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Data Series 718

In cooperation with the Wyoming Department of Environmental Quality

Groundwater-Quality and Quality-Control Data for Two Monitoring Wells near Pavillion, Wyoming, April and May 2012

By Peter R. Wright, Peter B. McMahon, David K. Mueller, and Melanie L. Clark

Thumbnail of and link to report PDF (3 MB)Abstract

In June 2010, the U.S. Environmental Protection Agency installed two deep monitoring wells (MW01 and MW02) near Pavillion, Wyoming, to study groundwater quality. During April and May 2012, the U.S Geological Survey, in cooperation with the Wyoming Department of Environmental Quality, collected groundwater-quality data and quality-control data from monitoring well MW01 and, following well redevelopment, quality-control data for monitoring well MW02. Two groundwater-quality samples were collected from well MW01—one sample was collected after purging about 1.5 borehole volumes, and a second sample was collected after purging 3 borehole volumes. Both samples were collected and processed using methods designed to minimize atmospheric contamination or changes to water chemistry. Groundwater-quality samples were analyzed for field water-quality properties (water temperature, pH, specific conductance, dissolved oxygen, oxidation potential); inorganic constituents including naturally occurring radioactive compounds (radon, radium-226 and radium-228); organic constituents; dissolved gasses; stable isotopes of methane, water, and dissolved inorganic carbon; and environmental tracers (carbon-14, chlorofluorocarbons, sulfur hexafluoride, tritium, helium, neon, argon, krypton, xenon, and the ratio of helium-3 to helium-4). Quality-control sample results associated with well MW01 were evaluated to determine the extent to which environmental sample analytical results were affected by bias and to evaluate the variability inherent to sample collection and laboratory analyses. Field documentation, environmental data, and quality-control data for activities that occurred at the two monitoring wells during April and May 2012 are presented.

Revised October 29, 2012

First posted September 26, 2012

For additional information contact:
Director, Wyoming Water Science Center
U.S. Geological Survey
521 Progress Circle, Suite 6
Cheyenne, WY 82007
http://wy.water.usgs.gov/

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Suggested citation:

Wright, P.R., McMahon, P.B., Mueller, D.K., Clark, M.L., 2012, Groundwater-quality and quality-control data for two monitoring wells near Pavillion, Wyoming, April and May 2012: U.S. Geological Survey Data Series 718, 23 p. (Revised October 2012)



Contents

Abstract

Introduction

Methods

Groundwater-Quality Data

References Cited

Appendix 1. Monitoring Well MW01 field notes—Field instrument calibration notes, general project notes, groundwater-quality notes for samples 1 and 2, alkalinity/acid neutralizing capacity titration field notes and results (figures 1.1.1–1.3.2)

Appendix 2. Monitoring Well MW01 laboratory-related documents—Analytical Services Request forms, Chain of Custody records (figures 2.1.1–2.10.2

Appendix 3. Monitoring Well MW01 photographs (figures 3.1–3.1.6)

Appendix 4. Monitoring Well MW02 field notes—Groundwater-quality and field notes for collection of samples related to work at this well (figures 4.1–4.2)

Appendix 5. Monitoring Well MW02 laboratory-related documents—Analytical Services Request forms, Chain of Custody records (figures 5.1.1–5.2.4)

Appendix 6. Monitoring Well MW02 photographs (figures 6.1–6.6).

Appendix 7. Tentatively identified compounds quantified in environmental and quality-control samples collected for monitoring well MW01 near Pavillion, Wyoming


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