This document specifies the performance requirements for the installation of Lagooning processes. This document applies to wastewater Lagooning processes treating municipal wastewater from combined or separate sewage systems and when used as a tertiary treatment. NOTE Lagooning processes are especially suitable for treatment of wastewater where large variations in flow are experienced (e.g. resulting from stormwater). Lagoon Systems are also especially suitable when there are large variation in load from seasonal industrial or tourism for example.