Following is a list of freeware that provides ools for investigating and cleaning up soil pollution. Before you access any software or apps, please read our disclaimer and permissions page if you haven't already done so.

2DFATMIC Source Code (for UNIX)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. FATMIC 2D (2DFATMIC) simulates subsurface flow, transport, and fate of contaminants which are undergoing chemical and/or biological transformations. The model is applicable to transient conditions in both saturated and unsaturated zones. The flow module is a Galerkin finite element solution of Richard's equation. The transport module is a hybrid Lagrangian-Eulerian approach with an adapted zooming and peak capturing algorithm. This model can almost eliminate spurious oscillation, numerical dispersion, and peak clipping due to advective transport.

3DFATMIC (for UNIX)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. FATMIC 3D (3DFATMIC) simulates subsurface flow, transport, and fate of contaminants which are undergoing chemical and/or biological transformations. The model is applicable to transient conditions in both saturated and unsaturated zones. The flow module is a Galerkin finite element solution of Richard's equation. The transport module is a hybrid Lagrangian-Eulerian approach with an adapted zooming and peak capturing algorithm. This model can almost eliminate spurious oscillation, numerical dispersion, and peak clipping due to advective transport.

Bioassay Quick Reference Table
By California Department of Toxic Substances Control. This guide is the prototype of a project aimed at creating an index of all the standard bioassays currently being used in the scientific community. Initially includes ASTM standards.

CalTOX
By California Department of Toxic Substances Control. A spreadsheet model that relates the concentration of a chemical in soil to the risk of an adverse health effect for a person living or working on or near the contaminated soil. CalTOX computes site-specific health-based soil clean-up concentrations given target risk levels or human health risks given soil concentrations at the site.

CHEMFLO (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. CHEMFLO enables users to simulate water movement and chemical transport in unsaturated soils by solving the Richards equation (water) and the convection-dispersion equation (chemicals).

Constant Flux Green Ampt Model
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. For the constant flux Green-Ampt water infiltration model, two formulations are required, one for the condition that the application rate (r) is less than the saturated hydraulic conductivity (Ks), and one for the condition that the application rate is greater than the saturated hydraulic conductivity. The model was developed using Mathcad and consists of Mathcad code.

CroPMan
By US Department of Agriculture, Natural Resources Conservation Service. A production-risk management model designed to help agricultural practitioners optimize crop management and maximize production and profit, to identify limitations to crop yield, to assist growers with replant decisions, and to identify best management practices that minimize the impact of agriculture on soil erosion and water quality. It is a windows-based application of EPIC (Environmental/Policy Integrated Climate model) originally developed by USDA-ARS that simulates the interaction of natural resources (soil, water, climate) and crop management practices to estimate impacts on harvested crop yield, soil properties, soil erosion, profitability, and nutrient/pesticide fate. Only available to researchers.

Emsoft Exposure Model for Soil-Organic Fate and Transport
By US Environmental Protection Agency, National Center for Environmental Assessment (NCEA). A screening model that may be used 1) to determine concentrations of contaminants remaining in the soil over a given time (when the initial soil concentration is known); 2) to quantify the mass flux (rate of transfer) of contaminants into the atmosphere over time; and 3) to subsequently calculate contaminant air concentrations by inputting mass flux values into atmospheric dispersion models.

Erosion-Productivity Impact Calculator (WinEPIC)
By US Department of Agriculture, Natural Resources Conservation Service. Assesses the effect of soil erosion on soil productivity. Also called Environmental Policy Integrated Climate.

Explicit Green Ampt Model
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. This model yields cumulative infiltration and the infiltration rate as an implicit function of time (i.e., given a value of time (t), values of the cumulative infiltration (I) and the infiltration rate (q) can be directly obtained). The model was developed using Mathcad and consists of Mathcad code.

HSSM (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. HSSM simulates flow of the LNAPL phase and transport of a chemical constituent of the LNAPL from the surface to the water table; radial spreading of the LNAPL phase at the water table, and dissolution and aquifer transport of the chemical constituent.

HSSM (Hydrocarbon Spill Screening Model) - Windows
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. HSSM simulates flow of the LNAPL phase and transport of a chemical constituent of the LNAPL from the surface to the water table; radial spreading of the LNAPL phase at the water table, and dissolution and aquifer transport of the chemical constituent.

HSSM - Modelo de evaluación de derrames de hidrocarburos (en Espanol)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. Simula el flujo de la fase LNAPL (líquidos livianos en fase no acuosa) y el transporte de un componente químico por estos líquidos desde la superficie hasta las napas freáticas; la difusión de la fase LNAPL en la napa freática; y la disolución y el transporte acuífero del componente químico.

Hydric Soil Series List (National)
By US Department of Agriculture, Natural Resources Conservation Service. Information on hydric soils (soils that are sufficiently wet in the upper part to develop anaerobic conditions during the growing season). View in PDF format or database format.

Infiltration/Exfiltration Model
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. The vertical movement of water in the soil profile from the surface to water table can be conceptualized as being composed of two predominant processes: 1) infiltration and 2) exfiltration. Exfiltration can be envisioned as the processes dominating during drying periods, and water released during this period can be thought of as being released through evaporation to the atmosphere. Infiltration and exfiltration as described in this application assumes the soil medium to be effectively semi-infinite and the internal soil water content at the beginning of each storm event and inter-storm period is assumed to be uniform at its long-term and space-time average. The model was developed using Mathcad and consists of Mathcad code.

Internet Geographical Exposure Modeling System (IGEMS)
By US Environmental Protection Agency, Office of Pollution Prevention and Toxics (OPPT). IGEMS is a modernization of OPPT's older Graphical Exposure Modeling System and PCGEMS tools. IGEMS brings together in one system several EPA environmental fate and transport models and some of the environmental data needed to run them. IGEMS includes models and data for ambient air, surface water, soil, and ground water, and makes the models much easier to use than their stand-alone counterparts. IGEMS will have graphics and Geographical Information System (GIS) capabilities for displaying environmental modeling results.

Johnson and Ettinger Model for Subsurface Vapor Intrusion into Buildings
By US Environmental Protection Agency, Office of Solid Waste and Emergency Response. A series of models for estimating indoor air concentrations and associated health risks from subsurface vapor intrusion into buildings.

Layered Green Ampt Model
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. This model could be utilized for the determination of water infiltration over time in vertically heterogeneous soils. The model was developed using Mathcad and consists of Mathcad code.

MMSOILS (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Multimedia Contaminant Fate, Transport, and Exposure Model (MMSOILS) estimates the human exposure and health risk associated with releases of contamination from hazardous waste sites. The methodology consists of a multimedia model that addresses the transport of a chemical in groundwater, surface water, soil erosion, the atmosphere, and accumulation in the foodchain. The human exposure pathways considered in the methodology include: soil ingestion, air inhalation of volatiles and particulates, dermal contact, ingestion of drinking water, consumption of fish, consumption of plants grown in contaminated soil, and consumption of animals grazing on contaminated pasture.

MULTIMDP (MULTIMED Daughter Process) (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Multimedia Exposure Assessment Model (MULTIMED) for exposure assessment simulates the movement of contaminants leaching from a waste disposal facility. The MULTIMED model has been modified (MULTIMDP) to simulate the transport and fate of first- and second-generation transformation (daughter) products that migrate from a waste source through the unsaturated and saturated zones to a downgradient receptor well.

NAPL Simulator - 2D (DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. NAPL Simulator conducts a simulation of the contamination of soils and aquifers which results from the release of organic liquids commonly referred to as Non-Aqueous Phase Liquids (NAPLS).

NAPL Simulator - 3D (DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. NAPL Simulator conducts a simulation of the contamination of soils and aquifers which results from the release of organic liquids commonly referred to as Non-Aqueous Phase Liquids (NAPLS.

National Soil Information System (NASIS)
By US Department of Agriculture, Natural Resources Conservation Service. A tool to help you create and maintain soil surveys

NCSS Soil Characterization Database
By US Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center. Contains pedon data from analyses for soil characterization and research within the National Cooperative Soil Survey.

Official Soil Series Descriptions
By US Department of Agriculture, Natural Resources Conservation Service. Descriptions of the taxa in the series category of the national system of classification of soils.

PESTAN (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. PESTAN is used to estimate the vertical migration of dissolved organic solutes through the vadose zone to ground water. Estimates are based on a closed-form analytical solution of the advective-dispersive-reactive transport equation. The model is intended for use in conducting initial screening assessments of the potential for contamination of groundwater from currently registered pesticides and those submitted for registration.

Philip's Two Term Model
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. The Philip's Two-Term model (PHILIP2T) is a truncated power series solution developed by Philips (1957) for water infiltration. Philips (1957) suggested the use of the two-term model in applied hydrology when t is not too large. The model was developed using Mathcad and consists of Mathcad code.

Preliminary Remediation Goals (PRG) for Radionuclides
By US Environmental Protection Agency, Office of Solid Waste and Emergency Response. Find risk-based PRGs calculated using default input parameters and the latest toxicity values. In addition, you are able to modify the input parameters to create site-specific PRGs to meet the needs of your Superfund site.

PRZM3 (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). PRZM3 (Pesticide Root Zone Model 3) is the most recent version of a modeling system that links two subordinate models--PRZM and VADOFT--in order to predict pesticide transport and transformation down through the crop root and unsaturated zone.

RETC (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. RETC is a program for analyzing the hydraulic conductivity properties of unsaturated soils.

RITZ (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. RITZ is a screening level model for simulation of unsaturated zone flow and transport of oily wastes during land treatment. RITZ was developed to help decision makers systematically estimate the movement and fate of hazardous chemicals during land treatment of oily wastes. The model considers the downward movement of the pollutant with the soil solution, volatilization, and loss to the atmosphere, and degradation.

