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Draft West Elk Mine 2005 Annual Hydrology Report 41 <br />-i i tF ~ M t i~ .~ 3 .t' r <br />J`anuary~tl±l98) the hydro~ogtr,~tronrtoFmgprogram to WI'E`200~remaar~ed the~same as ,~ '210 <br />Wifh~the'exception, of adduignFtve ne°w sut~ace tnon>tormg Stahons~(Sectronn3„"1'), foui~re~spring <br />v~ ~- o ~_ ~ ,~ _ _. <br />mgnttonng~staf~ons_(~4ectton 3 2),'and fourn~wmonttormg~Yells(~ectrpn 3~)` <br />6.1 Mining Related Hydrologic Impacts <br />Since 1999, there have been no mining related hydrologic impacts reported in surface water or <br />spring resources in the western Project azea, specifically the Gribble Gulch area (WWE, 2000, <br />HydroGeo, 2001, HydroGeo 2002, HydroGeo, 2003, and HydroGeo, 2004). Gribble Gulch was <br />undermined from 1995 to 1997, therefore, future mining related hydrologic impacts in this area aze <br />not anticipated. <br />)n WY 2005 the West EIk Mine hydrologic monitoring program was conducted in accordance with <br />all permit and contractual stipulations. The data collected were adequate to assess potential <br />Project-induced impacts to the area's hydrologic system, with the exception of data collected at <br />three surface water stream stations and five monitoring wells. <br />The data collected from the Upper Deep Creek, Lower Deep Creek, and Upper Dry Fork surface <br />water monitoring stations in WY 2005 are not reliable, due to naturally occurring erosion and <br />sediment deposition resulting in continuously changing stream bed characteristics. Pressure <br />transducers and data loggers were installed in the open stream channels at the Deep Creek stations. <br />Control channel sections were established at each site in 1996, however flumes were not installed <br />at these locations in order to limit impacts based on U.S. Forest Service concerns. The Deep Creek <br />stream channel is very dynamic and has changed considerably since the sites were established. As <br />a result of erosion and sediment deposition, the control channels used to calibrate the pressure <br />transducers and gauge the stream flows are constantly changing and the flow data collected for <br />Deep Creek in WY 2002 (HydroGeo, 2003), WY 2003 (HydroGeo, 2004), WY 2004 (HydroGeo, <br />2005), and WY 2005 (HydroGeo, 2006), aze not considered reliable. The data and graphs <br />September 2006 HydroGeo, Inc. <br />