Superfund Chemical Data Matrix (SCDM)
The Superfund Chemical Data Matrix (SCDM) is a source for factor values and screening concentration benchmarks that can be applied when evaluating potential National Priorities List (NPL) sites using the Hazard Ranking System (HRS). Factor values are part of the HRS mathematical equation for determining the relative threat posed by a hazardous waste site and reflect hazardous substance characteristics, such as toxicity and persistence in the environment, substance mobility and the potential for bioaccumulation. Screening concentration benchmarks are environment- or health-based substance concentration limits, including some developed by or used in other EPA regulatory programs. SCDM contains HRS factor values and screening concentration benchmarks for hazardous substances that are frequently found at sites evaluated using the HRS, as well as the physical, chemical and radiological data used to calculate those values. The accompanying SCDM Methodology report describes how data are selected or calculated for inclusion in SCDM.
On January 30, 2014, the EPA released an updated SCDM with many revisions to the HRS factor values and benchmarks. These revisions were necessary because of updates to some of the toxicity data, as well as updates to several of the equations used to determine screening concentration benchmarks. This update also provides increased consistency across EPA programs. The factor values and benchmarks provided in this January 2014 update supersede any previous values.
The Superfund Chemical Data Matrix (SCDM) contains factor values and benchmarks used for applying the Hazard Ranking System (HRS) [40 CFR Part 300 Appendix A, 55 FR 51583] to evaluate potential National Priorities List (NPL) sites. The physical, chemical, toxicological and radiological parameters used to calculate the factor values and benchmarks are obtained from references listed in the SCDM Methodology. The references and the data extracted from these references were selected to meet specific HRS requirements and conditions which may not be applicable or representative for other uses. In addition, the parameter values are updated only on an "as needed" basis. As a screening tool, the HRS and SCDM are used for quickly assessing sites at the screening stage and data used to perform this task may not be applicable for other site specific purposes.
The parameter values in SCDM should be used for HRS and NPL purposes only.
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Superfund Chemical Data Matrix Report
- SCDM Methodology Report PDF
- Appendix A - Chemical Data, Factor Values and Benchmarks for Chemical Substances PDF
- Part 1 - Acenaphthene to Cesium (PDF) (74 pp, 669K)
- Part 2 - Cesium 137(+D) (radionuclide) to Dichloropropane, 1,2 (PDF) (74 pp, 749K)
- Part 3 - Dichloropropene, 1,3- to Hexachlorodibenzofuran 1,2,3,7,8,9 (PDF) (74 pp, 624K)
- Part 4 - Hexachlorodibenzofuran 2,3,4,6,7,8- to Plutonium 236 (radionuclide) (PDF) (82 pp, 701K)
- Part 5 - Plutonium 238 (radionuclide) to Thorium 231 (radionuclide) (PDF) (72 pp, 676K)
- Part 6 - Thorium 232 (radionuclide) to Zinc 65 (radionuclide) and Footnotes (PDF) (68 pp, 615K)
- Appendix BI - Hazardous Substance Factor Values (PDF) (13 pp, 391K)
- Appendix BII - Hazardous Substance Benchmarks (PDF) (29 pp, 1.6MB)
- Appendix C - Hazardous Substance Synonyms Report (PDF) (11 pp, 135K)
- Appendix C - Hazardous Substance Synonyms Report (xls) (35K)
There is 1 new entry (PDF) (1 pg, 32K) (with a new CAS Number) in the January 2014 version of SCDM that was not in the 2004 version or in the interim reports published between 2004 and 2014. No entries were removed in the January 2014 version of SCDM.
NOTE: Please do not assume that any substance not listed in the January 2014 SCDM cannot be used for HRS scoring. The number of entries in SCDM was greatly reduced in the 2004 version of SCDM to save resources in developing, updating and tracking changes in chemical properties. If values are needed for a substance that is not listed in the January 2014 SCDM and are thought to be critical to the listing decision, please request the value by calling the SCDM contact listed below. For all technical questions concerning SCDM, please contact the contact listed below.
For SCDM information, contact:
Linda Gaines, Ph.D., P.E. (email@example.com)
US Environmental Protection Agency
1200 Pennsylvania Avenue, N.W.
Washington, DC 20460
Phone: (703) 603-7189