4. The disposal of soils containing contaminants in a concentration lower than the limit values in Schedule I is prohibited on or in soils having a contaminant concentration lower than the contaminant concentration in the soils disposed of.
In addition, the soils may not be disposed of on or in land to be used for housing unless the soils are used as backfill in connection with land rehabilitation work in accordance with the Environment Quality Act (chapter Q-2) and the contaminant concentration in the soils is equal to or lower than the contaminant concentration in the host soils.
This section does not, however, apply to soils disposed of on the site of origin or soils disposed of on the site of the source contamination activity.