Dr. Paradis gave a YouTube livestream webinar titled, Tracking Salt: From Winter Roads to Summer Streams, as part of this year’s Wisconsin Salt Awareness Week. This research is based on Leah Dechant’s master’s thesis that is focused on quantifying the mass discharge of chloride from groundwater to the Root River in Racine, Wisconsin during the summer/non-road salting months.
A new research article titled, Single-Well Push–Pull Tracer Test Analyses to Determine Aquifer Reactive Transport Parameters at a Former Uranium Mill Site (Grand Junction, Colorado), was recently published in the scientific journal Minerals. This research used PHREEQC (geochemistry), PHT-USG (flow and transport), and PEST (calibration) to understand the importance of cation exchange, sorption, and gypsum dissolution on the fate and transport of uranium at a former mill tailings site.
Figure 9. Model fit for uranium in all PPT wells, with and without gypsum addition for wells 0120 and 0121. Phases are: (1) traced river water injection, (2) untraced river water injection (chase), (3) drift phase, and (4) pumping phase. Posted values are the GC_s uranium sorption parameter values (moles/kg-water) for the upper and lower sensitivity testing (gray dashed curve) and the calibrated value from Table 4 (solid blue curve). GC_s values in bold italics indicate the authors’ picks for the best final values.