4000 gallons (because I wouldn't doubt if it was closer to that) is about 530 cubic feet and it's got 30 or so miles between the spill and the narrows (including a lake) so it's unlikely you'll see/smell any diesel that far down stream of the spill.
My guess is that they'll be able to get most of the surface contamination handled above the Georgetown lake. The stuff that mixes and flows with the flotsam will likely make it to the lake and cause havoc there for many years. It's crazy that the article mentioned that they're still monitoring past spills from years back. Sad.
EDIT: contained was a bad choice.. the 4000 will have dispersed into the habitat before and onto the lake. I don't think they contained the initial 4000 gallons.
On the river, I can abandon who I am and what I've done. However brief it lasts, while on the river I am nothing important and everything insignificant. I am flotsam, and happy to be so.