2016-05-19_PERMIT FILE - C1982056 (3)

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containment of both drilling fluids and materials, and any surface runoff from the pad areas. Drainage from drill- sites will be controlled by the containment pits, in combination with Alternative Sediment Controls (ASC's), including earthen berms, straw wattles, silt fencing, or other appropriate materials. Nominal 5.625 -inch drillholes will be completed using conventional rotary drilling methods and drilling mud as the circulation medium to depths ranging from 1,500 to 1,800 feet. Contract terms limit drilling compounds and additive to materials that are non- toxic and bio -degradable. Corehole samples will be recovered from some or all drillholes, and all drillholes would be geophysically logged. On completion of drilling and logging, all drillholes will be plugged and sealed in accordance with State Engineer requirements, and drill sites will be reclaimed by allowing any mud pits to dry -out, backfilling the pits and grading any disturbance to blend with the surrounding terrain and reestablish natural drainage patterns, replacing stockpiled soil materials, and seeding with either the rangeland or dryland pasture seed mixtures (dependent on the pre -disturbance vegetation community). 2012 WMD Exploration Program (MR12-261) TC proposes to construct drill -pads, and drill and log up to 5 exploration drillholes in the active WMD, in order to more accurately define structural conditions, including faulting. The proposed drillhole locations as shown on Figure EX52-F 1, 2012 WMD Exploration Program, and Map 24, are on lands where TC is the surface owner, and controls the coal through a valid existing lease. The proposed drill -sites have been evaluated for both potential cultural resource and wildlife impacts, as documented by the cultural resource survey report included in Exhibit 6L and the wildlife consultation letter provided in Exhibit 23C. Drill -site selection, access, construction, drilling and reclamation practices will be essentially the same as previously described for the 2011-2012 exploration program. Nominal 5.625 -inch drillholes will be completed using conventional rotary drilling methods and drilling mud as the circulation medium to depths ranging from 1,300 to 1,600 feet. 2012 WMD Seismic Survey (MR12-265) TC proposes to complete a seismic survey to better define the geology of the coal seams and structural features in an area to the south of our present WMD. The proposed seismic survey will involve completion of five seismic lines, ranging from 5.500 to 8.800 feet in length (total length approximately 37,600 feet) utilizing the "DiQipulse" method. This method involves the use of an all -terrain vehicle -mounted impact hammer, and geophones connected to a mobile truck -mounted receiver./recorder (s( -.e attached description). The proposed seismic program is anticipated to be completed during January 2013, therefore, a snow -cat may be utilized to remove snow to facilitate access. The proposed activities will, however, involve no direct ground disturbance, therefore there will be no bond associated with this project. TC has completed a wildlife consultation for the project, as documented by the wildlife consultation letter provided in Exhibit 23C, and will comply with the applicable conditions identified. All seismic survey lines will be accessed from Routt County Roads 37 and 27, and the survey lines have been laid - out to generally follow existing two -track ranch roads. It is anticipated that the project will take 3-4 weeks to complete and will be completed in late January or early February 2013. The following outlines typical field operations for the planned seismic survey: 1. The site is first permitted and arrangements are made for survey crew access 2. The site is scouted and assessed, and survey parameters determined 3. A snov.-cat is used tc clear snow, as needed for access +.11surye`or• lays -out the geoplhone locations using,, ire stake flays appro,c,Imately eery 92 feet 6. Equipment to be used: a. One source truck b. Two line pick-up trucks c. Utility pick-up truck for trouble shooting d. Mobile and truck -mounted communication equipment PR15-11 2.05-17.2 07/06/15