Final answer:
An environmental impact study is required for Grey Water Disposal to assess effects on water, air, and wildlife as well as to consider economic and geographic impacts.
Step-by-step explanation:
Grey Water Disposal must conduct an environmental impact study before building a landfill outside Cincinnati. This study is crucial in assessing the potential effects on the water supply, air conditions, and local wildlife. Factors like the cost of land, geological suitability, and political climate also come into play when making decisions about siting hazardous waste facilities.
Economic and geographic impacts related to natural resource policies and regulations will need to be carefully considered, as well as public concerns about the health of communities and ecosystems that could be affected by the development.