233

Predictions of PVER made with this method were found to be comparable to
PVER determined from the column tests.
9.5 SUGGESTIONS FOR PARAMETERIZATION
Proper determination of the transport parameters (partition coefficient, rate
constant, and dispersion coefficient) is the first step in design of PRBs. These
parameters can be estimated using the equations presented in this study using
basic properties of foundry sands (i.e., TOC, clay content, total or zero-valent
iron content). These estimated parameters can be used for feasibility analysis
and preliminary design. Relatively simple batch tests can then be used to confirm
the partition coefficient and rate constant, and to refine the design. If parameters
from the batch tests are significantly different from the estimates, then column
tests should be conducted to obtain parameters for conditions that better
simulate the field.