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18-Geol-B1 Contaminant Hydrogeology: May 2017

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

  1. Question 1 Dispersion/Diffusion Fundamentals, Isotope Hydrology, and Effective Diffusion Coefficient
  2. Question 2 Contamination Sources, Hydrolysis Decay, Henry's Law Partitioning, and a Gasoline Mass Balance
  3. Question 3 Retarded Transport Velocity and a PCE Column Breakthrough with Biodegradation
  4. Question 4 An Instantaneous Chloride Pulse, Capillary Rise, and Brooks-Corey Vadose-Zone Moisture
  5. Question 5 Conceptual Site Models, Bioremediation Suitability, and Managing Residual Gasoline

Start with Question 1 →

National Exams — May 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; most call for an essay-format answer with clarity and organization counted. 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 and tortuosity, sorption/retardation, Henry's law partitioning, NAPL fate and free-product recovery, in-situ bioremediation; Domenico, P.A. & Schwartz, F.W., Physical and Chemical Hydrogeology (2nd ed., Wiley, 1997) — the Ogata-Banks advection-dispersion-reaction solution and the instantaneous-pulse (Gaussian) transport solution; Freeze, R.A. & Cherry, J.A., Groundwater (Prentice-Hall, 1979) — Darcy's law, isotope hydrology, and the Brooks-Corey capillary pressure-saturation relation; EGBC Geoscience Professional Practice Guidelines for assumption-disclosure conventions on open-book calculations.