He didn't keep holiday or leave records for any of his employees.
The detection of Bonamia ostreae last month sparked concerns for the Bluff oyster fishery.
"Former staff of the smelter report burying of spent cell linings or contaminated material in various parts of the Tiwai site."
It will be in place for an "indefinite period".
Routine testing had found three infected wild oysters near Stewart Island.
Patients are being asked to avoid the emergency department.
The company says no jobs will be lost as a result.
"If she seizes for over five minutes she needs urgent medical care and volunteers and a first response unit can't give that."
Much of the centre of Orepuki is up for sale - for just $469,000.