I also requested renogiation on the salary when I came into Federal service. Did the HR specialist tell you that your renegotiated salary was accepted? The process is that if the hiring person agrees, then it has to be approved a few levels up. You should not languish awaiting a response — that is bad HR practice. Good for yo for asking for more money (few employees do that). Hope all works out. I am a native Washingtonian so I can say that DC is a great area to live. Good luck.