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Title: The effect of a zero-concentration sink on contaminant transport and remedial-action designs for the Weldon Spring quarry, Weldon Spring, Missouri

One-dimensional analytical expressions are developed to simulate two processes in a homogeneous porous medium: contaminant transport through a porous medium that has a zero-concentration sink located at a finite distance from a step-function source; and contaminant transport through a porous medium that has an initial steady-state distribution corresponding to a constant strength source and zero-concentration sink separated by a finite distance. The governing equations are cast in dimensionless form, making use of the flow system's Peclet number. Evaluation of the analytical expressions is accomplished by numerical inversion of Laplace-space concentrations using either a full Fourier series approach with acceleration, or the Stehfest algorithm. The analytical expressions are used to evaluate possible contaminant conditions at the Weldon Spring quarry near Weldon Spring, Missouri. The following results have been found: contaminant concentrations should be at or near steady-state conditions; the spatial distribution of contaminants should be a function of the flow system's Peclet number; contaminant concentrations near the Femme Osage Slough should approach zero; contaminant concentrations near the quarry during dewatering and bulk-waste removal should monotonically decrease with time; and the spatial distribution of contaminants during remedial activities should be relatively flat, especially near the dewatering pumps. Future work will entail evaluatingmore » existing radionuclide or chemical concentration data to determine the applicability of the proposed contaminant transport model and to improve the hydrogeological conceptualization of the quarry area and vicinity. 20 refs., 27 figs.« less
Authors:
Publication Date:
OSTI Identifier:
6461572
Report Number(s):
ANL/EAIS/TM-31
ON: DE91002957
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Technical Report
Research Org:
Argonne National Lab., IL (USA). Environmental Assessment and Information Sciences Div.
Sponsoring Org:
DOE/NE
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 54 ENVIRONMENTAL SCIENCES; ENVIRONMENTAL TRANSPORT; MATHEMATICAL MODELS; POLLUTANTS; ECOLOGICAL CONCENTRATION; ONE-DIMENSIONAL CALCULATIONS; RADIOACTIVE MATERIALS; RADIOECOLOGICAL CONCENTRATION; SURPLUS NUCLEAR FACILITIES; REMEDIAL ACTION; CHEMICAL WASTES; CONTAMINATION; GROUND WATER; HYDROLOGY; LAPLACE TRANSFORMATION; MISSOURI; POROUS MATERIALS; RADIOACTIVE WASTES; RADIONUCLIDE MIGRATION; SOLUTES; SOURCE TERMS; SURFACE WATERS; WASTE MANAGEMENT; FEDERAL REGION VII; HYDROGEN COMPOUNDS; INTEGRAL TRANSFORMATIONS; MANAGEMENT; MASS TRANSFER; MATERIALS; NORTH AMERICA; NUCLEAR FACILITIES; OXYGEN COMPOUNDS; TRANSFORMATIONS; USA; WASTES; WATER 054000* -- Nuclear Fuels-- Health & Safety; 540320 -- Environment, Aquatic-- Chemicals Monitoring & Transport-- (1990-); 540330 -- Environment, Aquatic-- Radioactive Materials Monitoring & Transport-- (1990-)