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Water Contamination Investigation

Investigation finds Tolko followed forest rules, not proven to directly cause landslides

Jan 7, 2022 | 11:38 AM

An investigation stemming from a complaint of timber harvesting and landslides between Lumby and Cherryville found Tolko Forest Industries Ltd. met the requirements of Forest and Range Practices Act, but more could have been done to assess the potential impacts of its activities.

Silver Hills Watershed Watch complained that Tolko’s forest harvesting in the area over the past few years increased water flows, contributed to four landslides, and led to increased sediment in streams that supply drinking water.

“The investigation found that Tolko’s activities met all legal requirements,” said Kevin Kriese, chair of the Forest Practices Board. “Tolko completed terrain stability assessments for its harvest blocks. However, it did not complete a watershed assessment, which we believe would have provided a better picture of the risks created by harvesting and might have led to different practices.

“Watershed assessments are not legally required, but are a good practice where forestry activities pose a risk to resource values.”

One cut block was harvested by Tolko in 2015, then a second cut block was salvage-harvested following a 2018 wildfire. In May of 2020, four landslides occurred below those areas, affecting McPherson Creek, the main supply of residents’ drinking water.

The investigation identified a number of factors that contributed to the landslides, though it was not possible to determine the extend to which harvesting was a factor or whether the slides would have occurred anyway.

Other contributing factors identified include the natural geology of the area, which is prone to landslides, high precipitation and snowpack levels, and the impacts of wildfires to natural vegetation and soil.

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