Risk Assessment Methods for Establishing Clean Closure Levels

The methodology used for risk assessment during closure of a hazardous waste disposal facility in Florida, including hazard identification, exposure assessment, toxicity assessment, and risk characterization is described. The waste water from electroplating operations had been discharged through san...

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Bibliographic Details
Published in:Water science and technology 1991-01, Vol.24 (12), p.57-76
Main Authors: Riggenbach, J D, Streeter, R A, Hess, S C
Format: Article
Language:English
Subjects:
Chromium
Dredging
Ecological risk assessment
Environmental protection
Environmental regulations
Excavation
Groundwater
Hazard identification
Hazardous wastes
Heavy metals
Metals
Nickel
Removal
Risk assessment
Sludge
Soil
Soil water
Toxicity
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Description
Summary:The methodology used for risk assessment during closure of a hazardous waste disposal facility in Florida, including hazard identification, exposure assessment, toxicity assessment, and risk characterization is described. The waste water from electroplating operations had been discharged through sand filters to a surface impoundment, and legislation required that the chemical residues be removed from the filters and impoundment and that the soils remaining after closure of the facility should pose no risk to human health or the environment. The risk assessment process for soil clean-up levels is shown, and data are presented on chemicals used at the facility, concentrations of metals in soil samples before and after excavation, and concentrations of metals in groundwater. Potential exposure scenarios that could involve risk to humans, and specific parameters for calculating dosage and intake associated with various activities are described. The cleaned-up facility would not at present, or under possible future worst-case conditions, present a significant threat to human health or the environment.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1991.0370