Where archaeological requirements apply to a site of proposed development, if no significant archaeological or other cultural property sites are found in the impacted area, construction may proceed as planned, often with the requirement that archaeologists are on-site providing a watching brief. If potentially significant remains are found, construction may be delayed to allow for evaluation of the site or sites found within the impacted area. This is done to determine the archaeological site's true significance. If archaeologists determine the site contains important/significant cultural remains, the adverse effects on the site must be mitigated. Site mitigation can involve avoiding the site through redesigning the development or excavating only a percentage of the site. In the U.S., these restrictions involve any federal project involving the possible disturbance of cultural resources and can also extend to state and private developments if they involve public waterways or federal funds.