Went back and found the post on avsim where afcad maker Jim Vile found the texture bleed through problem with KATL (its post # 115):
Checked this and, it's not exactly the same issue, because both our main airport elevation and all the runways were set exactly to the same height to the latest decimal. However, they where both set at 12.9999 ft, and the flatten mesh we included with 1.0.3 patch is set at 13.018049ft so maybe the issue is similar.
I think it IS video-card dependent, because it might be related to the Z-buffer resolution.
Find attached a modified AFCAD, is exactly the same than the one that comes with the scenery, but the altititude is set to 13.2 ft, which should be enough.
Let me know how it works because, I can't see any difference with either AFCADs (I'm using an ATI, BTW)