MODELING GEOCHEMICAL PARAMETERS IN THE ST. FRANCOIS AQUIFER USING WELL DATA FROM SPRINGFIELD, MISSOURI

Geochemical modeling will be used to help define the potential dissolution/precipitation of solid phases as a result of varying pH levels, pressure, temperature, and porosity. The unit under consideration is the Lamotte Sandstone, a 200 ft thick heterogeneous sandstone. Beneath Springfield, Missouri, the Lamotte Sandstone is a water-bearing unit that is a member of the St. Francois aquifer. The overlying Ozark aquifer supplies water to the Springfield area. Although the St. Francois Aquifer is not regarded as a potential source of water, modeling the geochemical properties of the St. Francois Aquifer will help in better understanding the geochemical interactions within this unit. MINTEQ geochemical model will be utilized in the analysis. Water chemistry input values obtained from a deep well in the area will be complemented with water chemistry reported from nearby wells.