Draft Internal Memorandum
D R A F T
Internal Memorandum
21 January 2004
Page 6
GeoSyntec Consultants
assimilate arsenic (through sorption and complexation) and therefore predict whether
arsenic that leaches from a landfill would have significant impacts to groundwater.
The compliance boundary question can be addressed using any number of solutions that
can be categorized as “Kd-approach” models. Most commonly used transport models
and analytical solutions would fall into this category. They are relatively simple to set
up and can estimate a “rate” of arsenic movement (for a fixed source input) by
estimating a site-specific distribution coefficient (Kd). Many of these models can also
predict a maximum concentration for a particular point in time or space. They do not
address the “assimilative capacity” issue that was discussed in the previous paragraph.
Moreover, most assume a linear sorption isotherm which does not limit the amount of
solute that can be sorbed by the aquifer matrix.
RECOMMENDATIONS
Following further evaluation of the data by the Groundwater Subcommittee and
collection of additional information from FDEP for specific landfill sites, we
recommend that the CCA TAG define their objectives (specifically, which of the three
questions above need to be answered and/or are there others that need to be answered).
Once the objectives are defined, an appropriate model(s) can be developed to answer
the specific issues of concern.
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