The Fraser Valley Regional District wants to be "in the chair" with the Environment Minister in the investigation into toxic ash.
FVRD chair Sharon Gaetz says they have written Terry Lake to request intervener status in the investigation.
"We formally requested to the terms of reference for his investigation into fly ash testing irregularities found at Metro's Burnaby incinerator. We did that because we have now learned that toxic ash has been dumped in the Cache Creek landfill going back as far as November 2010."
With test results on ash in the Cache Creek landfill failing hazardous waste regulations, Gaetz says Metro Vancouver can't be trusted on the issue anymore.
She also downplays any claims the weather in Cache Creek may be a factor in levels detected, saying instead evidence is building waste to energy incinerators are not green.