You are more than half way there. Most of your courses can be used for a civil engineering degree. In fact if you get a PE, in most states, the PE can be used in any field. However, you should take courses to know the material.
Go to your local Civil engineering school with your transcript. Have them review it, and tell you which courses can be applied to the Civil engineering degree. With luck, you may only require a hand full of courses.
Cheers and good luck!