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Industrial Waste Management Evaluation Model (IWEM)
- Background Information
- Download Model Files and User's Guide
- User's Guide
- Technical Background Document
Background Information
- The IWEM software is designed to assist you in determining the most
appropriate waste management unit design to minimize or avoid adverse
ground water impacts, by evaluating types of liners, the hydrogeologic
conditions of the site, and the toxicity and expected leachate concentrations
of the anticipated waste constituents.
- The software helps you compare the ground water protection afforded
by various liner systems with the anticipated leachate concentrations,
so that you can determine what minimum liner system is needed to be
protective of human health and ground water resources (or in the case
of land application units (LAUs), determine whether or not land application
is recommended).
- The anticipated users of the IWEM computer program are managers of proposed or existing units, state regulators, interested private citizens, and community groups.
In an effort to meet the needs of various stakeholders, the guidance for the ground water pathway uses a tiered approach that is based on modeling the fate and transport of waste constituents through subsurface soils and ground water to a well to produce a liner recommendation (or a recommendation concerning land application) that protects human health and the environment. The successive tiers in the analysis incorporate increasing amount of site-specific data to tailor productive management practices to the particular circumstances at the modeled site:
- Tier 1: A screening analysis based upon national distribution of data;
- Tier 2: A location-adjusted analysis using a limited set of the most sensitive waste- and site-specific data; and
- Tier 3: A comprehensive and detailed site assessment.
The IWEM software is designed to support the Tier 1 and Tier 2 analyses. The unique aspect of the IWEM software is that it allows the user to perform Tier 1 and Tier 2 analyses and obtain liner recommendations with minimal data requirements. Users interested in a Tier 3 analysis should consult the Guide for information regarding the selection of an appropriate ground water fate and transport model.
Download Model Files and User's Guide
For a discussion of the components of IWEM and important concepts necessary to understanding the effective use of the model, see Chapter 7 - Section A of the Guide.
To install and run IWEM, download all of the files below to the same directory and run iwemsetup.exe.
IWEM
Installation (EXE) (Executable file, 27.5MB)
(Estimated download times: 56k - 143 min; Cable/ISDN/DSN: 60 min; T1:
<3 min. Actual download time may vary depending on other factors including
Internet connection quality, computer speed, and network traffic.)
IWEM User's Guide
Due to the large file size of the IWEM User's Guide, it has been broken into the following separate files:
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Table of Contents and Introduction (PDF) (6 pp, 137 KB)
- Overview (PDF) (12 pp, 456 KB)
- System Requirements (PDF) (2 pp, 56 KB)
- IWEM Software Installation (PDF) (5 pp, 82 KB)
- Running the IWEM Software, Part 1 (PDF) (10 pp, 1.2 MB)
- Running the IWEM Software, Part 2 (PDF) (11 pp, 1.3 MB)
- Running the IWEM Software, Part 3 (PDF) (6 pp, 1 MB)
- Running the IWEM Software, Part 4< (PDF) (12 pp, 1.3 MB)
- Running the IWEM Software, Part 5 (PDF) (10 pp, 1.1 MB)
- Running the IWEM Software, Part 6 (PDF) (8 pp, 1.2 MB)
- Running the IWEM Software, Part 7 (PDF) (8 pp, 1.1 MB)
- Running the IWEM Software, Part 8 (PDF) (9 pp, 1.3 MB)
- Running the IWEM Software, Part 9 (PDF) (10 pp, 1.1 MB)
- Running the IWEM Software, Part 10 (PDF) (10 pp, 1.2 MB)
- Running the IWEM Software, Part 11 (PDF) (15 pp, 1.3 MB)
- Understanding Your IWEM Input Values (PDF) (28 pp, 486 KB)
- Understanding Your IWEM Results (PDF) (7 pp, 67 KB)
- Trouble Shooting (PDF) (2 pp, 43 KB)
- References (PDF) (1 pp, 35 KB)
- Appendix A:List of Waste Constituents (PDF) (5 pp, 42 KB)
- Appendix B: Sample Reports From Tier 1 and Tier 2 (PDF) (15 pp, 73 KB)
IWEM Technical Background Document
Due to the large file size of the IWEM Technical Background Document, it has been broken into the following sections:
- Table of Contents and Executive Summary (PDF) (23 pp, 228 KB)
- Introduction (PDF) (9 pp, 126 KB)
- Overview (PDF) (7 pp, 169 KB)
- What Is The EPACMTP Model? (PDF) (20 pp, 331 KB)
- How EPA Developed the Tier 1 and Tier 2 IWEM Evaluations (PDF) (67 pp, 979KB)
- Establishing Reference Ground-water Concentrations (PDF) (19 pp, 235 KB)
- How Does IWEM Calculate LCTVs and Make Liner Recommendations? (PDF) (15 pp, 183 KB)
- References (PDF) (4 pp, 106 KB)
- Appendix A: Glossary (PDF) (12 pp, 104 KB)
- Appendix B: List of IWEM Waste Constituents and Default Chemical Property Data (PDF) (6 pp, 139 KB)
- Appendix C: Tier 1 Input Parameters (PDF) (16 pp, 772 KB)
- Appendix D: Infiltration Rate Data (PDF) (15 pp, 528 KB)
- Appendix E: Background Information for the Development of Reference Ground-water Concentration Values (PDF) (57 pp, 307 KB)
- Appendix
F: Tier 1 LCTV Tables (PDF) (54 pp, 960 KB)
