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Question 4 (10 marks) A large volume of T richloroethene (TCB) has been released into the subsurface. The TCE
has penetrated the water table and is moving vertically downwards through a sandy
aquifer before accumulating on top of a layer of silt. The sand has a porosity of 0.33, an organic carbon content of 1.5 %, and a dry unit density of 2.5 g/cm3.
The sand and the silt layer have the following Brooks-Corey parameters sand: 9. = 2.8 it: 1. = 2.5
Pa = 3000 Pa Pd = 3500 Pa
S,=0.15 S,=0.10 TCE has the following properties
density: 14?O g/l
solubility: 1100 mg/l
K0c = 126 ml/g In answering the questions below, clearly state all assumptions made: a) What head of TCE must accumulate above the silt layer before penetration of this layer
occurs? b) What is the total mass of TCE in a one litre volume of the sand layer immediately
above the silt layer, at the time of penetration? What is the proportion of this mass in the
aqueous, non-aqueous and soil phases?

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