Cayman Islands: Integrating noise into environmental due diligence A major waste-to-energy facility planned for Grand Cayman would be located near residential areas, making noise a primary community concern. As part of the Environmental Impact Assessment, GHD conducted baseline measurements and used CadnaA (Computer Aided Noise Abatement), a software tool for environmental noise assessment, to predict noise levels during both construction and operation. This will allow the project team to test design scenarios and incorporate mitigation measures (such as silencers, barriers and low-noise equipment) well before any construction begins. Addressing acoustic impacts early will allow the project to avoid later conflicts and demonstrate that community considerations are being built into decision-making. Incorporating noise into formal due diligence will support both regulatory compliance and public trust. Northern Canada: Designing for quiet in remote communities In Northern Ontario, we worked with Hydro One Remotes, an electric utility, to assess and upgrade generator stations that supply power to isolated communities. In these locations, even one nearby home is considered when evaluating potential noise impacts. Travel to carry out site work requires multiple flights, and facilities operate in challenging conditions — factors that make early decisions especially important. On-site measurements and Ontario’s NPC-300 environmental noise guidelines 5 were used to evaluate the impacts of ageing diesel generators. The assessment showed that replacing older units with newer, quieter and more energy-efficient generators would deliver better long-term performance than retrofitting the existing equipment. The upgrade reduced noise exposure, improved reliability and cut the required number of maintenance trips into remote communities. These projects highlight a consistent principle: treating noise as a core design variable yields better outcomes for both infrastructure owners and the communities they serve.
Case-study comparison: Cayman Islands vs Northern Ontario Different settings, same lesson: treating noise as a design variable improves outcomes for communities and owners.
Cayman
Northern Ontario
Context Near residential areas Method Baseline measurements + CadnaA predictions Design response Barriers/silencers/ low-noise equipment Outcome Earlier mitigation + trust
Context Remote communities with single nearby homes considered Method On-site measurements + NPC‑300 guideline assessment Design response Replace ageing diesel generators with quieter units Outcome Reduced exposure + reliability + fewer maintenance trips
Nexus Magazine | GHD | 31
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