Victoria's Environmental Protection Authority hopes to have a clearer picture of the type and amount of waste buried at a property near Kaniva soon.
In a statement on Monday, the EPA said it would "undertake preliminary excavation works at some of the suspected sites of illegally dumped waste" in coming weeks.
"This will help begin to identify the type and extent of waste buried," it said.
The EPA has previously said the Lemon Springs property, 15 kilometres south of Kaniva, contains 20 underground dump sites of suspected industrial waste. It was first alerted to the problem in July 2018. The EPA said it would also engage a specialist to undertake an independent risk assessment.
"This will identify any further measures required, as well as provide remediation options for consideration," the statement said.
"Emergency management planning is also well underway for the coming fire season and the EPA has issued the owner of the property, Graham White, a notice requiring the site be secured and signage installed as well as an environmental site assessment conducted."
The EPA issued Mr White with a clean-up notice in early September. Mr White was released from prison for serious firearm offences during the same month.
In parliament on Wednesday, Member for Lowan Emma Kealy asked Climate Change, Energy and Environment Minister Lily D'Ambrosio when the waste would be cleaned up.
Her comments came as parliament debated the government's draft Dangerous Goods Amendment (Penalty Reform) Bill. This seeks to increase the financial and jail penalties for individuals and body corporates who stockpile dangerous chemicals.