The contamination is detailed in documents made public as part of federal litigation over the now-closed facility. Advocates say it fits a pattern of migrant incarcerations in harmful environments.By Amy GreenMigrant children incarcerated at a now-closed facility next to an Air Force Reserve base outside of Miami were exposed to toxic chemicals such as arsenic and lead, which are linked with developmental harm and cancer, according to more than 20,000 pages of records released as part of federal litigation over the site.