Testing of water samples taken after the September 28 aerial application of 1080 at Russell Forest failed to find any trace of the toxin, according to the Department of Conservation.
Samples were taken 15 and 39 hours after the operation, and on October 25, following 10mm of rain over 24 hours, at two sites within the treatment area and eight outside it. One of the 30 samples at 15 hours produced detectable 1080, at 0.1 part per billion (ppb), well below the Ministry of Health's precautionary drinking water standard of 2ppb.
When that water was re-tested at 39 hours, no detectable 1080 was found, nor was the toxin detected in drinking water supplies.
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DOC's Northern North Island operations director Sue Reed Thomas said the results supported the department's contention that 1080 broke down very quickly in water.