EESA06H3 Study Guide - Final Guide: Keele Valley Landfill, Information Geometry, Leachate
Document Summary
Landfill: the artificial landscape waste water and maybe surface rivers into underlying aquifers waste dumps. Torontonians quickly learned to modify landscape using waste materials as fill". Initially this was limited to disposal of night soil" and ash from houses. The natural gradient of river was destroyed and required constant dredging. Volume of sediment removed reflects various phases of urban construction in watershed. Downtown area underline by iroquois sands and gravels. Abandoned pits and quarries prime sites for reclamation" are infilled with industrial and residential. 1970-1990 was out of sight, out of mind". Liquid and solid waste simply dumped in the ground. Percolation of rainwater down waste creates leachate" which contaminates surrounding ground. Landfills now have liners" at their base which collects and treats leachate. Vertical joints and gravel beds act as hydraulic windows" which allow leachate to pass through till. Northern till is a 50 m layer across southern ontario which is thought to be suitable foundation for.