illustrated in drawing IV-51. Provide evidence <br />such as pump test to support the conclusion of no vertical movement. <br />2) Identify the recharge and discharge areas for each individual <br />