North Dakota Wrestles with Radioactive Oilfield Waste (Sarah Jane KELLER, High Country News; July 14, 2014)
http://www.hcn.org/articles/north-dakota-wrestles-with-radioactive-oilfield-waste
Articles:
Analysis of Reserve Pit Sludge from Unconventional Natural Gas Hydraulic Fracturing and Drilling Operations for the Presence of Technologically Enhanced Naturally Occurring Radioactive Material (TENORM)
[RICH and CROSBY, 2013]
http://baywood.metapress.com/media/bavktmrtlp36d4v5pn5u/contributions/k/6/2/1/k621376330557386.pdf
Impacts on Shale Gas Wastewater Disposal on Water Quality in Western Pennsylvania (WARNER et al., 2013)
http://biology.duke.edu/jackson/est2013.pdf