Monitoring Groundwater & Soil

Monitoring Groundwater

PHAI_EA_Groundwater_Large

What is the project monitoring?

  • Groundwater quality, levels and flow direction at the long-term waste management facility and at other major clean-up sites
  • Drainage water quality and volume at the long-term waste management
    facility site

Why is the project monitoring groundwater?

  • To ensure measures to protect and improve groundwater are effective

What measures is the project taking to protect groundwater?

  • Isolate the waste from the groundwater environment by constructing a
    multi-layered, engineered aboveground mound
  • Limit the depth of excavation at clean-up sites to above the groundwater table, whenever possible
  • Pump out groundwater accumulation in excavations, analyze and treat, if necessary, prior to discharge

How is the project monitoring groundwater?

  • Determine groundwater levels and flow direction from a network of monitoring wells within the site of the long-term waste management facility and at other major clean-up sites
  • Measure volume of treated groundwater pumped to Lake Ontario from the long-term waste management facility
  • Collect and analyze water samples for radiological and non-radiological contaminants from new and existing monitoring wells within the long-term waste management facility and at other major clean-up sites
  • Collect and analyze drainage water samples at the long-term waste management facility
  • Determine changes to groundwater flow patterns in the vicinity of the long-term waste management facility and Brand Creek through groundwater elevation contour mapping
  • Continue groundwater flow and water quality sampling at the long-term waste management facility and at other major clean-up sites following completion of the Project

 

Monitoring Surface Soil Quality

What is the project monitoring?

  • Contaminant concentrations in surface soil (radiological and non-radiological) at the boundary of major work sites to monitor for wind-blown dust

Why is the project monitoring surface soil quality?

  • To ensure measures to prevent dust from leaving work sites are effective

What measures is the project taking to protect surface soil quality?

  • Reduce airborne dust and its deposition by minimizing exposed excavation surfaces, moistening soil and using other dust mitigation measures
    (see Air Quality panel)
  • Limit the maximum distance equipment travels over waste at the long-term waste management facility to 50 m to reduce airborne dust
  • Erect control structures around work areas to prevent surface water and groundwater from flowing into or away from clean-up sites

How is the project monitoring surface soil quality?

  • Sample and analyze surface soil for radiological (thorium-230, etc.) and non-radiological (heavy metals) contaminants at the boundaries of the long-term waste management facility and the Highland Drive area clean-up sites to monitor for wind-blown dust

Soil quality and clean-up criteria

During the cleanup, another kind of soil quality monitoring, called verification, will be done. This will confirm that sites contaminated with low-level radioactive waste have been cleaned up to the required clean-up criteria. Verification is how the Project will determine when a property is clean.

Once contaminated soil has been removed from a property, soil samples will be collected and analyzed to verify the criteria have been met. Property owners will then be provided with a letter to confirm the cleanup of their property has been successfully completed.

May 7, 2014