w777,
From an overrun point of view, that is plain scary:
In terms of approaching 28L, it's like flying over the lee side of a bullding.
Any time that you have lower terrain before the threshold and you have reasonably strong winds, you can anticipate turbulence and sink.
The strength of the turbulence and sink will depend upon the height of the runway above the terrain, the terrain slope and the strength of the wind.
Since there is a displaced threshold on 28L, I think crossing that "cliff" at 200' or above would minimize any problems, but still be prepared for some sink.
Have a look in any good gliding textbook for descriptions of flying at ridge-soaring sites for more information.
Incidentally, if you are approaching in a cross-wind, look out for hangars or other airport bulidings that are upwind. They can cause significant turbulence and sink.