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18-Geol-B1 Contaminant Hydrogeology: December 2017

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Solute Dispersion – Continuous and Instantaneous Sources, Degradation Half-Life
  2. Question 2 Column Breakthrough, Vapour-Water Partitioning, and Retarded/Decaying Transport
  3. Question 3 Four-Phase Partitioning of Benzene and Toluene (No NAPL)
  4. Question 4 Capillarity – Rise in a Tube, a Non-Wetting Droplet Between Plates, and Total TCE Mass
  5. Question 5 Vadose-Zone Moisture Profiles, Brooks-Corey Parameter Fitting, and Wetting-Front Advance

Start with Question 1 →

National Exams — December 2017 — 04-Geol-B1 Contaminant Hydrogeology. Three-hour, open-book exam; any non-communicating calculator permitted. Five questions constitute a complete paper and all five are of equal value (20 marks each per the printed marking scheme). Unless stated otherwise, water density = 998 kg/m³, water viscosity = 0.001 kg/m-sec, g = 9.81 m/s², 1 atm = 101300 Pa, and R = 8.314 Pa·m³/gmol·K = 0.082 atm·L/mol·K.

Reference texts: Fetter, C.W., Contaminant Hydrogeology (2nd ed., Prentice Hall, 1999) — molecular diffusion/tortuosity, sorption (Kd-Koc-Kow correlations), Henry's-law and four-phase partitioning, NAPL fate, capillarity and vadose-zone water potential; Domenico, P.A. & Schwartz, F.W., Physical and Chemical Hydrogeology (2nd ed., Wiley, 1997) — the Ogata-Banks advection-dispersion-reaction solution (with and without first-order decay) and the 2-D instantaneous-source (Gaussian puff) solution; Freeze, R.A. & Cherry, J.A., Groundwater (Prentice-Hall, 1979) — Darcy's law, the Brooks-Corey capillary pressure–saturation relation, and Green-Ampt infiltration theory; EGBC Geoscience Professional Practice Guidelines for assumption-disclosure conventions on open-book calculations.