Maps of Estimated Nitrate and Arsenic Concentrations for Basin-Fill Aquifers of the Southwestern United States.

摘要

This report summarizes statistical models developed by Anning and others (2012) that relate concentrations of nitrate and arsenic in basin-fill aquifers of the SWPA study area to selected natural and human-related factors representing contaminant sources and aquifer susceptibility conditions. Statistical models allow the understanding of nitrate and arsenic concentrations to be expanded from discrete observations to broader spatial predictions. Specifically, this report presents the spatial and statistical distribution of nitrate (plate 1) and arsenic (plate 2) concentrations in basin-fill aquifers across the SWPA study area as determined by using predictions from statistical models.