I am a volunteer at the Arthur Marshal Wildlife Refuge in Boynton Beach, Fl. There are contractor hired to go by air boat in to Everglades to clean out foreign trees, shrubs and grasses. This done to to stop the invasion of these non native plants from over taking the Everglades. The crews work in waders in alligator and snake infested watersfrom airboats. One of the contractors is SouthWestern Chemtreat of Chiefland, Fl, the thoer is Avcaquatic. This is a US Fish and Wildlife refuge. Please contact: Ms. Sylvia Palizza, Refuge Manager.