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Originally Posted by RWebb
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It looks to me the companies are doing exactly as required. They monitored. They reported. They have/are taking corrective action.
Shell said that it had used the monitoring data at its Deer Park refinery to "identify a single operational activity near the fence line that drove the outcome, conduct an investigation on the cause and apply corrective measures."
The company added that as of the fourth quarter of 2019, the facility's rolling annual average is 6.99 micrograms per cubic meter, which is below the EPA threshold of 9.
Ohio-based Marathon Petroleum said in a statement it had traced its high emissions to a relief valve, fixed the issue and gone even further: "In addition to correcting the one-time relief valve situation, we have installed additional emissions controls on several of our storage tanks and deployed mobile monitoring sensors that provide real-time emissions data, so we can identify potential sources and address them."
In a one-sentence statement, Valero pointed out that its current benzene monitoring averages are below the threshold.