Subsurface simulation models play key roles in the management and remediation of pollution sites. Geohydrology conceptual models provide hydrogeological information required by subsurface simulation models. In order to develop subsurface models which are applicable to Taiwan contaminated sites, this project is to enhance groundwater simulation models with gas diffusive transport capabilities and substantially modify core modules of subsurface flow, thermal transport, and reactive biogeochemical transport (2D HGC 4.X and 3D HGC 5.X). This project also establishes guidelines for constructing hydrogeological concept models and develop modeling platform and graphical users interface (GUI). The package developed in this project has been applied to simulate and evaluate a real site. Eight modeling examples were conducted in the project. These include investigating the transport, dispersion-diffusion, and adsorption-desorption of chlorinated organic contaminants, benzene, and mercury. Six cases are two-dimensional problems and two cases are three-dimensional problems. Extensive reaction networks for each case were considered. Six two dimensional problems are (1) transport of TCE, (2) bioremediation of TCE, (3) transport of Benzene, (4) chemical oxidation of Benzene with Fenton, (5) transport of mercury, and (6) diffusion of vapor mercury. Cases (2) and (4) were extended to three-dimensional problems. Finally, using subsurface modeling platform with graphical users interface (GUI) and enhanced geo-hydrologic conceptual model developed in this project, bioremediation of TCE with injection of lactate at Touciao industrial park has been demonstrated. All results show that the tools developed in this project can appropriately simulate the remediation phenomena.

Subsurface Environment, Model Analyses and Applications, Integrated Platform