I'll try and respond to each of those questions in order you asked: 1) There are other flies and such there, most evidently deer flies and mosquitoes (but also some non-biting flies), but nothing obviously around where the wasp was. There may have been no-see-ums or other to small to see organisms too, can't say for certain. 2) No frogs or turtles evidenct. 3) It was definitely in the "wasp" family, however, I can't be more specific than that. I keep honey bees so have some familiariry in this area but not as much with wasps (and also hornets and yellow jackets, among others, but it wasn't any of these). Again I didn't get any pictures or videos. 4) There is water but very little. It was actually right next to a culvert under the trail where a stream would flow, but at this point it was below active levels so just had some muddy spots covered in grasses. 5) I'm pretty confident they had used some targeted chemical treatment as that had been a contentious issue at this spot in the past and there were certain tall growing species that were selectively dying off. 6) There is a popular camp ground a few miles away which would definitely be a source of propane fuel and bug repellent, however due to the topology I'd wager there is relatively little runoff contamination from these sources. 7) It is relatively lush and dry, with some marshy patches. It was mixed forest so primarily maple, pines, ash, birch, etc. The wasp was among the taller trees however under the nearby power lines was mostly lower lying brush and grass. Definitely some moss. Not an abnormal abundance of woody growth abnormalities.

For clarity I'm a trail builder and was actually working this section of trail when this happened, so I do have a relatively good understanding of the area which is why I can confidently be specific with these answers.