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UTCHEM is a multi-phase flow and transport model developed by the Center for Petroleum and Geosystems Engineering at the University of Texas at Austin. UTCHEM is ideally suited for pump and treat simulations, particularly the simulation of surfactant-enhanced aquifer remediation (SEAR), and DNAPL transport.  UTCHEM is a mature model that has been widely used.  The UTCHEM solver is efficient and robust.