16-Civ-A3 Elementary Environmental Engineering · December 2018
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. National Exams, December 2018 — 16-Civ-A3 Elementary Environmental Engineering. Three hours; closed book with one candidate-prepared 8½ × 11 double-sided aid sheet; approved Casio or Sharp calculator only. Seven problems are printed, each worth 20 marks, and any five constitute a complete paper (maximum 100 marks). All seven are solved here, because the set is intended as a study resource rather than an exam script. Section marks are shown in brackets at the left margin of each question and are reproduced from the final-page Marking Scheme.
Reference texts.
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.
An environmental impact assessment (EIA) is a structured, front-loaded planning tool that identifies, predicts and mitigates the environmental consequences of a project before commitments are locked in, when changes are cheapest. For a large biodiesel facility the impacts are dominated not by the plant fence-line but by the agricultural supply chain, so the EIA must be applied on a life-cycle (cradle-to-grave) basis. Scoping and baseline: the assessment first bounds the study — feedstock cultivation (sugar cane, maize or soybean), transport, oil extraction and transesterification, glycerol by-product handling, and end-use combustion — and establishes baseline conditions for soil, surface and groundwater, biodiversity and air quality. Impact prediction: the principal concerns are land-use change and possible deforestation for feedstock, loss of biodiversity and soil carbon, fertiliser and pesticide runoff causing eutrophication, high irrigation water demand, and net greenhouse-gas balance once indirect land-use change is counted. Mitigation via the hierarchy (avoid → minimise → mitigate → offset): site on degraded or existing farmland rather than clearing forest; adopt best-management agronomy (buffer strips, precision fertilising, integrated pest management) to cut runoff; recycle process water and capture and sell glycerol and press-cake as co-products; and recover process heat. Link to life-cycle cost: because operating and maintenance costs track resource and pollution intensity, the same measures that reduce environmental damage also reduce whole-of-life cost — lower fertiliser and water purchases, avoided effluent treatment and regulatory penalties, revenue from co-products, and reduced remediation liability. The EIA therefore feeds directly into a management and monitoring plan with measurable indicators, closing the loop through adaptive management over the plant’s life. In the Canadian frame this follows the Impact Assessment Act and provincial EA processes.
Taking the recirculating aquaculture system (RAS) salmon project to full commercialization, the two sustainable-development goals selected are SDG 12 (Responsible Consumption and Production) and SDG 14 (Life Below Water). RAS is well suited to both because it grows fish in closed, land-based tanks that reuse water and contain waste, displacing open-net-pen farming that stresses wild stocks and coastal waters.
| Strategy | SDG 12 — Responsible production | SDG 14 — Life below water |
|---|---|---|
| 1. Closed-loop water recirculation & treatment | Cuts freshwater withdrawal >90% vs flow-through; minimises resource use per kg fish | Prevents nutrient/effluent discharge to receiving waters, avoiding coastal eutrophication |
| 2. Solid-waste & nutrient recovery (sludge → fertiliser/biogas) | Converts a waste to a co-product; closes the material loop | Removes the nutrient load that would otherwise reach aquatic ecosystems |
| 3. Land-based biosecurity (no escapes, no sea-lice transfer) | Reduces chemical/antibiotic use and losses, improving yield efficiency | Protects wild salmon genetics and stocks from escapes, disease and parasites |
Together these strategies decouple protein production from wild-fishery pressure and from coastal-water pollution, which is precisely the intent of the two goals.
The engineer’s duties are ordered by the canons, and where they conflict the paramountcy clause governs. (a) Faithful agent: the engineer owes the client competent, diligent service, so the first step is internal and professional — document the observation, raise the apparent flow-capacity testing error promptly and in writing with the client and the responsible engineer of record, and request that the test be repeated to the specification. Being a faithful agent does not mean concealing a defect to protect the schedule or budget; it means protecting the client from the far larger liability of a failed station. (b) Objective and truthful statements: the engineer must report only what the data support — state the measured discrepancy and its potential consequences factually, avoid overstating or understating, and keep a clear record; any statement to the owner, regulator or public must be accurate and within the engineer’s area of competence. (c) Paramountcy of public safety: inadequate capacity risks sewage overflow to the environment and backups into basements — a public health and safety hazard. If, after raising the issue, the testing is not corrected and the station could be commissioned with unverified capacity, the engineer must escalate: withhold approval, notify management and, if still unresolved, report to the regulator/authority having jurisdiction (EGBC and the applicable environmental authority). The public interest overrides loyalty to the employer and commercial pressure. The correct sequence is thus: verify and document → raise internally as a faithful agent → insist on truthful, corrected testing → and, if unresolved, exercise the duty to report to protect the public.
