Computer Modeling of Saltstone Landfills by Intera Environmental Consultants Page: 4 of 61
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E. L. ALBENESIUS
The Model
A saturated-unsaturated finite element computer code of
groundwater flow was used to evaluate the various landfill designs.
The computations were two-dimensional and were based on
cross-sections taken perpendicular to the trenches (Figure 1).
Landfills were evaluated at steady-state flow assuming continuous
infiltration of water at a rate of 15 inches per year. There are
small variations in the water flux at depth during extended wet or
dry periods. However, to insure that these variations do not
significantly effect the predicted release rates or the water
quality downflow of the burial area transient cases (varying
moisture flux) will be modeled by Intera in future studies.
Unsaturated hydraulic conductivity data used for soil, clay,
and saltstone were average curves for these types of materials
since specific data were not available. Future studies will
include calculations using actual unsaturated hydraulic
conductivity values for the specific materials. Little change in
salt release is expected with these refined calculations.
Saturated hydraulic conductivity data were supplied to Intera from
SRL studies (Table 1).
The most important information that Intera provides to SRL
from the model is the fraction of the total recharge (percolating
rainwater) that flows through the saltstone blocks. Laboratory
experiments have shown that water flowing through saltstone comes
out saturated with salts. The composition of this saturated salt
solution is shown in Table 2. It is assumed, for making estimates
of contaminant release from saltstone, that any water flowing
through a saltstone block exits with this salt content (53,600 ppm
N) and that this solution is then diluted by the water which has
been diverted around the saltstone block.
Nitrogen releases in this report are calculated as follows:
recharge water passing through
ppm N in saturated solution x saltstone
total recharge water
= (53600 ppm N) x fraction of recharge through
saltstone
The Original Saltstone Landfill (Cases A and B)
The first saltstone landfill modeled by Intera was the
original reference disposal system containing eight-2-
DPST-83-529
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Albenesius, E.L. Computer Modeling of Saltstone Landfills by Intera Environmental Consultants, report, August 9, 2001; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc723343/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.