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Water Quality data compiled for Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California

Dates

Publication Date
Start Date
1980-01-01
End Date
2019-12-18

Citation

Haugen, E.A., and Arroyo-Lopez, J.A., 2021, Water Quality data compiled for Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California: U.S. Geological Survey data release, https://doi.org/10.5066/P9OZ50BM.

Summary

Groundwater arsenic concentrations in the San Joaquin Valley have varied over the decades from 1980 to 2019. This report was compiled to determine whether arsenic concentrations are increasing or decreasing and the mechanism controlling the trends. The San Joaquin Valley contains 4,979 wells with arsenic analyses and possible co-detections of any of the following constituents: dissolved oxygen, field-measured pH, iron, manganese, sulfate, nitrate, or water level. Water quality data comes from two sources: 3,302 wells from with California State Water Resources Control Board - Division of Drinking Water and 1,448 wells from the U.S. Geological Survey National Water Information System (California State Water Resources Control Board – [...]

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SJV_As_QW.xlsx 10.89 MB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
SJV_site_file.xlsx 453.6 KB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Purpose

Water quality data were compiled for the San Joaquin Valley study area to assess arsenic concentration trends and determine the likely mechanisms responsible for arsenic behavior in the SJV. Three non-parametric statistical approaches were employed using this dataset with a significance level (α) of 0.1: the Wilcoxon rank sum test used to determine a significant difference between populations, the Wilcoxon signed rank test for paired samples used to determine a significant difference between the same population with analyses in 2000-2009 and 2010-2019, and the Mann-Kendall test used to identify significant monotonic trends from individual wells. Trends results were then evaluated based on region, well depth, lateral position, and location in relation to subsidence areas, as well as correlation with other constituent trends.

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  • USGS California Water Science Center
  • USGS Data Release Products

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9OZ50BM

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