Essentially, our first step is to publish a draft that's open for a 60-day public comment period. People provide us with data, and sometimes just their opinions. Ultimately, what we need is science data, some piece of evidence, so we can say, “Oh yes, you know what, we didn't consider this. This is new science or something we just weren't aware of.” We factor that in.
In some cases, as we have gone from draft to final, we've adjusted our conclusion based on data that was provided. Sometimes even after we've published the final, new data becomes available. We make our conclusions at a snapshot in time based on the information that we have. Science continues to evolve. Monitoring continues to evolve. So as that data becomes available, we factor it in, and sometimes we've been known to revise our conclusions.