Potentially toxic substance released after leak at Nova Gas Transmission Ltd. site.
U of Regina researcher says current government-set levels were set using data from the last 50 or so years.
Alberta Energy Regulator cites dry weather and low flow conditions.
Government offers a 20-point conservation action plan, but most measures won’t kick in until 2016.
2012 spill caused by contractor’s attempts to restart compressors at two wells.
Water demand to increase 500% by 2020; officials say they used the best available science.
Undiluted samples from the spill killed rainbow trout exposed to it.
Metals including selenium, boron and arsenic found at twice the recommended levels.