You should also consider NCSU in Raleigh, as the SW program there has an internship relationship with the VA for 2nd year students.
Best possible advice: Demonstrate that you can expand your comfort zone 24-7. Ask about taking any graduate level SW class that will help you get that gpa up and will also demonstrate your commitment to the field. Examine the curricula of the programs before you commit to a class, as many grad level classes will not transfer. Check those admissions criteria and if the programs require BIO or Stats then be in touch with the program about the best classes to take. If you are concerned about your gpa and can't take grad level courses (NCSU and UNC-CH can be strict about that gpa issue) then look at UNC-Greensboro and Appalachian State in NC. References need to be top notch. Your essay needs to be succinct, address the admissions questions asked, and must use excellent grammar.
Communicate with the admissions staff in the program! Be formal in your language (please no emails from your phone that starts off, "hey..." Write questions down before you call or email. Be patient and be polite when you contact folks; they are often juggling multiple tasks and they can provide the most accurate and helpful information to you any step along the way. You need them.
Graduate school is the first step in your professional career, whether you have been working in that field or not. Treat the application process as such and your chances will be exponentially improved.