Crux was contracted to complete geotechnical exploration drilling for new tower sites within the Angeles National Forest. The area has always been considered environmentally sensitive, but became even more so after a September 2009 fire consumed more than three quarters of the forest. Both segments 6 and 11 extend through parts of the burned area and required special attention to preserving wildlife, minimizing vegetation disturbance and mitigating future fire potential.
The project consisted of drilling 4800 feet at 81 geotechnical borings to obtain core samples along the proposed alignment. Helicopter-portable drills were used on a majority of the boring sites for logistical necessity, and as a means of reducing environment impact. Track-mounted, heavy drills were utilized in areas where the terrain was less rugged and environmental impact was less of a concern.
Once the alignments were permitted for construction, Crux was selected to provide specialty foundation design-build services in sensitive areas on both segments.