Equipment: Vermeer® 24x40a and a StraightLine® 5″ Air Hammer System. This combination allowed excellent penetration rates in the granite while also providing the flexibility needed to accomplish the vast grade changes. Ground conditions: Bore length was just over 300′, the first 200′ was solid granite and the last 150′ was 60% granite and the balance … Continued
Equipment: Astec® DD3238 and a StraightLine® 4″ Air Hammer System. Ground conditions: First 90 feet consisted of dirt and rocks smaller than 3-feet, the last 100-feet was solid granite. Project: Water service requiring a minimum 3-foot of cover that totaled 190′ in length. Over the course of the bore the elevation rose 40-feet. Entered the … Continued
Equipment: Astec® DD3238 and a StraightLine® 4″ Air Hammer System. Ground conditions:Clay soil with 3 x 10+ foot diameter granite boulders in the bore path. Project: water service requiring a minimum 3-feet of cover that totaled 90-feet in length. Entered the ground at a minus 18%, drilled conventionally until a boulder was encountered, engaged the … Continued
