Identification of Garden Snake

HI, i would like to know if any one could help me on identifying a snake i found under a concrete slab today. It was around 6:00pm, and it is all grey with a cream colored belly, its abut 1ft long, and it has a somewhat smaller head than its body, please reply if you have ANY idea what this might be. I have a Southern Hognose snake (endangered), and please also let me know if this snake may be able to be contained in captivity with this snake if you think you know what it may be, thank you.

Post a picture and you will be more likely to get a proper identification.

As to keeping it with a snake you already have, bad idea. If you do decide to keep it (after catching it legally) keep it in its own enclosure. If not legally caught, I recommend you let it go. By the way, this is the 2nd post, I think, wherein you say you are keeping an endangered species. Have you made certain that if necessary you have acquired the license(s) and proper paperwork to keep an endangered species?