Impact moling is frequently used to install service pipes e.g.  gas and water pipes to proprieties.  This can be from an access chamber (see method below) or and excavation adjacent to a highway thus going under the road without the necessity for excavating a trench.  Cables can also be installed using this method with or without ducting, although the provision of a duct is generally regarded as a safer method of cable installation and protection.

IMPACT MOLING METHOD
The standard approach to moling is to dig a hole about 1 m square and 2 m deep. Such a hole is small enough that it can be dug by hand instead of by machine in inaccessible locations. The mole is then entered into the earth on the horizontal face at the bottom of this hole. A destination hole of similar proportions is also dug, and this is where the mole emerges. The mole itself is a steel cylinder approximately 600 mm in length and can vary in diameter from 50mm to 150mm.  It works as a pneumatic cylinder with pulsed compressed air causing the head of the mole to repeatedly hammer against the soil in front of the mole. Once the mole has passed through the earth the pipe can be pulled through the long horizontal hole.

Impact  moles  consist  of  an  enclosed  steel  tube  containing  an  air powered  piston  that strikes the nose of the tool driving it forward. A bore is formed by displacing and compacting the  soil  laterally.  The  friction  between  the  ground  and  the  mole  body  prevents  the  mole  from  rebounding backwards. Repeated impacts of the piston advance the whole unit through the ground. It is an untethered boring  device.  There  is  no  rigid  connection between the mole and the insertion pit, and the progress of the mole relies upon the frictional resistance of the ground for its overall forward movement.