Clean Harbors has begun construction of a vertical expansion of its Telfer Rd. landfill near Brigden.
Company spokesman Michael Parker says they're digging a pond and preparing the site after receiving final provincial approval on Monday.
The $12-million to $15-million project will add up to five-million cubic metres (m) of new capacity.
Parker says they're taking steps to prevent off-site impact.
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Up to 50 contractors will be on site during construction which is expected to wrap up in late February.