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18-Geol-B1 Contaminant Hydrogeology: May 2018

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

  1. Question 1 Diffusion, Hydrolysis, Capillary Rise, Sorption-Retardation, and Contaminant Attenuation Processes
  2. Question 2 Column Breakthrough, an Instantaneous Aquifer Spill, and the Conceptual Site Model
  3. Question 3 Four-Phase Soil-Vapour Partitioning and NAPL-Mixture Equilibrium
  4. Question 4 Two-Layer Vadose-Zone Saturation Profile via Brooks-Corey and the Kelvin Equation
  5. Question 5 Capillary Barriers, Wetting-Front Advance, DNAPL Remediation, and Landfill Siting

Start with Question 1 →

National Exams — May 2018 — 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. 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-retardation, Henry's law and Raoult's-law NAPL partitioning, soil-vapour/gas-water-sorbed four-phase equilibrium; Domenico, P.A. & Schwartz, F.W., Physical and Chemical Hydrogeology (2nd ed., Wiley, 1997) — the Ogata-Banks column-breakthrough solution and the multidimensional instantaneous-source (Baetsle/Domenico-Robbins) transport 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 in the unsaturated zone; EGBC Geoscience Professional Practice Guidelines for assumption-disclosure conventions on open-book calculations.