Let's hope he's a lot more careful with the chemicals than the early chip makers were. Most are now Superfund sites:

https://en.wikipedia.org/wiki/Category:Superfund_sites_in_Ca...

These are just the semiconductor manufacturer names I recognize offhand. Many more companies on the full list:

   Advanced Micro Devices
   Fairchild Semiconductor
   Hewlett-Packard
   Intel
   Intersil
   Monolithic Memories
   National Semiconductor
   Synertek