https://baddevelopers.nfshost.com/Docs/gmw.htm
18 April 1985
Contamination of Purchased Herbicides
The Minister was advised that the herbicide Xylaquat supplied by Shell Australia, and used by the (Rural Water) Commission in its channels for weed control purposes, has been found to be contaminated by Dieldrin and other pesticides. Remedial action is being taken to protect consumers by warnings and by disposal of contaminated sediment from a Rural Water Commission channel at Harcourt. Investigations are continuing on other possible sites and negotiations are proposed with the supplier with a view to recovering associated costs and any subsequent claims faced by the Commission.