OnGrade Manual - Ditch Witch

Conduct OnGrade Bore - 28OnGrade Operator’s ManualOnGrade Process Overview10. Use tracker to locate drill head and take initial reading. See “Initial” on page 34. This reading from laserplane to center of beacon is the target value for the bore.11. Add pipe, drill in and take readings as directed below until drill head enters end pit.IMPORTANT: Take pitch and depth readings at the same roll position.• pitch: every 12-18” (30-45 cm) with drill head stopped• depth: every 5-10’ (1.5-3 m) with drill head stopped12. Take measurement from the laser plane to the top of the beacon housing at the end pit using surveyingrod and laser receiver.Turning shaft will kill you or crush arm or leg. Stay away.NOTICE:• Tracker operator and drill operator should maintain two-way communication.• Keep everyone clear of the exposed drill string.• No one should enter pit until clear communication is given by the drill operator that the drill unitis shut down. If using tracker control (see drilling unit), do not enter pit until tracker control isturned off and green light on drill unit is lit.• Drill operator should be instructed to discontinue drill string rotation as soon as drill bit exits thebore. Use thrust only to extend drill string beyond exit hole.Incorrect procedures could result in death, injury, or propertydamage. Learn to use equipment correctly.NOTICE: Follow U.S. Department of Labor regulations on excavating and trenching(Part 1926, Subpart P) and other similar regulationsCompare the measurement taken at the end pit with the measurement taken at the start pit. If themeasurements match, the drill head is precisely at the desired elevation. If offsets were used, add orsubtract the offsets out and then compare readings.13. Remove drilling downhole tools and attach backreaming downhole tools.14. Backream the bore and pull back product pipe using proper techniques for soil conditions and slope ofthe bore. See “Process” on page 44.CMW