LeachXS™

LeachXS™ is a database/expert decision support system for characterization and environmental impact assessment based on estimated contaminant release as derived from leaching tests. Databases used by LeachXS™ include leaching for 600+ materials, scenarios, and regulations to allow comparisons of test data versus specific utilization or disposal conditions. The expert decision system assists in evaluation and laboratory guidance, data management and evaluation, source term description, impact evaluation, and decision analysis. Applicable materials for assessment using LeachXS™ include:

• Treated Wastes
• Stabilized Waste
• Construction
• Materials
• Cement Mortars and Concrete
• Soils and Contaminated Soil
• Sludge
• Compost
• Sediments
• Municipal Wastes
• Industrial and Hazardous Wastes
• Mining Wastes
• Preserved Wood

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ORCHESTRA

ORCHESTRA (Objects Representing CHEmical Speciation and TRAnsport models) is a computer program for modeling (geo)chemical speciation and mass transport processes.

ORCHESTRA is a modeling framework for defining state-of-the-art geochemical equilibrium models and combining these models with mass transport for user-defined processes. The ORCHESTRA chemical module can calculate chemical thermodynamic equilibrium in a similar way to well known speciation codes, but is internally organized very differently. Instead of defining all model equations within source code, equations are defined in a separate user accessible text file in ORCHESTRA.

ORCHESTRA has been used in practice for a wide range of applications that include aqueous speciation, precipitation, different forms of surface complexation, ion exchange, diffusion (including radial and electroneutral), convection, solid solutions, colloid adsorption, and biota uptake. Several international benchmarking studies have demonstrated the usefulness of ORCHESTRA in reactive transport modeling for a variety of scenarios.

ORCHESTRA Verification and Validation (V&V)

A concerted effort has been underway at Vanderbilt University and the Nuclear Research Group of the Netherlands (NRG) to verify and validate (V&V) relevant ORCHESTRA models, including monolith models related to the EPA 1315 monolith test as well as those for important aging and degradation phenomena like sulfate attack and carbonation. The V&V effort is consistent with NQA-1 (ASME NQA-1-2015) and DOE Order 414.1D (entitled Quality Assurance).

The V&V report and supporting test cases are available upon request from the Toolbox administrator. Please include the text Request for ORCHESTRA V&V Information in the title of your e-mail. A valid e-mail address should also be used because this address will be used to link the requester to the Box directory containing the most current ORCHESTRA V&V information.