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Review of Case Materials
Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.
Provide Expert Analysis
Applies specialized knowledge and experience to evaluate the technical or professional issues involved.
Form Expert Opinions
Develops independent, supportable opinions based on the available evidence and relevant standards.
Prepare Expert Reports
Prepares clear, well-supported expert reports outlining methodology, analysis, findings, and opinions.
Provide Deposition Testimony
Explains findings and opinions under oath and responds to questioning during deposition testimony.
Testify in Court
Presents specialized findings and opinions clearly to judges, juries, arbitrators, or other decision-makers.
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A suitably qualified aquatics expert can integrate biological, chemical, physical, habitat, and toxicity information rather than relying on a single measurement. Relevant evidence may include fish or invertebrate surveys, algae, nutrients, dissolved oxygen, temperature, pH, contaminants, sediment conditions, habitat observations, and historical monitoring. EPA identifies biological integrity, chemical, physical, habitat, and toxicity data as major categories used in water-quality assessments and specifically uses aquatic organisms to evaluate ecosystem condition.
The expert may review nutrient concentrations, chlorophyll or algal measurements, phytoplankton observations, dissolved oxygen, water clarity, temperature, photographs, sampling histories, and the timing and extent of blooms. Excess nitrogen or phosphorus can stimulate algal growth, while decomposition of algae can consume dissolved oxygen and contribute to hypoxic conditions. Some blooms produce toxins, but other blooms can cause ecological effects without toxin production.
Depending on qualifications, the expert may review contaminant concentrations, sampling methods, exposure media, species tested, laboratory toxicity results, field observations, and the timing of biological effects. EPA aquatic toxicity testing may examine survival, growth, reproduction, behavior, and other endpoints in organisms exposed in water or sediment, depending on the test. EPA also distinguishes acute and chronic aquatic-life effects when developing water-quality criteria. Where the principal question requires specialized dose-response analysis, toxicological mechanism, or formal ecotoxicological causation, specialized toxicology, ecotoxicology, or another appropriately qualified specialty may be required.
Useful materials may include original laboratory reports, water and sediment sampling results, sampling locations and methods, chain-of-custody documentation, biological surveys, fish or invertebrate data, algae and phytoplankton results, nutrient measurements, dissolved-oxygen and temperature logs, photographs and video, site maps, discharge or treatment records, weather information, historical monitoring, and contemporaneous communications. Preserving the sampling methodology and chronology is particularly important when parties disagree about whether measurements represent conditions at the relevant place and time.
