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That was present in the vicinity and mix it with the cement and create concrete. So there is no quality control. The strength of that wall various props varies from batch to batch, but it is safe. That is a gatt that is a gravity wall with a buttress in it. The diagonal strokes are buttressedes to keep the wall from moving. The wall is actually providing support to the house is above. You cannot tolerate any movement. So they put these angles of concrete called buttresses. What would be under that . That is the cathedral at the corner of california and taylor. The rock under here is franciscan...

Cannot stand there anymore and it fell. This slide is a long sansome street, where the city chose to protect sansome street and the cars, and they built this catchment wall. The sole purpose of this wall is to catch rocked that falls from private property. And every year or two, we get a call saying that rocks have fallen down the road and spilled over. This is the famous slide where we had a building at the top fall down this hill. This is the 22 street building. This was a watercolor done in 1945 by david mandel which by david mandelowiz. This building started gradually falling and sliding d...

depression, they really gave 100% to the work they were doing. even today, these walls, there is very little movement in these walls, they are performing well. you can check them against earthquake loads, there are more than adequate to resist any earthquake load that you can throw at them. i applaud the results of that stimulus package. >> this particular slide illustrates a bunch of things. one, the hill seemed beyond going down after the lower roadway, goes down quite steeply to pastry -- to bay street and soon thereafter hits the point where there is artificial fill. so you can s...

great depression. it is known as the noriega wall, the leavenworth wall. they were well engineered. at that time, because of the depression, they really gave 100% to the work they were doing. even today, these walls, there is very little movement in these walls, they are performing well. you can check them against earthquake loads, there are more than adequate to resist any earthquake load that you can throw at them. i applaud the results of that stimulus package. >> this particular slide illustrates a bunch of things. one, the hill seemed beyond going down after the lower roadway, g...

safely predict -- developed safely. and the filbert street stairs, because of the rockfall that occurred, new stairs were built, and they were built in a manner that when rockfalls occur, that actually lift out the stairs and put them on the ground and allow the crane to get back there to access the rockfall. >> beyond that, the building that we see at the bottom of the rockfall was actually designed to allow barack to fall off and be compounded by the building -- actually designed to allow barack to fall off and be impounded by the building. >> that is the corner of sansome and gree...