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(1) Discrete geochemical data for groundwater and surface water samples in the Umatilla River basin, 2014–2022 These data are chemical analyses of discrete samples of groundwater, stream base flow, and springs collected to support a U.S. Geological Survey study to estimate the timing and source of recharge to the basalt groundwater system in the Umatilla River basin, Oregon. Categories of data include: (1) site information (2) field measurements, (3) tracers of groundwater age and source, and (4) dissolved noble gases. These data were collected during August 26, 2014 – September 13, 2022. Data are in .csv file format. Categories: Data; Types: Data, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrology, Oregon, Umatilla, Water Resources, geochemistry, All tags... geoscientificInformation, groundwater geochemistry, isotope geochemistry, Fewer tags (2) Dissolved gas solubility calculations for groundwater samples collected in the Umatilla River basin, Oregon, 2014–2019 These data are solubility calculations for dissolved gases in groundwater samples collected to support a U.S. Geological Survey study to estimate the timing and source of recharge to the basalt groundwater system in the Umatilla River basin, Oregon. The software package Dissolved Gas Modeling and Environmental Tracer Analysis (DGEMTA; Jurgens and others, 2020) was used to develop the solubility calculations. DGMETA produces estimates of dissolved gas concentrations during recharge as well as estimates of recharge temperature, excess air, and excess nitrogen gas concentrations by optimizing the solutions of solubility equations for multiple gases dissolved in samples of groundwater. These data were collected during... Categories: Data; Types: Data, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrology, Oregon, Umatilla, Water Resources, dissolved gases, All tags... geochemistry, hydrogeology, water quality, Fewer tags Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022 This USGS data release presents data used to estimate and summarize where and when recharge occurs to the Columbia River Basalt Group (CRBG) in the Umatilla River basin, Oregon, 2014–2022. The supplemental data consist of two child items. The child items are: (1) Discrete geochemical data for groundwater and surface water samples in the Umatilla River basin, 2014–2022, and (2) Dissolved gas solubility calculations for groundwater samples collected in the Umatilla River basin, Oregon, 2014–2019 Types: Data, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geochemistry, Geochemistry, Ground-water and surface Water relations, Hydrology, Hydrology, All tags... Hydrology and Hydrogeology, Oregon, USGS Science Data Catalog (SDC), Umatilla, Water Resources, Water Resources, water resources, Fewer tags