Data and Tools

Getting Started

This page provides a guide overview to the step-by-step guide to Stressor Identification, and fundamentals of causal assessment.

Step 5. Identify Probable Causes

This page includes an overview of Step 5, to identify probable cause, then weighing evidence for a candidate cause, comparing evidence across causes, and analyzing the expected output of the causal assessment.

The Case of DDT: Revisiting the Impairment

This page is an example or case study showing how the identification of DDT and it's subsequent ban had a positive impact on the reproduction of birds. This is an excellent example of causal analysis with a positive outcome.

Spatial/Temporal Co-occurrence

This page shows how to derive and evaluate evidence of spatial/temporal co-occurrence.

Laboratory Tests of Site Media

This page show how to derive and evaluate evidence from laboratory tests of site media.

Step 4. Evaluate Data from Elsewhere

This page includes an overview, details and expected output from Step 4: Evaluate Data from Elsewhere.

Stressor-Response Relationships from the Field

This page shows how to derive and evaluate evidence of stressor-response relationships from the field.

Evidence of Exposure or Biological Mechanism

This page shows how to derive and evaluate evidence of exposure or biological mechanism.

Verified Predictions

This page shows how to derive and evaluate evidence of a verified prediction.

Step 2. List Candidate Causes

This page includes an overview, including more details and expected output of Step 2, listing candidate causes of a causal impairment.

Iteration Options

This page provides additional information on the iterative options to consider when you are trying to identify the cause of an impairment. This is supporting step 5 of a causal assessment.

Manipulation of Exposure

This page shows how to derive and evaluate evidence from studies that manipulate exposure.

Temporal Sequence

This page shows how to derive and evaluate evidence of a temporal sequence.

Example Stressor-Response Relationships Table

Example Stressor-Response Relationships Table as part of CADDIS Volume 1 stressor identification section.

Long Creek Conceptual Model Diagram

Figure 2-2 is an example of a simple conceptual model diagram for increased water temperature as a candidate cause of biological impairment.

Stressor-Response Relationships from Other Field Studies

This page shows how to derive and evaluate evidence using stressor-response relationships from other field studies.

Figures: Manipulation of Exposure at Other Sites

These figures illustrate the concept of the type of evidence "Manipulation of Exposure at Other Sites"

Visual Plumes

Page on Visual Plumes model system, a Windows-based software application for simulating surface water jets and plumes.

AVERT Questions and Answers

Frequently asked questions about EPA's AVERT model.

Results of Aerial Surveys of Gamma Radiation around Ambrosia Lake

A map of the Non-Tribal Tronox Sites and Areas with ASPECT Exposure Rate >= 25 microR/hr.