Recharge Sources and Residence Times of Groundwater Determined by Geochemical Tracers in the Mayfield Area, Southwestern Idaho, 2011-12.

摘要

Parties proposing residential development in the area of Mayfield, Idaho are seeking a sustainable groundwater supply. During 2011-12, the U.S. Geological Survey, in cooperation with the Idaho Department of Water Resources, used geochemical tracers in the Mayfield area to evaluate sources of aquifer recharge and differences in groundwater residence time. Fourteen groundwater wells and one surface-water site were sampled for major ion chemistry, metals, stable isotopes, and age tracers; data collected from this study were used to evaluate the sources of groundwater recharge and groundwater residence times in the area. Major ion chemistry varied along a flow path between deeper wells, suggesting an upgradient source of dilute water, and a downgradient source of more concentrated water with the geochemical signature of the Idaho Batholith.