Revision History for SIR 2017-5070-C

Timothy T. Bartos, Steven K. Sando, Todd M. Preston, Gregory C. Delzer, Robert F. Lundgren, Rochelle A. Nustad, Rodney R. Caldwell, Zell E. Peterman, Bruce D. Smith, Kathleen M. Macek-Rowland, David A. Bender, Jill D. Frankforter, and Joel M. Galloway

Potential Effects of Energy Development on Environmental Resources of the Williston Basin in Montana, North Dakota, and South Dakota--Water Resources

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Posted online September 13, 2022

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Revised and reposted October 18, 2022, version 1.1

On p. 2, “ammonia” was changed to “ammonium.”

On p. 97, two sentences were revised from “The combined radium-226 and radium-228 activity levels in USGS samples ranged from 541 to 6,020 picocuries per liter (pCi/L), with a median of 3,280 pCi/L, which is about 656 times greater than the MCL (table 15). Ammonia concentrations in 2 samples ranged from 1,610 to 2,240 mg/L, with a median concentration of 2,080 mg/L, almost 10 times greater than the aquatic life ambient water quality acute toxicity criteria of the EPA (2013a; table 15).” To “The combined radium-226 and radium-228 activity levels in USGS samples ranged from 541 to 6,020 picocuries per liter (pCi/L), with a median of 3,695 pCi/L, which is about 739 times greater than the MCL (table 15). The total ammonia nitrogen (ammonia plus ammonium) aquatic life water quality criteria is 17 mg/L for acute toxicity and 1.9 mg/L for chronic toxicity at pH 7 and 20 degrees Celsius (EPA, 2013a). Ammonium concentrations in samples from two wells ranged from 1,610 to 2,240 mg/L (Boughton and others, 2022, table 4-2).”

In table 13, the median concentration value for potassium for the Bakken Formation USGS samples 2010-14 was changed from 84,000 to 83,100.

In table 15, the abbreviation “ALC” was removed from the headnote. The heading “number of samples” was changed to “number of wells.” The heading “number of samples that exceeded the regulation” was changed to “number of wells that exceeded the regulation.” One row with data for ammonia was removed. The median concentration value was revised for all constituents except arsenic and uranium. The unit for sulfate was changed from micrograms per liter to milligrams per liter. Footnote 1 was revised to include “Based on median values of samples from individual wells (Peterman and others, 2017; Boughton and others, 2022, table 4-2).” Footnote 2 was revised to remove an in-text citation for “EPA, 2013a” and to remove the following text: “The ALC is the highest concentration of a specific pollutant or parameter in water that is not expected to pose a substantial risk to most species in a given environment or a narrative description of the desired conditions of a water body being ‘free from’ certain negative conditions."

On p. 118, “ammonia” was changed to “ammonium.”