Ground-water quality data from the northern Mississippi embayment; Arkansas, Missouri, Kentucky, Tennessee, and Mississippi

Groundwater quality data were collected from 42 selected wells in the McNairy-Nacatoch-Ripley and the lower Wilcox aquifers of the northern Mississippi embayment. The study is part of the Gulf Coast Regional Aquifer System Analysis (GC RASA) study; the data will be used for geochemical modeling of mineral saturation and mass transfer in the McNairy-Nacatoch-Ripley aquifer. The report contains two figures showing the location of sampling sites for each of the two aquifers, six tables of data which contain (1) well descriptions and (2) concentrations of major constituents, trace constituents, dissolved gases, stable and unstable isotopes of low mass (C, H, O, and S), and unstable isotopes of high mass (Rn, Ra, and U), and a brief documentation of the methods used for sample collection and analysis. (USGS)