Most sites that score above a 28.5 are considered remedial sites. Remedial sites go on the National Priorities List (NPL), meaning they are scheduled for long-term cleanup. Landfills, dumps and abandoned chemical plants are examples of remedial sites. Removal sites are sudden environmental emergencies that are not on the NFL. Mercury spills, oil tanker spills and factory fires are examples of removal sites. After a Superfund site is identified, an initial cleanup is made. Studies are performed to determine what kind of hazardous waste is on the site and what risk it poses to the environment. Then the EPA decides how to clean up the site. The method of cleanup usually involves human labor, chemical treatment, and some construction. After construction is completed, the site is monitored to make sure no waste is leaking into the air, soil, surface water, or groundwater