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© trenched azea was an existing road or other existing disturbance area, the disturbed <br />configuration will be reestablished if needed for future operations and the area will not be <br />immediately reclaimed. For other exploration disturbance areas, reclamation will be completed <br />by scarifying the regraded surface, redistributing stockpiled topsoil, and reseeding the azea <br />using the following seed mixture: <br />S ecies Broadcast Seedin¢ Rate <br />Western wheat grass 2.0 lbs PLS/acre <br />Slender wheatgrass 1,0 <br />Mountain brome 2.0 <br />Sandberg bluegrass 2.0 <br />Lewis flax 0.12 <br />Western yazrow 0.12 <br />Yellow sweetclover 0.75 <br />Fourwing saltbrush 1.0 <br />Project•SDeci~c Plans and Parameters -The proposed exploration activities will consist of <br />trenching to locate and delineate the D-seam coal outcrop in Elk Creek Canyon, the <br />completion of up to twelve exploration drillholes, and collection of core samples from the <br />drillholes co chazacterize the D coal seam, associated roof and floor materials, and geotechnical <br />conditions associated with proposed D-seam development and mining operations. All of the <br />proposed exploration activities aze within the permitted azea and will utilize existing roads for <br />access. Exploration disturbance will occur either on the roads or in existing disturbance area <br />such that no additional surface disturbance will be required. The proposed exploration sites <br />and activities are graphically illustrated on the attached Exhibit A-1. Exploration activities may <br />be in,ciaced as early as May 1998 and aze expected to be completed by the end of September <br />1998. <br />Trenching is required to locate the D-seam outcrop as a basis for location and design of new <br />portals to access the D-seam. Proposed trenching will occur along the existing light-use road in <br />Elk Creek Canyon with excavation of up to 200 feet of trench to a depth of approximately 20 <br />to 25 feet. The trench will be backfilled and the road reestablished immediately following <br />exposure and inspection of the coal seam at outcrop. Trenching will occur during low flows <br />and berms and/or silt fence will be used to prevent excess sediment contributions from the <br />exploration disturbance area to Elk Creek. <br />Exploration drillholes will be drilled using diamond core and rotary drilling methods with <br />drillhole depths ranging from approximately 100 to 800 feet. In order to avoid potential <br />sample contamination, drillholes will be completed to the extent possible with air, air•foam, or <br />water as the circulation medium. If drilling muds aze necessary co maintain circulation and <br />drillhole integrity, polymer muds which are free of metallic compounds will be utilized. It is <br />anticipated that minor amounu of water may be encountered below the E coal seam and that <br />the D coal seam interval may be partially to fully saturated below iu outcrop in the Elk Creek <br />Valley. Upon completion of drilling and recovery of core samples, drillholes will be plugged <br />and sealed, and the associated disturbance azeas returned co their prior configuration and use in <br />accordance with the methods and procedures outlined in Section 2.02 of the Regulations of the <br />Colorado Mined Land Reclamation Boazd. If it is advantageous to complete any of the <br />drillholes as monitoring wells, OMI will provide the DMG with completion information <br />following completion of the exploration program. <br />w~e:neuc.~ey~ <br />9.:,,,,~ <br />