Laserfiche WebLink
2.04 APPI,IC7iTiLHd FOR PERMIT FcR SURFACE Cat UNDgtC~2OUDID MININ(' ACIZPlTIFS - <br />_ MII4IMUM REQUIREt4aI15 FOR II~MATI~I ON ENVIRC~AtETli7~i, RESOURCES. <br />~\ 2.04.7 Hydrology Description. <br />(1) (a) (i) (ii) (iii) arKl (iv) (Cont'd.) <br />Approximately 360 acres of the more than 5, 000 acres in the permit area <br />were not initially field investigated. This acreage was deemed <br />inconsequential as co~ared to the total area investigated. <br />Stipulation No.'s 26 and 28 were attached to Permit No. C-81-038 and <br />required that right o:E entry information be sulanittad to CKLRD and on- <br />the-ground field veri.Pications of surface water resources be completed <br />for those lands for which right of entry permission had not been <br />obtained prior to undf~r[nining or otherwise affecting the lands. Field <br />investigation of this acreage was addressed beginning in October, 1991, <br />following the establishment of a surface access agreement between CDVCC <br />and the private landa,~mer. The materials required by Stipulations 26 <br />and 28 were submitted to Ci~IId2D as part of the permit revision <br />application addressing the additional lands included in the permit as <br />a result of the acquisition of Lease COC-53356. <br />Because of the mine fire if June 1. 1986, Ci4I determined the need for <br />an alternative access; to coal reserves. CWI identified potential <br />portal site areas acid belgan detaile3 hydrologic studies in these <br />specific areas. CWZ contracted the services of Hydro-Geo Consulting, <br />Inc., of Wheatridge Colorado, to evaluate the hydrology of the new <br />~'~ portal area. The study area was concentrated in the East Roatcap <br />drainage area where the new portal site for the Orchard Valley West <br />Mine is located. Detailed information on the method of study and a <br />description of grour~~rater is contained in the Hydrology Appendix in <br />I Volume 4. <br />Generally, the method of the study was similar to that performed for <br />the Orchard Valley Mine site. ITrill holes used to locate the coal <br />reserve were converted to piezometers to measure groundwater conditions <br />and also rising head and falling head tests were performed to evaluate <br />permeability. ResuU's of these tests are also contained in the <br />Hydrology Appendix in Volume ~!. <br />(b) The subsurface hydrol x~ic regime may be divided into four discrete <br />subsystems: the a1lLVium and terrace deposits associated with the <br />North Fork of the Gunnison River; localized deposits of alluvium- <br />colluvium within the Steven's Gulch, Terror Creek, and Roatcap Creek <br />drainages; groundwater occurrences within the Mesaverde Formation; and <br />colluvial discharges associated with soil moisture storage. <br />North Fork of the Glue-~ison River Alluvium <br />Alluvial fill associat°ci with the North Fork if the Gunnison River and <br />tributary drainages (Terror Creek) <br />PR 93-03 <br />Revised 04/17/93 <br />30 <br />