A House probe of hydraulic fracturing showed that two oilfield services companies acknowledged the use of diesel in the drilling process. BJ Services admitted to using 1,706 gallons of diesel-based slurry in 24 coal-bed methane fracturing projects from 2005 to 2007, while Halliburton said it used more than 807,000 gallons of the fuel over the same period. The companies, however, did not state whether the fluids were injected into wells near underground water supplies, which could pose contamination concerns.

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