What do I need to do if the results of a Tier 1 hydrological risk assessment determine my site to be low, moderate or high risk?

For sites classified as ‘low risk’, no further site investigative work is required.  For sites classified as ‘moderate’ or ‘high’ risk, the Environment Agency will require Tier 2 or 3 risk assessment respectively:

Tier 2:  Preliminary quantitative risk assessment with detailed desk study and preliminary site investigation.

Tier 3:  Detailed quantitative risk assessment.