The environmental PE exam is growing in popularity, as more engineers seek licensing in this discipline. This eight-hour, open-book exam, offered every April and October, consists of 80 multiple-choice problems.Our Environmental Engineering Reference Manual is the core text examinees need to prepare for and use during the exam. It reviews the current exam topics clearly and concisely and is replete with examples and practice problems reinforcing important concepts. Complete solutions to these problems are found in the Practice Problems book, which examinees can use to learn or refresh solving skills. -- Step-by-step solutions to all the practice problems in the Environmental Engineering Reference Manual