SEVIEW (SESOIL/AT123D) replaces our old software package RISKPRO (SESOIL & AT123D). RISKPRO was discontinued in 2005. SEVIEW SESOIL/AT123D also incorporates SESOIL and AT123D and a host of additional features. SEVIEW (SESOIL/AT123D) contains everything needed to perform contaminant transport and fate modeling. SESOIL is an unsaturated soil zone transport and fate model that produces a soil leachate concentration. The AT123D groundwater model can be used alone or linked to the SESOIL vadose zone model. The SESOIL to AT123D link produces a resulting groundwater concentration, even if the point of compliance is directly beneath the contaminated soil. The AT123D results can be many orders of magnitude lower than those produced by simplistic methods such as the Summers Model and Dilution-Attenuation Factor equation. SEVIEW (SESOIL/AT123D) also provides a link between SESOIL and the MODFLOW / MT3D numerical groundwater models. SEVIEW (SESOIL/AT123D) can now be used to run your BIOSCREEN and BUSTR-Screen models in AT123D. AT123D results are typically one to three orders of magnitude lower than those produced by BIOSCREEN and BUSTR-Screen. This means you can significantly reduce your cleanup costs simply by running AT123D. By using the BIOSCREEN and BUSTR-Screen interfaces means that AT123D is just as easy to run.
Unsaturated Soil Zone Transport and Fate Model
SESOIL is a one-dimensional vertical transport screening-level model for the unsaturated (vadose) zone that simulates RNA based on diffusion, adsorption, volatilization, biodegradation, cation exchange and hydrolysis. SESOIL is an acronym for the Seasonal Soil compartment model. It contains three submodels that simultaneously simulate contaminant transport, soil water movement and soil erosion. It is the vadose zone model by which all other vadose zone models are judged. What sets SESOIL apart is its ability to simulate seasonal climatic variations and varying soil properties with depth. Contaminant transport can be simulated:
- Without biological decay, or
- With biodegradation simulated as a first-order decay process.
SESOIL 7.1 now includes a value for the water diffusion coefficient. This parameter is not used by SESOIL and is simply passed on to AT123D. Version 7.1 of SESOIL also includes a modification to the method of reading input files. This means that the user no longer needs to make changes to the config.sys and autoexec.bat files for SESOIL to run.
Establish Site-Specific Cleanup ObjectivesSESOIL can be used to simulate the fate of residual contaminant levels in soil to establish site-specific cleanup objectives. It can also simulate time-dependent releases from underground storage tanks, landfills and agricultural practices. The public domain version of SESOIL was enhanced to simulate up to 999 years of contaminant transport. SEVIEW links the time-dependent contaminant load to groundwater from SESOIL to the AT123D and BIOSCREEN groundwater models.
All SESOIL Parameters on One ScreenSEVIEW includes sophisticated input screens in which all SESOIL and AT123D input parameters can be entered. The input parameters are presented in tab-organized input screens which are linked to a journal. Input parameters are simply entered and the changes are automatically saved by moving to the next model scenario in the journal or by closing the setup window. This means you do not have to individually open and save each model input file in separate windows. This dramatically reduces the time it takes to establish model scenarios. Quality control is also improved because all of the input parameters can now be quickly scanned.
Climatic DatabaseSEVIEW includes a climatic database that contains information on monthly air temperature, cloud cover, relative humidity, short wave albedo, precipitation, length of storm events, number of storms and the distribution of storms for 6,674 cities in the US, Guam, Puerto Rico, and Virgin Islands.
Chemical DatabaseSEVIEW includes chemical information for 695 chemicals. This database includes: CAS registry number, chemical formula, water solubility, air diffusion coefficient, water diffusion coefficient, Henry's Law constant, organic carbon adsorption coefficient, molecular weight and liquid phase biodegradation rate data.
SEVIEW produces four separate SESOIL reports:- Climate Report
- Profile and Load Report
- Hydrologic Cycle Report
- Pollutant Cycle Report
Groundwater Transport and Fate Model
AT123D is a generalized three-dimensional groundwater transport and fate model. AT123D is an acronym for Analytical Transient 1-, 2-, and 3-Dimensional Simulation of Waste Transport in the Aquifer System. It simulates contaminant transport under one-dimensional groundwater flow. Transport and fate processes simulated include advection, dispersion, diffusion, adsorption and biological decay. Contaminant transport can be simulated:
- Without biological decay, or
- With biodegradation simulated as a first-order decay process.
Version 7.1 of AT123D can simulate over 1,000 years of contaminant transport and contains a correction to the steady state algorithm.
Establish Site-Specific Cleanup ObjectivesAT123D can model the time-dependent contaminant releases from the SESOIL vadose zone model. AT123D was enhanced to simulate up to 1,000 years of contaminant migration when linked to SESOIL. Results can be used to estimate how far a contaminant plume will migrate and can be compared to groundwater standards to evaluate risk at specific locations and times. AT123D is an analytical model. This means that contaminant concentrations are determined independently for each node and there is no need to establish a dense grid network of nodes.
All AT123D Parameters on One ScreenChemical Database
SEVIEW includes a 1,575 record database for 695 chemicals. This database includes: CAS registry number, chemical formula, water solubility, air diffusion coefficient, water diffusion coefficient, Henry's Law constant, organic carbon adsorption coefficient, molecular weight and liquid phase biodegradation rate data.
SEVIEW produces three separate AT123D reports. The AT123D results can be viewed as animated area or centerline plots. Or you can view contaminant concentrations through time at specific locations. These reports present trends in groundwater concentrations that can be compared to groundwater standards.
Animated Area Concentration Report
The AT123D area report displays animated contaminant plume concentrations for the entire area modeled. This report also contains tabulated model results and a summary of the input parameters. A copy of the report at any time step can be printed.
Animated Centerline Report
The AT123D centerline report displays animated contaminant concentrations through the center of the plume. This report also contains a table of the results and a summary of the input parameters, in addition to the graphs. As with the area report, the user can print select time steps.
Point of Compliance Report
The AT123D point of compliance, report presents trends in groundwater concentrations at a single point such as a groundwater monitoring well or property boundary. This report can be generated at any of the three-dimensional points modeled. As with the other AT123D reports, this report contains a summary of the input parameters.
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