Determination of representative uranium and selenium concentrations from groundwater, 2016, Homestake Mining Company Superfund site, Milan, New Mexico

Open-File Report 2018-1055
Prepared in cooperation with the U.S. Environmental Protection Agency
By:

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Abstract

In 2016, the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, collected data on isotopes, age dating, and geochemistry including aqueous uranium concentrations of samples from 20 locations in the vicinity of the Homestake Mining Company Superfund site near Milan, New Mexico. The 20 sampled locations include 19 groundwater wells and 1 treatment plant for water used for injection into aquifers. At 6 of the 19 wells, multiple samples were collected by several different sampling methods, including passive, micropurge, and volumetric methods.

Aqueous uranium concentrations were adjusted on the basis of comparisons between three sampling methods (called sample adjustments). These adjustments were specific to passive sample results because they underestimated uranium concentrations compared with results from purge samples (micropurge and volumetric). Sample adjustments were also made on aqueous selenium concentrations from previously published data for passive sampler results following a similar procedure.

Aqueous uranium concentrations in dissolved and total form were adjusted from the original analytical values (called laboratory analytical adjustments) on the basis of a rigorous comparison to several external tests, including reruns and analysis by a different laboratory after accuracy issues were identified in data from the original laboratory. The original laboratory analytical results were found to be two to five times greater than historical concentrations at the same locations, which prompted further evaluation, as described in this report.

Suggested Citation

Harte, P.T., Blake, J.M., and Becher, K.D., 2018, Determination of representative uranium and selenium concentrations from groundwater, 2016, Homestake Mining Company Superfund site, Milan, New Mexico: U.S. Geological Survey Open-File Report 2018–1055, 40 p., appendixes, https://doi.org/10.3133/ofr20181055.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Acknowledgments
  • Abstract
  • Introduction
  • Methods of Groundwater Sampling, Laboratory Analysis, and Data Evaluation
  • Results of Comparison
  • Converted Concentrations
  • Summary
  • References Cited
  • Appendix 1. Depths and Methods of Sampling at the Homestake Mining Company Superfund Site Near Milan, New Mexico
  • Appendix 2. Uranium Concentrations Near the Homestake Mining Company Superfund Site Near Milan, New Mexico
  • Appendix 3. Uranium Concentrations From a Rerun Analysis by RTI Laboratories, Inc. for the Homestake Mining Company Superfund Site Near Milan, New Mexico

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Determination of representative uranium and selenium concentrations from groundwater, 2016, Homestake Mining Company Superfund site, Milan, New Mexico
Series title Open-File Report
Series number 2018-1055
DOI 10.3133/ofr20181055
Year Published 2018
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) New England Water Science Center
Description Report: vii, 37 p.; Appendix; Data release
Country United States
State New Mexico
City Milan
Other Geospatial Homestake Mining Company Superfund Site
Online Only (Y/N) Y
Additional Online Files (Y/N) Y