If I were to take a guess as to why they need the 310 it’s going to be sedimentation. The purpose states right on the states website that the intent of the permit is to keep rivers and streams in as natural or existing condition as possible, to minimize sedimentation and to recognize beneficial...
That story of the 454 was how my experience was. Night before on some random work day worked best for them. Somehow agreed to say ya you can come on the weekend I guess. We got there and it was obvious we irritated they guy cause we couldn’t drop what we were doing to fit their schedule in...