Science & Technology

Human Health Toxicity Values in Superfund Risk Assessments

This memorandum revises the hierarchy of human health toxicity values generally recommended for use in risk assessments, originally presented in Risk Assessment Guidance for Superfund Volume I, Part A.

Role of the Ecological Risk Assessment in the Baseline Risk Assessment

I want to emphasize the importance of selecting remedies at Superfund sites that are protective of the environment as well as human health.

Ecotox Thresholds 1996

This bulletin provides an overview of the development and use of Ecotox Threshold (ET) benchmark values in Superfund ecological risk assessments (ERAs)

Guidance for Data Useability in Risk Assessment (Part A-7), Final, April, 1992

This chapter provides guidance for integrating the assessment of data useability to determine the overall level of uncertainty of risk assessment.

Ecological Assessment of Superfund Sites: An Overview

ECO Updates are a series of intermittent bulletins intended to facilitate ecological assessment of Superfund sites.

Selecting and Using Reference Information in Superfund Ecological Risk Assessments

Reference information, as used in this Bulletin, is data of a comparative nature needed by investigators to evaluate the environmental condition of a Superfund site.

Transmittal of Interim Bulletin Volume 1, Number 1 "Supplemental Guidance to RAGS: Calculating the Concentration Term", June 22, 1992

A quality action team (QAT) was initiated at the annual Superfund Risk Assessment Meeting in March, 1991, specifically to address the problem of calculating the concentration term for use in Superfund exposure assessment.

Transmittal of Policy Statement: "Role of Background in the CERCLA cleanup program"

Draft versions of this policy were distributed for internal review and comment in January 2001 and August 2001.

OSWER Directive 9200.1-120

Update of Standard Default Exposure Factors issued by EPA's Office of Solid Waste and Emergency Response, know referred to as the Office of Land and Emergency Management (OLEM).

Example Calculations of Preliminary Remediation Goals for Benzo[a]pyrene Using Age-Dependent Adjustment Factors, Draft

Example preliminary remediation goal (PRG) calculations for exposure to benzo[a]pyrene in soil and water by ingestion using age-dependent adjustment factors (ADAFs)

Example RAGS D Tables for Chemicals with a Mutagenic Mode of Action for Carcinogenicity (Revision 2.0, December 2007)

Example RAGS D tables for chemicals with a mutagenic mode of action for carcinogenicity

Catalogue of Standard Toxicity Tests for Ecological Risk Assessment

The aquatic toxicity tests described here are the most commonly used tests and are highly standardized.

Ecological Significance and Selection of Candidate Assessment Endpoints

This bulletin provides guidance to Superfund risk assessors and risk managers on planning ecological risk assessments (ERAs) at Superfund sites.

Non-Dioxin-Like PCBs: Effects and Consideration In Ecological Risk Assessment

An estimated one million metric tons of commercial mixtures of polychlorinated biphenyls (PCBs), such as Aroclors (USA), Kanechlors (Japan) and Clophens (Germany), were manufactured (WHO, 1993) and used worldwide as dielectric fluids

Memorandum: Tier 3 Toxicity Value White Paper - June 19, 2013

The purpose of this memorandum is to transmit the OSRTI Document entitled "Tier 3 Toxicity Value White Paper

Region and ORD Workshop on Inhalation Risk Assessment A Superfund focus

Each year, EPA Regions identify high priority science topics on which to conduct workshops. The workshops address the science issues of greatest interest to the regions on the selected topic areas.

Ecotox Thresholds

The ecological risk assessments (ERAs) performed in the superfund program often include a procedure to determine which, if any, of the contaminants found at a site are present

Tier 3 Toxicity Value White Paper

The purpose of this white paper is to articulate the issues pertaining to Tier 3 toxicity values and provide recommendations on processes that will improve the transparency and consistency of identifying, evaluating, selecting, and documenting Tier 3 toxicity values for use in the Superfund and Resource Conservation and Recovery Act (RCRA) programs. This white paper will be used to assist regional risk assessors in selecting Tier 3 toxicity values as well as provide the foundation for future regional and national efforts to improve guidance and policy on Tier 3 toxicity values.

Example Calculations of Preliminary Remediation Goals (PRGs) for Benzidene Across Multiple Exposure Pathways Using Age-Dependent Adjustment Factors, Draft (Revision 1.0, December 2007)

Example preliminary remediation goal (PRG) calculations for exposure to benzidene in soil and water by both the ingestion and dermal exposure pathways using age-dependent adjustment factors (ADAFs)

Field Studies for Ecological Risk Assessment

Ecological risk assessments of Superfund sites evaluate the actual or potential effects of site contaminants on plants and animals and assess the need for remediation