The proposal aims to undertake clearing and earthworks of an additional 32 hectares on Barrow Island for extra construction laydown and operations support to the existing Gorgon project.

EPA chairman Paul Vogel said the proposal was assessed to determine if the existing conditions on the development could be applied to the revised footprint.

"The EPA's assessment was an opportunity to re-examine the established management plans and the measures the proponent has taken to avoid, minimise and rectify impacts to flora, vegetation and fauna including selecting a site that avoided Boodie warrens and raptor nests," Vogel said.

"The EPA concluded that the conditions set out in the original approval are effective in managing impacts and should be implemented for the additional development."

However, the EPA also recommended an additional condition to offset the significant residual impacts of clearing 32 hectares of a Class-A Nature Reserve, including habitat for specially protected fauna.

The EPA has recommended the proponent offset the impact to the area by extending the established threatened species translocation and reintroduction program for a further two years.

"The threatened species translocation and reintroduction program will be extended from 12 years to 14 years.

"This offset represents a 10 per cent increase in the contribution, which is equal to the approximately 10 per cent increase in the project footprint from 300 hectares to 332 hectares."

Vogel said the proponent had also committed to rehabilitate land within the development envelope when no longer required to support construction and operation of the Gorgon development.

The EPA's report to the Minister for Environment is now open for a two-week public appeal period, closing January 20.