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Horizontal Directional Drilling (HDD) is defined as “A steerable system for the installation of pipes, conduits, and cables in a shallow arc using a surfaced launched drilling rig. Traditionally HDD is applied to large scale crossings such as rivers in which a fluid filled pilot hole is drilled without rotating the drill string, and this is then enlarged by a wash over pipe and back reamer to the size required by the product.” (Trenchless Data Service 2000). It is currently an efficient, safe, cost effective method for highway bores and is the current industry standard for trenchless technology.
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Consideration should be given to the overall safety, aesthetic quality, costs and difficulty of construction and maintenance of both the utility facility and the highway. Recommendations will be made on cost comparisons of directional drilling compared to Jack and Bore, horizontal and vertical location requirements and clearances, industry codes and other government regulations or provisions, preservation and restoration of highway facilities, appurtenances, natural features, vegetation and limitation on the utilities activities in right of way, protection of traffic during and after installation including Traffic control, Access control, open pits, material storage and vehicle parking, timing of projects, length of time to construct, direct and indirect environmental and economic effects including loss of productive agricultural land or impairment of that land, and liabilities associated with future relocations.
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