Introduction: When tower line circuits have been identified for refurbishment or replacement it is necessary to make an assessment of the foundation condition. Traditional methods involve invasive excavation to expose the foundation blocks for visual inspection. This project will trial underground structure survey technologies already utilised in the civil and geotechnical engineering industries to assess the condition of tower foundations and compare with the findings of traditional techniques.

Objectives: Due to the intensive labour and time effort involved it is normal practice when excavating foundations to perform an assessment on a 10% sample of towers. The objective with this non invasive technology is to enable all tower foundations to be examined.