Ecological Risk Assessment
SADA supports a EPA approaches to ecological risk assessment in a number of key areas. When SADA is installed,
it is accompanied by a substantial ecological benchmark database that can be used in
tabular and spatial point screenings, risk maps, dose maps, uncertainty modeling, and decision support in determining
the area of concerns or for locating new places for additional sampling. Ecological benchmarks found in the
database cover over 100 contaminants for surface water, sediment, and soil. In addition,
exposure modeling for 19 terrestrial species (birds and mammals) is available.
Users can modify the EPA default exposure parameters for the risk models where available. The following image shows
in red those places where SADA can support EPA's 8 step process for ecological risk.
The benchmark datagbase is in Microsoft Access and users may modify, delete, or add values as necessary
prior to using with SADA. SADA provides an import wizard that allows users to compare and match contaminants in their assessment with those found in the
benchmark database. All relevant information is then pulled from the database into the SADA file. Once the ecological risk
model has been setup, users continue to have complete control within SADA over particular parameter values. Users can view benchmark values,
browse histograms of values, and set physical parameters.
Viewing Benchmarks (table)
Viewing Benchmarks (histogram)
Setting Physical Parameters(table)
Callibrating Receptor Characteristics
Setting Contaminant Uptake Parameters
Ecological risk can directly contribute to geospatial modeling and decision processes. In the following images, we see
the translation of risk into a spatial context,
uncertainty, and decision support.
Benchmark Screens (boxes indicate exceedances; shown here arsenic against Dutch Intervention Benchmark)
Point Risk (ratio) (shown here arsenic with Dutch Intervention Benchmark)
Point Dose (shown here arsenic with short tailed shrew in soil)
Contoured Risk (shown here arsenic ratio map using Dutch Intervention Benchmark)
Contoured Dose (shown here arsenic dose map for short tailed shrew)
Probability Of Exceedance (shown here probability of arsenic exceeding Dutch Intervention Benchmark)
Decision Support (shown here an area of concern for arsenic using Dutch Intervention Benchmark; green areas indicate uncertainty in the boundary)
Supporting Sampling Designs
To see how risk is used in development of sampling designs see sample designs.
Additional ecological risk links are given below: