List of Figures

• Location of study area
• Physiographic setting, Hays, Kansas.
• Topographic surface, Hays vicinity, KS
• Cross-valley geologic sections, Hays, KS
• Location of additional wells used for stratigraphic information, Hays area.
• Surface contour of the top of the Cretaceous Shale (Kc)
• Water table contours
• Sand-gravel thickness, interpolated from well data
• Distribution of sand-gravel aquifer with thickness exceedung 5 ft
• Modflow model grid, Layer 1, Hays, KS
• Modflow model grid, Layer 2, Hays, KS
• Modflow model grid, Layer 3, Hays, KS
• Backward-tracked particle paths to well C-20
• Closeup view of C-20 particle paths and PCE plume
• 2-D capture zones for well C-20
• Map view of travel time from water table to well C-20
• Cross-sectional view of travel time from water table to well C-20
• Comparison of 2-D and 3-D 5- and 10-year capture zones at the water table
• Ten-year capture zones and particle paths, Hays city wells
• Five and Ten-year capture zones, Hays city wells
• Areas with unconfined Qal
• Total recharge to top of model
• Total vertical flux from Layer 3
• Borehole locations, modflow model area
• Borehole locations within Hays city limits