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<br />15080 - 4/10 <br />system to detect electrical current from the drill string and an audible alarm which <br />automatically sounds when an electrical current is detected. <br />B. Drill Head: The drill head shall be steerable by changing its rotation and shall <br />provide the necessary cuffing surfaces and drilling fluid jets. <br />C. Mud Motors (if required): Mud motors shall be of adequate power to turn the <br />required drilling tools. <br />D. Drill Pipe: Shall be constructed of high quality 4130 seamless tubing, grade D or <br />better, with threaded box and pins. Tool joints should be hardened to 32-36 RC. <br />2.04 GUIDANCE SYSTEM <br />A. A Magnetic Guidance System (MGS) or proven gyroscopic system shall be used to <br />provide a continuous and accurate determination of the location of the drill head <br />during the drilling operation. The guidance shall be capable of tracking at all depths <br />up to one hundred feet and in any soil condition, including hard rock. It shall enable <br />the driller to guide the drill head by providing immediate information on the tool face, <br />azimuth (horizontal direction), and inclination (vertical direction). The guidance <br />system shall be accurate to +2 percent of the vertical depth of the borehole at <br />sensing position at depths up to one hundred feet and accurate within 1.5 meters <br />horizontally. <br />B. The Guidance System shall be of a proven type and shall be operated by personnel <br />trained and experienced with this system. The Operator shall be aware of any <br />magnetic anomalies on the surface of the drill path and shall consider such <br />influences in the operation of the guidance system if using a magnetic system. <br />2.05 DRILLING FLUID (MUD) SYSTEM <br />A. Mixing System: A self-contained, closed, drilling fluid mixing system shall be of <br />sufficient size to mix and deliver drilling fluid. Mixing system shall continually agitate <br />the drilling fluid during drilling operations. <br />B. Drilling Fluids: Drilling fluid shall be composed of clean water and appropriate clay <br />additives. Water shall be from an authorized source with a pH of 8.5 - 10. Water of a <br />lower pH or with excessive calcium shall be treated with the appropriate amount of <br />sodium carbonate or equal. The water and additives shall be mixed thoroughly and <br />be absent of any clumps or clods. No potentially hazardous material may be used in <br />drilling fluid. <br />C. Delivery System: The mud pumping system shall have adequate capacity of <br />required throughout the project and be capable of delivering the drilling fluid at a <br />constant pressure. The delivery system shall have filters in-line to prevent solids <br />from being pumped into the drill pipe. Connections between the pump and drill pipe <br />shall be relatively leak-free. Used drilling fluid and drilling fluid spilled during drilling <br />operations shall be contained and conveyed to the drilling fluid recycling system. A <br />berm, minimum of 12 inches high, shall be maintained around drill rigs, drilling fluid <br />mixing system, entry and exit pits and drilling fluid recycling system to prevent spills <br />into the surrounding environment. Pumps and or vacuum truck(s) of sufficient size <br />shall be in place to convey excess drilling fluid from containment areas to storage <br />and recycling facilities.