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Drilling and Monitoring Wells

Many financial transactions and/or property sales are conditionally based on the findings of a Phase II Environmental Site Assessment. Subsurface soil and groundwater investigations are mandatory requirements of Phase II Environmental Assessments, and are conducted to determine whether or not contaminants are present at a specific site.

Some properties require subsurface soil and groundwater investigations prior to any financial or real estate transaction. These properties are currently or historically associated with:

    • Industrial processes or activities
    • Automotive services
    • Fuelling Facilities
    • Dry-cleaning activities

Subsurface soil and groundwater investigations may also be performed to define the extent of subsurface contamination during a cleanup or remediation project, for example, delineating an underground oil or diesel plume resulting from a spill, or for analyzing for contaminant concentrations to determine whether remediation is even necessary.

Subsurface Investigation

The Ministry of the Environment and Conservation and Parks (MECP) provides guidance and procedures on soil and groundwater sample handling and analytical methods for sites in Ontario. Subsurface soil and groundwater investigation determines specific soil composition at specific depths and water table depths for sampling and monitoring purposes. The data collected is vital in determining whether or not remediation is necessary, to what extent the material is impacted and, if needed, to be able to apply the best remedial method for the existing conditions.

      • Soil Sampling

Split-spoon sampling and soil core sampling are methods used to collect soil samples. Split-spoons are stainless steel sampling tubes that are driven into the ground through a borehole that has been prepared by a drill rig equipped with a hollow stem auger. Soil core sampling is done with a direct push system that drives a stainless steel device loaded with a plastic liner into the subsurface soils.

      • Groundwater Sampling

Groundwater samples are collected through monitoring wells installed using a drill rig equipped with a hollow stem auger. Monitoring wells must be properly developed and registered in compliance with the Ontario Water Resources Act. When the monitoring wells are no longer in use, they must be decommissioned as required by regulation.

 Drill Rig Augering versus Direct Push System

Drill Rig Equipped with Hollow Stem Auger

      • Able to bore deeper
      • Used for installation of groundwater monitoring wells
      • More robust, able to bore through hard soil types

Direct Push System

      • More portable – can also be used indoors
      • Can be adapted for bioremediation injections
      • No soil cuttings to remove

Both methods provide continuous and/or discreet interval soil samples that are undisturbed.


Adaptable Drilling

Comco Canada Ltd. owns and operates all the required equipment for augering, installing monitoring wells, and engaging in split spoon or direct push soil core sampling. Owning the proper equpment allows Comco to carry out accurate sampling at a variety of sites under varying site conditions at lower cost and greater coverage. Comco is registered with the Ministry of the Environment and Conservation and Parks (MECP) as a licensed well contractor. Our team of knowledgeable certified Well Technicians have successfully drilled boreholes collected soil and groundwater samples and installed and decommissioned monitoring wells at numberous sites throughout the Ontario. Comco Canada Ltd. has more than 50 years of experience and has developed an excellent reputation for delivering quality work at reasonable cost to our clients.