The borehole size is larger but not outside what the rig is capable of. Geothermal drills 4.25- to 6.5–inch diameter holes to a depth of 400 to 500 feet. Cathodic drills an 8- to 10-inch hole to 500 feet. Once the borehole is drilled, both geothermal and cathodic require special equipment for product installation and pumping grout material down the hole.
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