I passed the Civil exam (Str depth) in October '07, so my exam did not have the Construction section. I felt that the morning section was relatively easy, and I only used the CERM and an Environmental dictionary that I downloaded and printed for free (sorry, I can't remember where I got it from). The dictionary probably was not needed, but saved me some time.
That said, I studied a LOT. 25hrs/week for 4 months... probably 75% of that was for morning topics that I had to relearn because I had forgotten it all.
So, yes, the CERM is enough...