File characteristics: Database (20 files). Physical description: 1 computer diskette; 5 1/4 in.; high density; 1.4MB. System requirements: PC compatible; DOS; DBase III+; (31) Files are compressed. To access the list requires a hard disk with at least 10MB of free space. This Appendix lists the chemicals for which information is available in the database collection systems described in Part I of this inventory. For each chemical, the list indicates which database(s) contain information and for what media. The media categories are air, water, soil, food, bulk chemicals, human samples, mixed hazardous waste, materials injected into underground wells, materials discharged to Publicly Owned Treatment Works (POTWs), wastes at recycling and treatment facilities, and wildlife that does not constitute a food source for humans (e.g. starlings).

Assessment of human exposure to chemicals is a critical input to risk assessment and ultimately to decisions about control of chemicals. This two-part publication aims to improve the quality of information available to decision-makers and its communication. Part one sets out ten principles for characterizing and communicating uncertainty in exposure assessment. A tiered approach to the evaluation of uncertainties using both qualitative (simple) and quantitative (more complex) methods is described. Different sources of uncertainty are identified and guidance is provided on selecting the appropriate approach to uncertainty analysis as dictated by the objectives of the assessment and information needs of decision-makers and stakeholders. Part two addresses the quality of data used in exposure assessment and sets out four basic hallmarks of data quality - appropriateness accuracy integrity and transparency. These hallmarks provides a common vocabulary and set of qualitative criteria for use in the design evaluation and use of exposure assessments to support decisions. This publication is intended exposure assessors risk assessors and decision-makers.