- St. Marks National Wildlife Refuge Fall 2018 Environmental Education Internship. Work hours will normally be 80 hours over a 2-week period, although additional work hours may be required during especially busy times early in the morning, at night, and/or on weekends. The position may require walking through difficult terrain in hot/cold and buggy conditions. Inclement weather, poisonous plants, stinging insects and venomous snakes are inherent dangers in this work environment. Application deadline: July 31, 2018.