While it is a blog post , he does cite his sources . I can at least voich for the validity of the first section regarding the lengths that these companies go to avoid significant impacts on any cultural sites and bring tribes in on the process . The process is mandated by the government , but companies prefer to do all of the route adjustments during the planning phase rather than during construction for obvious reasons . Millions of dollars have been spent to archaeologists , environmental scientists and I ' m sure a dozen other types of experts to find the least harmful route that makes sense because it is not only the whole point of the environmental review but it also makes the best business sense .