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 Table 4 (Continued)
Uncertainty Source
Preliminary Ranking
Tier IV: Human Health and Ecological Risk Assessments Problem Formulation/Hazard Identification
Characterization of Dredged Material - see Tier I
Development of Conceptual Model
Characterization of the surrounding environment
NR
PS
Identification of complete and incomplete pathways
Selection of potential receptors
PS
Assessment and Measurement End Points
NR
Selecting assessment end points
Selecting measurement end points
PS
Exposure Assessment
Estimation of Exposure Point Concentrations
Fate and transport models: model uncertainty
MS
Fate and transport models: parameter uncertainty
2
Physical and chemical properties of COCs (Kow, Koc, Kdoc)
Physical and chemical properties of COCs (vapor pressure, molecular weight, solubility)
1
Bioaccumulation of COCs
2
Bioavailability from sediments for ecological receptors
Bioavailability from water for ecological receptors
2
1
Exposure models for aquatic organisms: equilibrium models
NR
Use of equilibrium models when time-variant models are more appropriate
Parameter uncertainty (uptake, elimination, and growth rates, etc.)
2
NR
Exposure models for semiaquatic organisms and humans: model uncertainty
2
Exposure models for semiaquatic organisms and humans: parameter uncertainty
Physiological characteristics (e.g., body weight, inhalation rate, etc.)
1
2
Exposure duration (migration, foraging area, feeding patterns)
1
Time-activity patterns for workers involved in dredging and disposal activities
(Sheet 2 of 3)
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