In August 2006, UM agreed to reimburse the Army Corps of Engineers $393,473 for clean-up costs under the Superfund law. Its six buildings provide  to currently house: the Global Public Health Research Group, Miami Institute for Human Genomics, Forensic Toxicology Laboratory (for analysis of DUI suspect blood samples), and Microbiology and Immunology. The University of Miami once planned to build a south campus on the property but opted to sell 80 acres of land instead. The university no longer owns land at the south campus. The Richmond campus is a site that was formerly the United States Naval Observatory Secondary National Time Standard Facility, which already had buildings and a 20M antenna used for Very Long Baseline Interferometry (VLBI). The Rosenstiel School's Center for Southeastern Tropical Advanced Remote Sensing (CSTARS) and Richmond Satellite Operations Center (RSOC) have research facilities on part of the new campus. Since 2005, UM has a "Green U" initiative which includes LEED certification for buildings and the use of biofuels by the campus bus fleet. UM established the Abess Center for Ecosystem Science and Policy. As a part of the Abess Center, UM launched the R.J. Dunlap Marine Conservation Program to educate students on the importance of protecting the marine environment. In 2019, undergraduates were composed of: 23 percent from the Greater Miami area, 10 percent from other parts of Florida, 51 percent from other U.S. states, and 15 percent were international students. Graduate students were composed of: 42 percent from the Greater Miami area, 11 percent from other parts of Florida, 28 percent from other U.S. states, and 19 percent were international students. As of 2012, UM reported the following graduation rates: 70 percent graduating within 4 years, 80 percent graduating within 5 years, and 82 percent graduating within 6 years. Male student-athletes have a 56 percent graduation rate, and 67 percent of female student-athletes graduate within 6 years. There are currently 2,697 full-time faculty members, with 98 percent of regular faculty holding doctorates or terminal degrees in their field. UM has a student-faculty ratio of 12:1. The University of Miami is accredited by the Southern Association of Colleges and Schools and 19 additional professional accrediting agencies. It is a member of the American Association of University Women, the American Council on Education, the American Council of Learned Societies, the Association of American Colleges and Universities, the Florida Association of Colleges and Universities, the Independent Colleges & Universities of Florida, and the National Association of Independent Colleges and Universities.