I just received this article from Kelly Bloom of Soapalooza and thought it worth reading. I have always cleaned up lye spills with water first per the instructions that come with my msds sheets from the chem house I purchase in bulk from. Interesting this just came in my email after reading about the posting of the Volcano effect
http://www.soapalooza.com/blog/2014/01/how-to-handle-a-lye-spill/
http://www.soapalooza.com/blog/2014/01/how-to-handle-a-lye-spill/