An internal audit by the National Energy Board into diesel emissions measurements from diesel engines at a Saskatchewan refinery found that at least three of the four diesel-emission measurement instruments used by the company had been tamper-evident.
The audit by CNB-Canada’s Oil, Gas and Mining division, which is led by the oil-and-gas regulator, concluded that some of the instruments could have been changed in a way that would have caused an engine to emit a different number of emissions from its intended value.
In an email, CNB spokesman Michael Kowalchuk said that the investigation is ongoing.
He said it was too early to speculate on what might have happened.
The agency is now reviewing the report and its recommendations, he said.
In Saskatchewan, the agency oversees two oil- and gas-producing refineries and a number of other industries.
The report found that CNB employees at the plant were aware of a possible tamper and “repeatedly made attempts to correct the instrument” but failed to take any action.
The company’s technical staff also were aware and tried to correct a tamper but did not take any immediate action.
Kowaluk said that at the time of the audit, there was no evidence that CNBS employees had tampered in the performance of their jobs.
He added that the company was cooperating with the investigation.