Final answer:
The Shepherds must conduct an environmental analysis and possibly a Section 106 review to ensure that their potential home building site does not contain hazardous materials and does not adversely affect any Native American cultural sites.
Step-by-step explanation:
Your buyer clients, the Shepherds, looking at unimproved lots with the intention of building a custom home, will require some form of environmental analysis to identify the presence of hazardous materials as part of the buying and planning process. Hazardous waste facilities decisions are often predicated on the economic, geological, and political factors of a site. Specifically, it's essential that the site has a soil type and geological profile that can prevent hazardous materials from seeping into local aquifers, which would be of particular concern when building a residential property.
Additionally, due to the provisions of the National Historic Preservation Act (NHPA), a Section 106 review might be necessary to assess any potential impact on Native American cultural sites. The review process involves consultation with State Historic Preservation Offices (SHPOs) and Tribal Historic Preservation Offices (THPOs) to determine if there are any historical implications for the chosen property site. This consideration is key, as various cultural and environmental matters must be addressed before construction can proceed.