St. Marys Cement Inc. (Canada) - Environmental Compliance Approval (sewage)

This proposal is for a new Environmental Compliance Approval (Industrial Sewage) for St. Marys Cement Inc. (Canada), located at the CBM McNally Pit at 4350 Concession 7 (Part of Lots 25, 26, and 27, Concession 2), in the Township of Puslinch, Ontario.

The proposed works are for the collection, transmission, treatment and disposal of wash water from an existing aggregate washing plant that has been in operation since 2011. The aggregate wash water is drawn from the McNally Pit below water table extraction area (source pond) and is pumped through the wash plant where it is used to remove native fine grain soils from the coarse aggregate. After washing, the slurry (water and soil) is returned to the McNally Pit Source Pond to settle the native fine grain soils (fine sand, silt and clay). The clarified water re-enters the Source Pond and is reused within the washing operations or re-enters the local groundwater flows system.

The Ministry may require monitoring of the industrial wastewater effluent discharge leaving the site.