The Environment Plan covers Seabed intervention and Trunkline installation activities in Commonwealth waters for the Scarborough development. Activities run from the Commonwealth – State waters boundary approximately 32 km north of Dampier to the Scarborough gas field located at Woodside-operated title block WA-61-L, approximately 375 km west-northwest of the Burrup Peninsula.

The approx. water depth for the activities is 32 m – 1400 m

The earliest activity commencement date is Q4 2023 pending approvals, vessel availability and weather constraints. The estimated activity duration is 24 months across multiple campaigns.

The Eastern end of the Trunkline route overlaps with the Pilbara Port Authority Dampier Port Limits. The trunkline corridor runs through the Montebello Marine Park – Multiple Use Zone (Cth), close to the northern boundary.

The Operational Area includes the proposed Trunkline from the Scarborough FPU (approximately 430 km north-west of the Burrup) to the State waters boundary and 1.5 km either side of the proposed Trunkline centreline to allow for the movement and positioning of vessels. This also includes Spoil Ground 5A, which is approximately 300 m wide and runs ~17 km from the State waters boundary. It also includes the Offshore Borrow Ground (location where sand will be sourced) which is located to the north of the Dampier Marine Park Habitat Protection Zone and 20 km to the east of the proposed Trunkline route. A minimum 250 m buffer will be in place from the Dampier Marine Park boundary.

Vessels included in the activity:
• Trailing suction hopper dredge (TSHD)
• Offshore construction vessel (OCV)
• Rock Installation Vessel (RIV)
• Pipelay Vessel (PV) multi-joint operation
• Shallow Water Lay Barge (SWLB)
• Anchor handling vessel/tug
• Pipe supply vessels
• Survey vessels
• Support vessels
• Fuel bunkering vessels