FASTCHEM/trademark/ package: Volume 5, User's guide to the EICM (EPRI Interim Coupled Geohydrochemical Transport Model) coupled geohydrochemical transport code

This document is a user's manual and technical reference for the EPRI Interim Coupled Geohydrochemical Transport Model (EICM). The EICM code is a component of the Fly Ash and FGD Sludge Transport and Geochemistry (FASTCHEM/trademark/) code package. The EICM code performs the processing function of the FASTCHEM/trademark/ package on a mainframe computer, including the calculation of the subsurface transport of solutes and their geochemical interaction with the surrounding media. EICM uses a two-step coupling algorithm to simulate the transport of solutes. Geochemical processes included in the code include the effects of aqueous speciation, solid phase solubility, ion exchange, and specific-ion adsorption. Output from EICM consists of a printed record of the concentrations of the solutes, solids, and adsorbates along a one-dimensional streamtube as a function of time. Additional information about the thermodynamic activities of the aqueous chemical species can also be printed. The EICM code is an integral part of the FASTCHEM/trademark/ code package. A workstation preprocessor on a personal computer is used to develop conceptual models of geochemistry and transport and to create all EICM input files; it also functions as the link between the EICM simulation and the data provided by the ECHEM geochemical code and the ETUBEmore » streamtube definition code. The EICM code in turn produces a series of graphics output files that are used by the workstation postprocessor to plot the results of an EICM simulation. 11 refs., 26 figs., 11 tabs.« less