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Ground-water flow in the Prairie du Chien-Jordan aquifer related to contamination by coal-tar derivatives, St Louis Park, Minnesota

Water-Resources Investigations Report 85-4087

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Abstract

A Three-dimensional, finite-difference, groundwater flow model of the Prairie du Chien-Jordan aquifer was developed to assess the movement of coal-tar derivatives from a coal-tar distillation and wood-preserving plant in St. Louis Park, Minnesota. The model was calibrated for steady-state and transient conditions. Sensitivity testing indicated that leakage to the upper model layer and the vertical hydraulic conductivity of the basal confining unit of the St. Peter were the most sensitive model hydrologic properties. Model simulations indicated that water introduced into the aquifer through wells open to several aquifers would raise the potentiometric surface of the Prairie du Chien-Jordan by as much as 3 ft in the area of the former plant. Other simulations suggested that withdrawal from certain upgradient wells may have altered local hydraulic gradients. These factors contributed to the potential for movement of contaminants from the area of the former plant to wells. Simulations of a proposed gradient-control plan indicate that the actions would be effective in limiting the expansion of the contaminated volume. These simulations also show, however, that control of discharge from all wells in the area will be important to the overall effectiveness of the plan. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Ground-water flow in the Prairie du Chien-Jordan aquifer related to contamination by coal-tar derivatives, St Louis Park, Minnesota
Series title:
Water-Resources Investigations Report
Series number:
85-4087
Edition:
-
Year Published:
1985
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
v, 57 p. :ill., maps ;28 cm.