SCS Model
By US Soil Conservation Service and US Environmental Protection Agency, Office of Research and Development, NRMRL Center for Subsurface Modeling Support. The SCS (Soil Conservation Service) Model is an emperically developed approach to the water infiltration process. It has been developed by first finding a mathematical function whose shape as a function of time matches the observed features of the infiltration rate. The model was developed using Mathcad and consists of Mathcad code.

Soil and Water Assessment Tool (SWAT)
By US Department of Agriculture, Natural Resources Conservation Service. A river basin scale model developed to quantify the impact of land management practices in large, complex watersheds

Soil Screening Guidance for Chemicals
By US Environmental Protection Agency, Office of Solid Waste and Emergency Response. A tool for screening at National Priorities List (NPL) sites.

Soil Series Classification by Query (with FTP option)
By US Department of Agriculture, Natural Resources Conservation Service. Contains the taxonomic classification of each soil series identified in the United States and other information about the soil series, such as office of responsibility, series status, dates of origin and establishment, and geographic areas of usage.

Soil Series Classification Data
By US Department of Agriculture, Natural Resources Conservation Service. Enables you to view classification data on a single soil series.

Soil Series Classification National Reports
By US Department of Agriculture, Natural Resources Conservation Service. Enables you to create a report based on the national list of soil series. Reports include Soil Series Report, Soil Series with States and SOI-5s Using Report, Soil Family Report, and Inactive Soil Series Report.

Soil Series Classification Report for a List of Soil Series
By US Department of Agriculture, Natural Resources Conservation Service. Enables you to create a report based on a soil series. Reports include Soil Series Report, Soil Series with States and SOI-5s Using Report, and Soil Family Report.

Soil Survey Manuscripts
By US Department of Agriculture, Natural Resources Conservation Service. Prototypes of on-line soil survey manuscripts. Most of these are in PDF format; some are in HTML format or a combination of HTML and PDF.

State Soil Geographic (STATSGO2) Data Base
By US Department of Agriculture, Natural Resources Conservation Service. Soil maps for the State Soil Geographic (STATSGO2) data base are made by generalizing the detailed soil survey data.

SUTRA (for Windows)
By US Geological Survey (USGS). A finite-element simulation model for saturated-unsaturated, fluid-density-dependent ground-water flow with energy transport or chemically-reactive single-species solute transport. SUTRA may be employed for areal and cross-sectional modeling of saturated ground-water flow systems, and for cross-sectional modeling of unsaturated zone flow. SUTRA Version 2D3D.1 includes both 2D and 3D simulation capability. The 2D portion of the code represents the same hydrologic processes as earlier versions and is conceptually unchanged, and the 3D portion of the code represents the same processes as the 2D portion, but in three spatial dimensions.

SUTRA-GUI (for Windows 95/98 and NT)
By US Geological Survey (USGS). Preprocessor and postprocessor graphical-user interface for preparing SUTRA input data and for viewing model output for use within Argus Open Numerical Environments (Argus ONE). Source code is available.

US EPA Johnson & Ettinger Models (with California Health Criteria) (Groundwater Contamination)
By California Department of Toxic Substances Control. Estimates human health risks from subsurface vapor intrusion into buildings. Incorporates human health criteria specific to California, as developed by the Cal/EPA Office of Environmental Health Hazard Assessment (OEHHA).

US EPA Johnson & Ettinger Models (with California Health Criteria) (Soil Gas Contamination)
By California Department of Toxic Substances Control. Estimates human health risks from subsurface vapor intrusion into buildings. Incorporates human health criteria specific to California, as developed by the Cal/EPA Office of Environmental Health Hazard Assessment (OEHHA).

UTCHEM (PC version)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. Originally a three-dimensional finite difference model for multiphase flow, transport and chemical flooding, the UTCHEM code has been modified to transform it into a general purpose NAPL simulator. Appropriate physical, chemical and biological process models have been incorporated into the simulator to create a 3D multiphase multi-component model capable of simulating the fate and transport of NAPL's in the saturated and unsaturated zones of aquifers.

UTCHEM (UNIX version)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. Originally a three-dimensional finite difference model for multiphase flow, transport and chemical flooding, the UTCHEM code has been modified to transform it into a general purpose NAPL simulator. Appropriate physical, chemical and biological process models have been incorporated into the simulator to create a 3D multiphase multi-component model capable of simulating the fate and transport of NAPL's in the saturated and unsaturated zones of aquifers.

VLEACH (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. VLEACH is a one-dimensional, finite difference model for making preliminary assessments of the effects on ground water from the leaching of volatile, sorbed contaminants through the vadose zone. The program models four main processes: liquid-phase advection, solid-phase sorption, vapor-phase diffusion, and three-phase equilibration. Modeling results in an overall, area-weighted assessment of ground-water impact.

VS2DI (for Windows)
By US Geological Survey (USGS). Simulates water flow and solute transport in variably saturated porous media. Source code is available.

WATERSHEDSS
By North Carolina State University (NCSU) Water Quality Group. WATERSHEDSS (WATER, Soil, and Hydro- Environmental Decision Support System) was designed to help watershed managers and land treatment personnel identify their water quality problems and select appropriate best management practices.

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This page last updated on 9/29/16