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Trace Levels of Organic Chemicals Limited to Local Reaches of a Stream near an Oil and Gas Wastewater Disposal Facility

USGS scientist measuring dissolved oxygen
U.S. Geological Survey (USGS) scientist measuring dissolved oxygen in a stream water sample. The scientist is part of a USGS team of scientists that are investigating the potential environmental effects of activities at an oil and gas wastewater injection facility in West Virginia. Scientists have found evidence indicating the presence of wastewaters in surface waters and surficial sediments near the facility. Photo Credit: Denise M. Akob, USGS.

Organic contaminants that were present in Wolf Creek near a wastewater disposal facility were not evident farther downstream where Wolf Creek enters the New River. Wolf Creek and the New River are used for drinking water and recreational purposes.

The disposal of large volumes of wastewater is an issue facing the unconventional oil and gas (UOG) production industry. Significant progress has been made in recycling water used in hydraulic fracturing and reducing the amount of wastewater generated.  Most of the remaining wastewater is disposed of by deep underground injection because the wastewater is unsuitable for disposal in standard wastewater treatment plants. The risks due to leaks, spills, and migration of these fluids into natural waters are unknown.

Previous U.S. Geological Survey (USGS) studies determined the presence of inorganic contaminants related to UOG production in a small intermittent tributary to Wolf Creek that runs through a wastewater injection and disposal facility in West Virginia. In this current study, the organic chemical composition (nonpurgeable dissolved organic carbon, extractable hydrocarbons, C1–C6 hydrocarbons, biocides, and disinfection byproducts) and cell line toxicity were assessed in stream water and sediment samples collected upstream from, within, and downstream from the disposal facility, and at a background site in a separate drainage basin.

Class II injection well wastewater disposal facility with sorage tanks and tanker trucks
This West Virginia disposal facility disposes of wastewaters from unconventional oil and gas production in Class II underground injection control wells. Photo Credit: Kalla Leigh Fleger, USGS

This current study supports the previous work done by the USGS and shows that organic substances consistent with a source from wastewater originating from UOG production were observed in stream water and sediments at sites immediately downstream from the facility.  Concentrations of organics were low and included compounds like 2-(2-butoxyethoxy)-ethanol; tris(1-chloro-2-propyl)phosphate; α, α-dimethyl-benzenemethanol; 3-ethyl-4-methyl-1H-pyrrole-2,5-dione; and tetrahydro-thiophene-1,1-dioxide, which are all present in wastewater from UOG production. Toxicological assays of human cell line exposures to water and sediment from the creek showed minimal effects. Low-level organic contamination seems to be limited to the part of the creek immediately downstream from the facility. Organic contaminants were not evident farther downstream on Wolf Creek to the point where the tributary waters enter the New River, which are both used for drinking water and recreational purposes.

A view of the New River from the New River Gorge Bridge, West Virgina
A view of the New River from the New River Gorge Bridge, West Virgina. Wolf Creek is a tributary of the New River. Photo: Denise M. Akob, USGS.

The USGS Toxic Substances Hydrology Program and the USGS Energy Resources Program funded this study.

Reference

Orem, W., Varonka, M., Crosby, L., Haase, K., Loftin, K., Hladik, M., Akob, D.M., Tatu, C., Mumford, A., Jaeschke, J., Bates, A., Schell, T., and Cozzarelli, I.M., 2017, Organic geochemistry and toxicology of a stream impacted by unconventional oil and gas wastewater disposal operations: Applied Geochemistry, v. 80, p. 155-167, doi:10.1016/j.apgeochem.2017.02.016.

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