In 2001, the United States Navy left western Vieques, which had been used as an ammunition depot. Now the United States Fish and Wildlife Service controls 3,100 acres (13 km²) of this land — about half of the formerly owned military property. Over the course of U.S. Navy occupancy, nearly 22 million pounds (10,000 tonnes) of military and industrial waste, such as oils, solvents, lubricants, lead paint, acid and 55 US gallon (200 L) drums, were deposited on the western portion of the island. As cited by McCaffrey, according to the Universidad Metropolitana, the extent of leaching is unknown. In 2005 the Navy was investigating 17 potentially contaminated sites.