EnviroGulf Consulting

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INDEPENDENT ENVIRONMENTAL CONSULTANCY

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ENVIRONMENTAL RISK ASSESSMENT

Environmental Risk Assessment

Risk assessment and risk management are being applied more and more routinely by government and industry to evaluate the impact of potentially hazardous substances and situations. EnviroGulf Consulting undertakes environmental risk assessments as part of a multidisciplinary team and, or, solely in the execution of ecological risk assessments.

Risk management serves to prioritise the risks to which a system is exposed, so that practices and policies can be put into place, such that:

The most direct procedure for evaluating environmental risk attendant to contaminants in recipient waters is a field study in which the aquatic ecosystem is monitored for damage, causal factors delineated, and the results extrapolated or generalised.

By way of thorough biological assessments, environmental impact analysis, toxicity evaluations and physicochemical analyses, EnviroGulf Consulting offers technically sound solutions to complex environmental issues.

Consulting Services

EnviroGulf Consulting provides risk assessments tailored to our clients' specific area of interest following assessment techniques approved by regulatory authorities to which their reports are submitted. This procedure ensures the greatest chance of receiving a favourable review.

The following services are available:

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Preliminary Risk Assessment

A review of background information and data coupled with an initial site inspection and perhaps limited sampling form part of a preliminary risk assessment that EnviroGulf Consulting undertakes on behalf of clients. The objective is either to terminate an investigation because no risk is shown or to confirm contamination and firm up subsequent site investigations to identify exposure pathways and target populations.

Risk Assessment

Risk is a measure of the probability that an adverse effect will occur. In the case of a chemical contaminant, it is a function of the intrinsic capacity of the contaminant to cause an adverse effect and the concentration (or dose).

Hazard Identification

Hazard identification as part of the risk assessment process defines the toxicological hazards posed by chemical contaminants. These hazards are summarised in a toxicity profile for each contaminant of concern.

Dose-Response Assessment

Toxicity databases are accessed by computer to determine the relationships between observed doses or concentrations of contaminants and specified biological responses. The scientific literature is also critically appraised.

Exposure Assessment

Exposure assessment as part of risk evaluation implies the need to estimate frequency of exposure. The assessment evaluates the nature and magnitude of potential exposures of receptor populations to contamination via various environmental media. Site-specific exposure scenarios are generated and environmental concentrations are presented.

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Risk Characterisation

Risk characterisation estimates the impact of these exposures on environmental and human health.

The best estimate of potential risk as well as the highest plausible risk are presented. The weight of evidence approach is used to identify the most defensible value.

Uncertainty Analysis

Sensitivity and uncertainty analyses are performed to quantify the uncertainty of risk assessments made. The techniques used include quantification of the effects of changing individual assumptions on the results and probability analyses.

Ecological Risk Assessment

Ecological risk assessment methodology is based on ecotoxicological approach consisting of the following components:

Time-varying contaminant concentrations are statistically analysed and their frequency and duration in receiving waters determined. Risk is then assessed by multiplying the probability of an event by the event's consequential effects. Due to the nature of toxicological tests (LC50s, etc.), the consequential effects are presently limited to the direct effects of dissolved contaminant species.

This simplified approach allows comparison of various contaminants and determines whether concentrations exceed known toxic thresholds. EnviroGulf Consulting recognises the limitations of toxicity test data and therefore evaluates the results in light of such factors as the presence of other water quality parameters, life phase, food web, bioconcentration, bioaccumulation and biomagnification.

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Relevant Experience

The following are example projects that contain environmental or ecological risk assessments carried out by EnviroGulf Consulting:

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