18-Env-A1 Principles of Environmental Engineering · December 2014
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
National Exams — December 2014 — 04-Env-A1 / Principles of Environmental Engineering. 3 hours duration; closed book with an 8.5×11 in double-sided aid sheet; Casio or Sharp approved calculator only. Any five questions constitute a complete paper (first five answers marked); all seven are solved below for completeness. Each question is worth 20 marks.
Reference texts. Davis & Cornwell, Introduction to Environmental Engineering (6th ed.); Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery (5th ed.); 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, 1999 (CEPA); Andrews, Canadian Professional Engineering and Geoscience (professional ethics).
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.
Population intensification in cities and industrial growth in rural areas load the same three environmental receptors (airshed, water resources, solid waste) through different mechanisms, which is why the exam frames the answer as a 3×2 matrix: it forces a distinct impact-and-solution pair to be identified for every driver/receptor combination rather than one generic answer repeated twice.
| 2 Impacts & 2 Solutions | (i) Population Intensification (Urban) | (ii) Industrial Growth (Rural) |
|---|---|---|
| Air Shed | Impacts: rising vehicle-kilometres travelled raising mobile-source $\text{NO}_x$/CO; increased space-heating emissions from higher building density. Solutions: transit-oriented development and densification along transit corridors to cut vehicle trips; district-energy/low-emission heating retrofit incentives. | Impacts: $\text{SO}_2$/$\text{NO}_x$ and particulate emissions from new rural process plants; odour and fugitive-dust nuisance in previously low-emission airsheds. Solutions: flue-gas desulphurization/selective catalytic reduction on new stacks; fugitive-dust management plans and setback buffers from residences. |
| Water Resources | Impacts: impervious-surface stormwater runoff and combined-sewer overflow risk as density rises; wastewater-treatment-plant capacity strain. Solutions: low-impact development (bioswales, permeable pavement, green roofs); staged sewer/treatment-plant capacity expansion tied to a growth management plan. | Impacts: industrial effluent loading (BOD, metals) to rural streams with little dilution/assimilative capacity; process cooling/intake water withdrawal from a small rural watershed. Solutions: pretreatment/discharge permits with effluent limits set for the receiving stream's low flow; closed-loop cooling-water recirculation. |
| Solid Waste Impacts | Impacts: rising municipal solid waste generation per capita as density increases; construction/demolition debris from infill development. Solutions: curbside recycling/organics diversion programs scaled to higher-density collection; C&D waste diversion and reuse requirements. | Impacts: industrial process waste and packaging volumes new to a rural region with limited existing disposal infrastructure; hazardous by-product waste requiring transport to distant licensed facilities. Solutions: industrial waste-minimization/pollution-prevention programs; regional hazardous-waste transfer and manifest system sized for the new rural generator. |
Read down any column, the pattern is the same driver working through three different pathways; read across any row, the same receptor absorbing two different drivers — which is the practical value of the matrix for a planner allocating monitoring and mitigation budget between a growing city and a newly industrializing rural region.
