TasNetworks will start one-on-one meetings between former Hydro-Electric Commission employees exposed to toxic chemicals and a toxicologist on Tuesday.
The organisation briefed employees on its investigation into the Hydro-Electric Commission's use of herbicide for vegetation spraying between the 1960s and the 1980s at a 'Toolbox' meeting on Monday morning.
TasNetworks had been speaking with 12 employees and seven former Hydro-Electric Commission employees about the chemical exposure, but a further eight employees who think they were affected came forward late last week, chief executive Lance Balcombe said.
"TasNetworks continues to work closely with WorkSafe Tasmania on potential use of herbicides by current and former employees," Mr Balcombe said.
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The Communications, Electrical and Plumbing Union of Australia puts the number of former employees impacted at more than 40.