The Gas Export Pipeline (GEP) is approximately 889 km long, with approximately 793 km located within Commonwealth waters, between the Ichthys Field and the Northern Territory 3 nautical mile (n mile) limit. Activities covered by this Environment Plan are wholly located in Commonwealth waters and the operational area is defined as a 2 km wide corridor, 1 km either side of the GEP centre line, up to and including the gas export riser base. 
Inspections provide assurance that infrastructure is performing according to design. They also proactively identify maintenance and/or repair activities that may be required to protect the GEP's integrity.
Inspection activities within the EP include:
ROV inspections
marine acoustic surveys
Repair activities described in the EP are not intended to occur, but if required may include: 
seabed intervention (e.g. jetting, mass flow excavation, installing grout bags, rock placement or concrete mattress installation)
marine growth removal
clamp repair
pigging to recover the integrity of the GEP
Typically a single vessel can be used to conduct IMR activities. Depending on the nature and location of a repair activity a second vessel may be required. Vessels will use Group II hydrocarbons such as Marine Gas Oil (diesel).
Expected Activity commencement date is Q2, 2016. Inspection, maintenance and repair activities could occur in the order of 5 – 60 days per year, depending on the nature of the work required. Additional time may be required for any IMR program depending on the specific circumstances of the inspection, maintenance or repair and weather conditions.
Note: This information has been extracted from the EP.