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Activity Number:
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343
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Type:
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Contributed
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Date/Time:
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Tuesday, July 31, 2007 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Statistics and the Environment
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| Abstract - #309711 |
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Title:
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Estimation of Exposure Point Concentrations for Probabilistic Risk Assessment Using a Three-Dimensional Estimation Technique
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Author(s):
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James Gleason*+ and Heidi Bowen-Morris
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Companies:
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Trihydro Corporation and Trihydro Corporation
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Address:
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1252 Commerce Drive, Laramie, WY, 82070,
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Keywords:
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Voronoi diagram ; Exposure Point Concentration
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Abstract:
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When estimating human health or ecological risks from exposure to contaminated subsurface soils, a main input is a representative Exposure Point Concentration (EPC). Typically, contaminant concentrations are measured at discrete depths and locations and the EPC is determined statistically. In probabilistic risk assessment, EPC determination is complicated by the observation that environmental data frequently do not follow a definable distribution and the intensity of exposure is a function of depth. Thus there is a need for a method of three-dimensional estimation that is not driven by parametric assumptions. The estimation method proposed builds on the work of Burmaster and Thompson (1996), creating a three-dimensional model using Extruded Voronoi diagrams. The method will be applied to residual lead concentrations at a hypothetical trap and skeet range.
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