Federal regulators have fined Halliburton Energy Services, Inc. $7,000 for safety violations in a deadly 2014 explosion at a hydraulic fracturing site in Weld County. Denver ABC7 TV, Colorado. 27 May 2015. http://www.thedenverchannel.com/news/local-news/osha-fines-halliburton-7k-in-fracking-site-blast-that-killed-1-worker-injured-2-in-weld-county