DO has been actively engaged in numerous subdivision developments over the years. For this commercial subdivision project, an initial Site Investigation had identified a former landfill in part of the site.
Due to the potential for waste and generation of ground gases beneath proposed buildings, we completed a ground gas investigation to assess the levels of methane and carbon dioxide in the ground and potential risk they may present to the development. Methane and carbon dioxide generated in waste may enter into a building through service entry points or defects in foundations. Once within the building, if present in significant concentrations, methane may form an explosive mixture with oxygen, while carbon dioxide may displace oxygen presenting an asphyxiation risk.
The site investigation included the installation of several permanent shallow ground gas monitoring wells screened within the waste. Gas monitoring was then completed on numerous occasions to evaluate gas concentrations and flow rates under various atmospheric conditions.
An assessment of gas risk was also completed in accordance with international standards identified elevated methane present within the ground gas monitoring wells. The assessment included evaluating the potential risk of gas migration into the proposed building. The investigation findings were then used to produce a ground gas mitigation design to be incorporated by the project team into the foundation structural designs ensuring the safety of future occupants and longevity of the development.
DO has been actively engaged in numerous subdivision developments over the years. For this commercial subdivision project, an initial Site Investigation had identified a former landfill in part of the site.
Due to the potential for waste and generation of ground gases beneath proposed buildings, we completed a ground gas investigation to assess the levels of methane and carbon dioxide in the ground and potential risk they may present to the development. Methane and carbon dioxide generated in waste may enter into a building through service entry points or defects in foundations. Once within the building, if present in significant concentrations, methane may form an explosive mixture with oxygen, while carbon dioxide may displace oxygen presenting an asphyxiation risk.
The site investigation included the installation of several permanent shallow ground gas monitoring wells screened within the waste. Gas monitoring was then completed on numerous occasions to evaluate gas concentrations and flow rates under various atmospheric conditions.
An assessment of gas risk was also completed in accordance with international standards identified elevated methane present within the ground gas monitoring wells. The assessment included evaluating the potential risk of gas migration into the proposed building. The investigation findings were then used to produce a ground gas mitigation design to be incorporated by the project team into the foundation structural designs ensuring the safety of future occupants and longevity of the development.
