Looks like as of April 2019 the environmental exam will be taken on a computer and it will no longer be open book as it is now (only the NCEES PE Environmental Reference Handbook will be allowed).
https://ncees.org/engineering/pe/environmental/
Did anyone else see that the exam is being reduced from 100 questions to 80?
Just released by NCEES: https://ncees.org/wp-content/uploads/PE-Env-April-2018.pdf