Table 2.

Input parameters used in 3-D simulation (unless otherwise noted in the figures and table)

Building/foundation parameters

Foundation foot print length: 10 m, width: 10 m

Depth of foundation (df): 0.1 and 2 m

Crack/foundation slab thickness (dck): 0.152 m

Crack width (wck): 0.005 m

Crack area (Ack): 0.199 m2

Volume of intruded area (Vb): 3.66 × 102 m3

Air exchange rate in intruded volume (Ae) 0.25 hr−1

Depth to groundwater/source (dsource) 3, 5, 8, 11, 14, 18 m bgs

3-D Finite Element Analysis Parameters

Size of the grid elements: 0.001 m – 1 m

Number of elements: 200k – 600k

Contaminant vapor source properties

Contaminant: TCE

Diffusivity of TCE in crack (Dck): 7.4 × 10−6 m2/s

Diffusivity of TCE in air (Dg): 7.4×10−6 m2/s

Effective diffusivity of TCE in soil (Deff): 1.04 × 10−6 m2/s

Soil gas flow properties

Viscosity of air/soil gas (μg): 1.8648 × 10−5 kg/m/s

Density of air/soil gas (ρg): 1.1614 kg/m3

Soil permeability (k): 10−10, 10−11, 10−12, 10−13 and 10− 14 m2

Total soil porosity (φt): 0.35

Soil porosity filled with gas (φg): 0.296