The intersect method is utilized when the length, the soil conditions, or a combination of the two do not allow the use of a single drilling rig to accomplish the bore. In an intersect HDD installation, two directional drilling rigs (a primary and secondary drilling rig) are placed at opposite ends of a project site and start drilling toward each other guided by a precision underground magnetic tracking device. Once the bores are within a pre-determined distance from each other, the primary rig advances its drill string, following behind the secondary rig’s retreating downhole assembly. The advancing drill string is then steered toward and ultimately “falls” into the vacated borehole produced by the retreating drill string, creating a continuous single borehole. The borehole is then reamed to the appropriate size and product pipe is pulled.