The WMPT is a joint product of EPA�fs Office of Solid Waste (OSW) and EPA's Office of Pollution Prevention and Toxics (OPPT). It provides a screening-level assessment of potential chronic (i.e., long-term) risks to human health and the environment.
The relative chemical rankings derived from the WMPT can complement other risk or cost information in the decision-making process. 

This document provides background and technical documentation for the Revised WMPT as used for input to the RCRA PBT List process. The document includes background on the technical approach used in the Revised WMPT along with technical information on the WMPT spreadsheets included in the RCRA PBT List docket.

The WMPT remains a work in progress. EPA plans to re-release the WMPT in Windows format by early 1999.
 

PREFACE ii

ACRONYMS AND ABBREVIATIONS viii
 

CHAPTER 1: BACKGROUND INFORMATION AND FUTURE PLANS

CHAPTER 2: OVERVIEW OF REVISED WMPT

2.1	Persistence, Bioaccumulation, and Toxicity (PBT)
2.2	Scoring Algorithm
2.3	Universe of Chemicals of Concern for RCRA PBT List
2.4	Consideration of Additional Data Sources
2.5	Elemental Metals and Metal Compounds
2.6	References

CHAPTER 3: PERSISTENCE SCORING

3.1	Overview of Persistence and the Decision to Use a Partitioning Model 3.1.1 Comments Received 3.1.2 Consultation with Experts
3.2	Models Considered and Model Selection
3.3	Spreadsheet Partitioning Model 3.3.1 Overview 3.3.2 Formulas Included in the Spreadsheet Partitioning Model 3.3.3 Model Limitations and Issues
3.4	Input Parameters 3.4.1  Constants and Conversion Factors 3.4.2  Modeled Environment 3.4.3  Compartment-specific Parameters 3.4.4  Emission Rates 3.4.5  Chemical Properties and Data Sources 3.4.6  Acceptable Temperature Range for Data 3.4.7  Persistence Data Preference Hierarchy 3.4.7.1 Data Included 3.4.7.2 Data Not Included 3.4.8  Half-life Data 3.4.8.1 Handbook of Environmental Degradation Rates 3.4.8.2 Illustrated Handbook of Physical-Chemical Properties and Environmental Fate of Organic Chemicals 3.4.8.3 Mercury Study Report to Congress 3.4.8.4 Agricultural Research Service Pesticide Properties Data Base 3.4.8.5 AOPWIN 3.4.8.6 Ultimate Survey Model 3.4.8.7 HYDROWIN 3.4.9  Melting Point, Vapor Pressure, n-Octanol-Water Partition Coefficient, and Henry's Law Constant 3.4.9.1 PhysProp 3.4.9.2 MPBPWIN 3.4.9.3 KOWWIN 3.4.9.4 HENRYWIN 3.4.10 SMILESCAS 3.4.11 Chemical Type 3.4.12 Roadmap of the Spreadsheet Partitioning Model Input Data Spreadsheet 3.4.13 Quality Assurance of the Spreadsheet Partitioning Model Input Data Spreadsheet 3.4.14 Issues
3.5	Fenceline Determination
3.6	Scoring of Elemental Metals
3.7	Roadmap for the Persistence Spreadsheet
3.8	Quality Assurance of Spreadsheet Partitioning Model Output and Persistence Scores
3.9	References

CHAPTER 4: BIOACCUMULATION SCORING

CHAPTER 5: HUMAN TOXICITY SCORING

CHAPTER 6: ECOLOGICAL TOXICITY SCORING

6.1	Scoring Algorithm
6.2	Ecological Toxicity Data Preference Hierarchy 6.2.1 Data Included 6.2.2 Data Not Included
6.3	Sediment Quality Criteria Tier I FCV
6.4	Great Lakes Water Quality Initiative Tier I FCV
6.5	Ambient Water Quality Criteria FCV
6.6	Great Lakes Water Quality Initiative Tier II SCV
6.7	OPPT Measured Data
6.8	OPPT Predicted Data
6.9	Great Lakes Water Quality Initiative Tier I FAV
6.10	Ambient Water Quality Criteria CMC
6.11	OERR Aquatic Toxicity RQ
6.12	AQUIRE
6.13	TSCA Section 8(e) Triage Screening Results for Aquatic Toxicity Study Types
6.14	ECOSAR
6.15	Fenceline Determination
6.16	Scoring of Elemental Metals
6.17	Roadmap for the Ecological Toxicity Spreadsheet
6.18	Quality Assurance of Ecological Toxicity Scores
6.19	Issues
6.20	References

CHAPTER 7: HUMAN HEALTH AND ECOLOGICAL CONCERN SCORING

7.1	Score Aggregation Algorithm
7.2	Roadmap for the Human Health and Ecological Concern Scores Spreadsheet
7.3	Quality Assurance of Human Health and Ecological Concern Scores
Appendix A:	Printout of the WMPT Persistence Scores Spreadsheet
Appendix B:	Printout of the WMPT Bioaccumulation Scores Spreadsheet
Appendix C:	Printout of the WMPT Human Noncancer Scores Spreadsheet
Appendix D:	Printout of the WMPT Human Cancer Scores Spreadsheet
Appendix E:	Printout of the WMPT Ecological Toxicity Scores Spreadsheet
Appendix F:	Printout of the WMPT Human Health and Ecological Concern Scores Spreadsheet
Appendix G:	Printout of the WMPT Distribution-based Fencelines Spreadsheet
Appendix H:	Printout of the Spreadsheet Partitioning Model Input Data Spreadsheet
Appendix I:	Printout of the Spreadsheet Partitioning Model Calculation Spreadsheet, Formaldehyde Example
Appendix J:	TSCA 8(e) Triage Calls (Human Noncancer)
Appendix K:	SAT Calls (Human Noncancer)
Appendix L:	Environmental Toxicity Profiles for Existing Chemicals
Appendix M:	Documentation of Derivation of Secondary Chronic Values for the Sediment Quality Advisory Levels
Appendix N:	Improved Method for Estimating Bioconcentration Factor (BCF) From Octanol-Water Partition Coefficient.Third Update Report-August 1997. W. M. Meylan et al. Prepared by SRC for EPA.