If a path is constructed over a poor sub-grade, excavation to remove wet, organic or otherwise unsuitable material, treatment with soil-cement or application of a geotextile fabric may be required.

Pangolin also develop and produce a complete range of soil non-excavation drill, including Bit-oriented, sub-actuators, Drum-type Reamer, Flow-type Reamer, Plate-type Reamer, Adjustable joints.