Walker Environmental Group Inc. - Environmental Compliance Approval (waste)

This amended Environmental Compliance Approval No. A121001,dated March 26, 2025, is for the use and operation of a 15-hectares waste disposal site consisting of a closed west quarry landfill and a transfer/processing (composting) site sited on top of the Landfill serving the Province of Ontario and the following waste management activities:

• construction, operation and monitoring of a 5.3-hectares composting site to receive and process a maximum of 90,000 tonnes per year of biodegradable organic waste originating in the province of Ontario
• receipt, temporary storage, processing and transfer of wood
• post-closure care and monitoring of the closed west quarry landfill

The composting site encompasses the following processes, structures, equipment and areas:

• 5.3 hectares of the closed landfill, covered with approximately 1,000 millimetres of pulverized shale, 150 millimetres of granular A, and overlaid with approximately 120 millimetres of asphalt, used to construct the composting site and comprising the following:
  • one 2,069 square metres (approximate) receiving building including the following areas
  • one -1,095 square metres (approximate) fully enclosed receiving area, for receiving source separated organics and operated under negative pressure and exhausting into two -124 square metres biofilters or as approved in the Air/ Noise Approval
  • one -726 square metres (approximate) partially enclosed structure to be used as a processing area
  • one -7.8 hectare GORE^TM Cover Composting System on an asphalt pad to be used for 20 in-vessel composting channels with in-floor trenches to deliver air to the windrows and to collect leachate from the windrows, to compost source separated organics, leaf and yard waste and the other approved compostable organic waste
  • one -2.8 hectare pad to be used for open windrow composting and/or for a modified GORE^TM Cover Composting System consisting of four windrows, each with an aeration blower and the GORE^TM cover but without the concrete channels and underdrains, to compost waste as follows:
    • continued composting of the processed organic waste that has completed phases I and II of the GORE^{TM ​​​​​​​}Cover Composting
    • open Windrow Composting of leaf and yard waste mixed with the processed organic waste that has completed Phase II of the GORE^TM Cover Composting; and curing of immature compost
    • one -9,359 cubic metres stormwater pond to collect leachate and stormwater run-off from the hard surfaces of the GORE^TM Cover Composting System pads and from the Open Windrow Composting area
    • a stormwater pond aeration system consisting of a series of surface water aerators and/or one windmill system
    • ancillary structures such as roads, weigh scales, office building and other equipment and infrastructure as required for the operation of the site

The closed west quarry landfill encompasses the covered waste footprint area and its leachate management system, including the leachate monitoring wells.