Over 30 million gallons of diesel fuel have been injected below the water table by 14 hydraulic fracture drilling companies.
Quoting from the New York Times article:
“We learned that no oil and gas service companies have sought — and no state and federal regulators have issued — permits for diesel fuel use in hydraulic fracturing,” said Representative Henry A. Waxman of California and two other Democratic members of the House Committee on Energy and Commerce, in the letter. “This appears to be a violation of the Safe Drinking Water Act.”
I’m sure the people who stand to profit from drilling will find some way to explain how perfectly reasonable it is to do such a thing.