No, that isn't the latest topo map of the area, it's the same vintage as the one previously posted by aterpster:
My mistake.
I downloaded it from the US Geological Survey website and assumed it was a contemporary map. It is actually from 1978.
But as Sorry Dog (who is local to the area) says, the grading was done between the foot of the hill and the end of RWY18. In that case we can assume that the ridge shown is 794’ MSL as the FAA notice will have used information from an actual survey of the terrain and the hill top remains unaltered from 1978.
When I said initial impact I meant with the ground rather than the trees as I was referring to the area contained within the portion of the map I posted.