Autzen was not built on a landfill! The landfill was Day Island and is South East of Autzen, see link below. I believe this is incorrect. Day Island Landfill was operating from 1963 to 1974, Autzen was built in 1967. The site can not be built on to this day, as it is not stable for foundations to sit on. 

https://maps.google.com/?ll=44.049774,-123.056359&spn;=0.005113,0.013078&t;=h&z;=17

(71.220.203.185  )