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Methods and Equipment for Drilling Rotary drilling and coring on each site will be completed using arubber-tired truck- mounted drilling rig. To aid in the protection of the hydrologic balance and protect other resources the company will utilize as small a drill rig as can safely and successfully complete the job. In doing so, the requirements for access road and drill site disturbances aze lessened. Support equipment may consist of one or two water trucks, one rig-up truck, a pipe truck, flatbed trailer, one or more air compressors, and/or boosters, a supply trailer and three 4 x 4 pickups for the drill crews and company representatives. This assembly is generally referred to as a "drilling unit". Two drilling units are anticipated during the drilling project. Water for drilling operations will either be purchased and trucked to the sites from outside the project area or leased and obtained from the Big Salt Wash drainage. Pumping the water used in the drilling process, if possible, wilt minimize water truck traffic on the temporary access roads thereby minimizing surface disturbance. The use of these other potential water sources will be approved by the agency or parry owning the water rights prior to their use. hi the event stock ponds are utilized, minimum water levels will be established to ensure sufficient water is left for stock and wildlife. Upon hole completion, one truck mounted geophysical logging unit will be used at each hole location. If requested, Ark Land Company will retain in its files all drill and geophysical logs and all un-analyzed drill cores for at least 1 yeaz, and will make them available for inspection by an authorized officer. Estimated Size and Denth of Holes Drilling conditions aze variable in the exploration area. The initial diazneter of each drill ' hole will be 9 7/8 inches to allow for the placement of up to 100 feet of surface casing. This casing is centered and cemented in-place from the top of the hole. Unless continuously cored from the surface, a smaller (6 1 /8") diameter rotary hole will be drilled to core point (50 ft. above ' the uppermost mineable seam). This 6 1/8" rotary hole will be cased if necessary to maintain hole integrity. The primary drilling medium will be compressed air with mist/foam injection to ' aid in the circulation of cuttings to the surface. If air and foam prove to be an insufficient medium, or if lost circulation becomes a problem, drilling mud and lost circulation materials will be used. ' The core retrieved from the hole will be approximately 3 inches in diameter although smaller diameter core (1 7/8") may be used in some instances. The outer diameter of the cored ~ portion of the hole will be 5 inches or less. Table III depicts the estimated depths for each of the six proposed holes in the exploration area. 11