what is the other thin that is bad about serpentineite? it contains naturally occurring asbestos, which is a carcinogen, known carcinogen. if you go to where st. mary's cathedral is, cathedral hill, that is one of the outcrops. there is a high percentage of serpentinite in the rock. in the old days, the 1930's, 1920's, san franciscans to not bother to deal with the disposal companies. they would take their garbage out the other side of twin peaks, bump their garbage, and shovel sand on top of it. so in the old days, you could go out there and build your home and be surprised that you would find sanitary landfill or construction debris landfills. they were prevalent out there. >> this is twin peaks? >> going up to twin peaks. >> one form does not change much. >> eucalyptus trees have got much taller. that is not halt leading up to predict that is the hill leading up to there. fifth avenue, that area of san francisco. ucsf. that is this area right here. >> it is an earthquake hazard micro zone. >> again, another example of the wpa. the stree