The environmental considerations when installing a substation are appearance, sound, and ________.

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The main idea is limiting environmental risks alongside aesthetics and noise. Substations use transformers filled with insulating oil, so having oil spill containment is essential to prevent leaks from contaminating soil and groundwater. That containment protects the environment directly by providing a physical barrier and plans for containment and cleanup. While concerns like noise reduction, air quality, or wildlife management are important in broader environmental planning, they don’t address the specific, common hazard posed by transformer oil leaks as clearly as containment measures do.