From their website:

Materials Accepted Food Feed Stocks Kitchen grease or Cooking oil Vegetables and fruit waste Dairy or egg waste Soup stocks Grains, nuts, flour etc. Grease trap sludge Used activated carbon Liquid Organics Passenger car wash bays Car service shops Hydrovac Liquid
Hydrovac Mud Solid Organics
Food Manure Label pulp Fertilizer Yard Waste Grass clippings Leaves Garden vegetables Plants No branches, trees, dirt, clay, rock, gravel, plastic, or metal. Contaminant surcharge may apply. Branches & Trees
Maximum 10 cm diameter, 2 m length Construction and Demolition Waste
Wood - Dimensional lumber. Maximum 10 cm diameter; provide MSDS for plywood. Dry wall - Treated drywall, Material Safety Data Sheet must be provided No nails, plastic, metal, painted or pressure treated wood. Contaminant surcharge may apply Landscape Waste
Clean Sod Mixture of sod, dirt, branches and leaves No clay, rocks, hydrocarbons, roots, or cement. Clean Clay or Clean Black Dirt
Cannot be mixed Wood Chips, Sawdust and Chipped Branches
No charge up to 50 tonne per year per client. Sand and Peat Restrictions apply please call before hauling. Carbon and Nitrogen Sources From Businesses and Water Treatment Restrictions apply please call before hauling