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about 500 feet west of the Dolores Canyon rim. Access to the site requires substantial <br />improvement of about 3,500 feet of existing 4WD road. <br />Drill Site 5 is located along existing roads (County Roads F4 and F11) on prospecting <br />permit application COC- 73576. The proposed drill site was positioned to intersect a <br />region of flat dipping stratigraphy and is located about 500 feet west of the Dolores <br />Canyon rim. Access to the site would not require substantial road improvement. <br />Drill Site 6 is located on prospecting permit application COC -74370 and was positioned <br />to intersect a region of flat dipping stratigraphy. It is accessible by about 1 mile of <br />existing 4WD road extending from Sand Rock Road (also known as B Road). However, <br />substantial improvements to the existing 4WD road will be necessary to facilitate drilling <br />operations. <br />2.2.3 Drill Pad Layout and Equipment <br />The anticipated cores and tests would require moderate size drilling equipment capable of <br />reaching depths of 6,500 feet and would employ a pitless closed loop drilling system. <br />Each drill pad would measure 250 by 250 feet (1.43 acres) and include: four 400 barrel <br />(16,800 gallon) tanks to hold mud and four rectangular tanks holding roughly 700 barrels <br />(29,400 gallons) each to do premixing of chemicals for fresh water- and oil -based muds, <br />a drill rig with blowout preventer, shale shaker, centrifuge, mud pumps, two personnel <br />trailers, a topsoil storage stockpile from initial grading of the drill pad area, a bermed and <br />lined pad for drying and temporary storage of fresh water -based drill cuttings (40 feet by <br />35 feet), a temporary storage area for the steel drums that would contain the oil -based <br />cuttings (30 by 30 feet), a flare pad (15 by 35 feet), and a portable toilet (Figure 3). A 10 <br />barrel (420 gallon) tank with secondary containment of 150 percent of the tank volume <br />would be used to store diesel fuel to run the drilling rig engines. <br />The drill rig would be a large truck - mounted drilling rig such as a Schramm T130XD <br />type (Photo 1), or similar, depending on availability. This rig is capable of mud drilling <br />to at least 5,500 feet and coring up to 7,000 feet. A shale shaker is set up behind the drill <br />rig to remove cuttings for minimum water and mud consumption, and effective mud re- <br />circulation. The drill rig is 9 feet by 43 feet by about 14 feet high at transport; when <br />extended, the drill rig with the extended derrick is about 70 feet high. The wellhead <br />would be equipped with a blowout preventer (BOP) stack, rated to handle any expected <br />high pressure zones (at least 3,000 psi), and related equipment. <br />RM Potash Exploration Project 18 <br />Environmental Assessment <br />