"I would be responsible for the storage of the chemical and I need to revise that obviously."
Dr Maud was not at work when the spill occurred but went in after the news broke.
"It was quite alarming at the time."
Dr Maud said all four people had now been discharged from hospital, including the pregnant woman.
"She said they were quite thorough at the hospital and she was free to go, she said she was cleared and that she was okay."
He saw three of the victims at the emergency department at North Shore Hospital, and spoke to them when they returned to the medical centre to collect their belongings.
"No one was saying they had any breathing issues, they said they were comfortable."
Dr Maud said one person required further treatment, but he confirmed it was not the pregnant woman.