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_ _ __ N~ .vSr.- ~! _ _ <br />III III III'll llll III <br />999 <br />rfErloRANDLRI <br />DATE: march 26, 1982 <br />T0: Carol Russell /r <br />FROhI: David Craig I <br />r j. lll/// <br />RE: lst Draft of CHIS - Ground Slater for the Canon Citv Coal Field. <br />Pursuant to your request, here is a first draft of the Cumulative Hydrologic <br />Impact Statement (CHIS) for ground water in the Canon City Coal Field. The <br />surface water portion of this document will be forthcoming upon the <br />completion of Jerry Zimpfer's review of the stream diversion situation. <br />Please review this document and comment accordingly. <br />Sections 34-33-110(2)(1) and 34-33-114(2)(c) of the "Colorado Surface <br />Coal Mining Reclamation Act" require that the Division make an assessment <br />of the probable cumulative hydrology impacts of all anticipated mining <br />in the area of a proposed mining operation. This cumulative impact <br />assessment is for all current and anticipated mining in the Canon City <br />Coal Field, in Fremont County, Colorado. This includes the following <br />mines: Dorchester, GEC Strip, Newlin Creek, and Twin Pines. A map <br />prepared by the Colorado Inactive Mine Reclamation Program (1982) shows <br />the locations of these mines. Also shown on this map is the locations <br />of the many mining operations that occurred in the past that are now <br />inactive. The remainder of this assessment will be subdivided into a <br />"Ground Water" section and a "Surface Water" section. <br />Description of the Existing Environment <br />Ground Water <br />All of the mining operations considered in this assessment are located near <br />the axis of the Chandler Syncline. The strata generally dip to the <br />southwest at about 6° - 10°. All of the mining is taking place stratigraphically <br />in the middle portion of the Cretaceous Veremejo Formation. Eleven coal <br />seams occur in this formation and have thicknesses ranging from 1 to 11 <br />feet. The mines are generally located at or near a coal outcrop. The <br />existence of many unreclaimed spoils and waste piles has greatly altered <br />the natural topography. <br />