“In June 1973 the F.C.V. (Forests Commission       Victoria) carried out a larger study in 1 335 hectare section of a pine       plantation in a catchment of Clear Creek near Myrtleford. Four stream
      sample points were established at varying distances from the spray area       and a total of 1,000 samples were collected over a ten day period. Major       peaks in 2,4,5-T concentration occurred after rain, and lesser, relatively       insignificant, peaks also occurred during spraying (McKimm, 1974). McKimm       stated that 2,4,5-T concentrations were in excess of the upper limit
      of 20 ug/litre set by the N.H. & M.R.C. but he did not list values.

      In fact, at the sampling point immediately below the spray zone values       of 75 ug/l were obtained during spraying and peaks up to 690ug/l were       obtained after rain. Three kilometres downstream values of 135 ug/l       were obtained during spraying and peaks up to 500ug/l were obtained       after rain. Worse, for the sampling point immediately below the spray       zone, of 83 readings made during the seven days after spraying, 48%        (40) exceeded 20 ug/l.; 14% (12) exceeded 50 ug/l.; and 7% (6) exceeded       100 ug/l.

These measurements indicated that there was a significant       threat to streams in aerially sprayed areas, but nothing was done. Rather,        two new monitoring programs were organised, one at Carboor near Myrtleford       and another at Narbethong in the Central Highlands.” (Source:        The Herbicide 2,4,5-T and its use in Forestry. By Peter Rawlinson Zoology       Department, LaTrobe University, Bundoora, 3083. 1980?).

Brenda Rosser

1973 – June.  The Forests Commission in Victoria, Australia aerial spray 2,4,5-T in the catchment of Clear Creek near Myrtleford.  The study done at the time on levels of contamination in the water indicated that there was a significant threat to streams in aerially-sprayed areas, but nothing was done.