If a site is considered significant and eligible for the National Register of Historic Places, a cultural resource management plan must be developed to address potential impacts to the site. Federal projects require a Memorandum of Agreement, which SouthArc can negotiate. Avoidance and preservation are always the preferred alternatives, but if that is not possible, additional research and documentation will be required. Historic properties are documented by large-scale photography and measured drawings to the standards of the Historic American Building Survey(HABS) or Historic American Engineering Record (HAER), along with extensive historic research, including oral histories. Archaeological sites usually require extensive excavation accompanied by specialized artifact studies such as faunal and botanical analyses, radiocarbon dating or other dating techniques.