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51GTE OF CG_O~G'?O 5rt'~.aan o. ~a•.t :~ Gr.vr•nr~ III III III III IIII III <br />DEPARTMENT OF NATURAL RESOURC ES 999 <br />Harms D. Sherman. Executive Director <br />~1LNED L.a\D REC:LA11'~'I'10\` <br />723 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. 13031 839-3567 <br />Hamlet J. Barry, II1, <br />Dire~KOr <br />M E M O R A N D U M <br />T0: Roger Funs ton <br />FROM: Jerry Zimpfer <br />DATE: February 22, 1980 <br />RE: Hydrology for Empire Energy Company (October 197:3 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 HYDROLOG`(- The application relies upon existing data from <br />Utah International and the USGS to describe the surface and groundwater <br />systems. Although orovid~ng 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 follo~:ing site specific information should be <br />provided to enable the applicant to ,~~ake a comprehensi•ue 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 tlTe bedrock aquifers <br />(Trout Creek Ss, Twenty mile 55, Puddle Ss, and the coal aquifers). <br />b) Provide water table maps for the Williams Fork and Yampa 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 />(rnnt'd) <br />