1. Defining the definition of a building to be incorporated into NGN’s build over policy.
2. Develop a formal risk assessment approach/decision tree for built over mains that would stand the test of an HSE challenge

A report detailing the analysis carried out and the final risk assessment/decision tree for overbuilds in various locations/situations.

The project will be deemed successful, if a risk based decision tree has been developed that results in

• Safety improvements

• Facilitates the development of innovative remediation techniques to mitigate the risk from close proximity to property like annulus sealing for example