Abstract
Groundwater chemistry was evaluated from 25 deep bores and 58 shallow piezometers. Groundwater in the fractured-bedrock aquifer is dominated by Mg and SO4 ions. Reactions within the colluvium include ion exchange of calcium for sodium in basal clays; dissolution of sodium chloride from dust-derived salt particles in the clay-rich colluvium; and microbiological reactions. Bivariate plots of sodium-versus-chloride and sodium-versus-calcium indicate that cation-exchange reactions occur in the colluvium. On the basis of hydrochemical modeling, it is concluded that the observed chemistry in the colluvial aquifer cannot be accounted for by evaporative concentration.
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