The documents were published on the Department of Primary Industries, Water and Environments routine disclosure logs on Wednesday.

They include emails from the Forest Practices Authority chief forest practices officer Peter Volker, sent in August, in which he raised concerns about the progress of restoring former logging coupes in south-west Tasmania.

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In 2013, some logging coupes became apart of the World Heritage Area when the area was expanded. Environment Tasmania was put in charge of restoring those coupes.

Speaking about the released documents, Mr Volker said he was concerned that one particular coupe, Picton 43E, did not have trees after six years. He also raised concerns about the use of experimental techniques to restore the land, which he said had failed.

Environment Tasmania strategy director Laura Kelly said the organisation was granted $1.2 million from the Biodiversity Fund to restore a number of coupes in the World Heritage Area and Skyline Tier Plantation. She said they finished in 2017 and passed a federal government audit.

"[Picton 43E] as clear-felled in 2010 but no ecological restoration burn was done - which ruled out an ecological burn to assist regeneration," Ms Kelly said.

"To encourage restoration as quickly as possible Environment Tasmania worked closely with its partners in DPIPWE, TPWS and Forestry Tasmania to move large piles of logs with machinery and sow twice the standard volume of local eucalypt seed. All regeneration work followed the Forest Practices Code.

"The coup is regenerating well for its altitude but should be monitored annually for the next five years to track growth."

Ms Kelly said the organisation had answered every question put to them about the restoration processes over the past two years.

"Given the project has already passed a federal government audit, the ongoing interest from Mr Volker and conservative politicians has been unusual," she said.

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