Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
National Exam — December 2015 — 04-Env-A1 Principles of Environmental Engineering (Closed Book, 3 hours; candidate-prepared 8½×11" double-sided aid sheet permitted). Any five (5) of the seven (7) problems below constitute a complete paper; all seven are solved here as a full study resource.
Reference texts: Davis & Cornwell, Introduction to Environmental Engineering, 6th ed.; Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery, 5th ed.; Mihelcic & Zimmerman, Environmental Engineering: Fundamentals, Sustainability, Design; MWH's Water Treatment: Principles and Design, 3rd ed.; Guidelines for Canadian Drinking Water Quality (Health Canada); Canadian Council of Ministers of the Environment (CCME) water quality guidelines; Canadian Environmental Protection Act (CEPA, 1999).