18-Env-A6 Solid Waste Engineering and Management · December 2014
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Reference texts: Tchobanoglous, Theisen & Vigil, Integrated Solid Waste Management: Engineering Principles and Management Issues; Vesilind, Worrell & Reinhart, Solid Waste Engineering; Davis & Cornwell, Introduction to Environmental Engineering (6th ed.); CCME, Guidance Document on Landfill Gas Management; Canadian Environmental Protection Act, 1999.
This paper prints marks IN FRONT of the question number on every line (e.g. "5 1. What are the elements…", "4 16. All 29 questions are answered in full.
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
(1) Final cover/cap design and installation — the low-permeability barrier and vegetated topsoil system that controls infiltration, erosion and gas migration once the site stops receiving waste. (2) Post-closure leachate management — continued collection, treatment/discharge (or transition to passive management) as generation declines over the post-closure period. (3) Post-closure landfill gas management — continued extraction, flaring or energy recovery, and monitoring for off-site migration, until gas generation falls to background levels. (4) Long-term environmental monitoring and financial assurance — groundwater and gas monitoring for the full post-closure period (commonly 25–30 years under most Canadian provincial regulations), the proposed post-closure land use, and a funded financial assurance mechanism (trust fund/bond) to guarantee monitoring and maintenance continue even if the facility ownership changes.
