Hydraulic conductivity (m/y)
Hydraulic gradient (m/m)
Infiltration rate (m/y)
Length of source parallel to flow (m)
Aquifer depth (m)
Effective aquifer porosity (fraction)
Distribution coefficient (L/kg) -
if this is not known, set it equal to zero, and the value will be calculated from the inputs below
Bulk density of soil (g/cm
3
)
Fraction of organic carbon in soil
Octanol-water partition coefficient (L/kg)
(PCE - 468; TCE - 512; TCA - 112-309; DCA - 30; DCE - 72-135; Cl-Benzene - 725; C-Tet - 537; Benzene - 134; Toluene - 562; Ethylbenzene - 1380; xylene - 1479; VC - 32; PCA - 245)
Distance to nearest receptor (m)
Half life (y)
This is often a very large uncertainty. If biodegradation rates have not been measured at the site; 1. Chlorinated organics can be somewhat constrained through the use of the
AFCEE scoring system
, 2. For BTEX compounds, default half-lives of a month to a year are probably appropriate.
Maximum contaminant concentration at source (ppm)
Acknowledgment and Disclaimer
