Markham Web Content Viewer (JSR 286)


German Mills Meadow & Natural Habitat

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Located in the German Mills community – south of John Street and west of Leslie Street – within the City of Markham, the German Mills Meadow and Natural Habitat is located on the former Sabiston Landfill Site. This Landfill Site (A - 10 hectares) which includes the East Fill Area (B - 16 hectares), covers a total of 26 hectares.

After the Site was capped, Markham purchased the land in October 1983, and is responsible for its ongoing maintenance and monitoring.

german mills area map


The City installed a gas collection system in 1985, a methane gas monitoring program in 1999 and an environmental monitoring program in 2003. This program currently includes:

  • Gas monitoring at the north, west, and south boundaries of the site
  • Seven surface water monitoring stations in German Mills Creek
  • Groundwater monitoring
    • 10 locations with 10 wells
    • 2 piezometers next to the creek

The Groundwater monitoring process compares samples taken from various locations on the site:

  • Background / up-gradient of the landfill
  • Within the landfill and east-fill areas
  • Next to German Mills Creek
  • Down-gradient of the landfill area

Current Situation

Results of the City’s ongoing monitoring program have indicated:

  • Landfill is still producing leachate
  • Groundwater quality down-gradient of the Site has higher concentrations of leachate contaminants compared to background/up-gradient  levels
  • The following contaminants are present at levels that exceed the Ministry of the Environment (MOE) Regulatory Requirements:
    • arsenic, chloride
    • total dissolved solids (TDS)
    • iron
    • sodium
    • dissolved organic compounds (DOC)
    • vinyl chloride
    • tri-chloroethene (TCE)
    • di-chloroethene (DCE)

It is unknown how far the groundwater impacts have travelled down-gradient of the Site or deeper into the aquifer. As a result, the City’s consultant has recommended the installation of 11 new groundwater monitoring wells in eight locations on the Site to assess groundwater conditions down-gradient and in the deeper aquifer. This installation work will begin in late February or early March 2014 and will take about three weeks to complete.

Frequently Asked Questions

Visit our Frequently Asked Questions page for more information. 

Related Documents

  • January 29, 2014 – German Mills Meadow and Natural Habitat Liaison Committee: Presentation [PDF]
  • October 9, 2013 - German Mills Meadow and Natural Habitat Liaison Committee #2: AMEC Presentation [PDF]
  • September 30, 2013 - German Mills Meadow and Natural Habitat Liaison Committee #1: Presentation [PDF]
  • Winter 2014 Update Brochure [PDF]

Council Documents