Development of Simulators for In Situ Remediation Evaluation, Design, and Operation

Four simulators for modeling in situ, subsurface remediation were advanced and incorporated into the Groundwater Modeling System (GMS) during SERDP Project Cu-1062. The four simulators are MT3DMS/SEAM3D, UTCHEM, NUFT, and OS3D. The addition of these four simulators to the GMS provides a significant advancement in the present status of subsurface modeling for remediation alternatives evaluation and design. Each of these four simulators has unique capabilities for simulating innovative in situ treatment technologies, including intrinsic and engineered bioremediation, surfactant and cosolvent flushing to remove oil phase contaminants, venting technologies (e.g., soil vapor extraction, air sparging, and bioventing), and in situ chemical treatment (e.g., Fe deg permeable treatment walls). Each of the simulators was modified/improved, documented, validated against field-scale studies, and incorporated into the GMS. The GMS models will provide an invaluable tool for improving subsurface, in situ remediation selection, design, and operation, thus potentially providing significant reductions in site cleanup costs. This report provides an overview of results of the CU-1062 project and recommendations for future enhancements to the simulators. --Original contains color plates: All DTIC reproductions will be in black and white.