Science & Technology

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

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.

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.

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 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 Comparing Background and Chemical Concentrations in Soil for CERCLA Sites

Guidance for Comparing Background and Chemical Concentrations in Soil for CERCLA Sites - EPA 540-R-01-003, OSWER 9285.7-41, September 2002

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

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

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.

Guidance for Data Useability in Risk Assessment (Part B-6), Final, May, 1992

This chapter discusses the application of radioanalytical data for risk assessment. Guidance is provided for reviewing data for consistency and completeness

Section 3 - Exposure assessment and risk descriptors

The results of a risk assessment are usually communicated to the risk manager in the risk characterization portion of the assessment.

EPA Science Matters Newsletter: Helping an Ally, and Learning from Disaster

EPA homeland security research helps Japan in the aftermath of the devastating earthquake, tsunami, and radiation leak.

EPA Science Matters Newsletter: MCnest: Not Just for the Birds (Published January 2014)

Learn about the Markov Chain Nest Productivity Model (MCnest), a model that estimates the potential impact of pesticide exposures on the reproductive success of bird populations.

Sourcing Urban Soil Contaminants to Improve Cleanup

A science matters story on Urban background contaminants

EPA Researchers Share Lessons Learned from Citizen Science Research Projects

FAQs about citizen science EHAs

Meet ORISE Research Fellow Nisha S. Sipes, Ph.D.

Nisha S. Sipes is an ORISE Research Fellow in EPA’s innovative National Center for Computational Toxicology. She and her colleagues are changing the way toxicity testing is done by researching ways to make it faster, more efficient, and more informative