If you have a look at Dane's pond in Google earth, you will see that it is surrounded by an unpaved road that is his driveway and gets traffic from every car that arrives or departs from his house raising dust.That said, the "dustless forest pond" came over as a pretty wide stretch. Not very plausible.
It is preposterous to expect that no dust from the encircling unpaved roadway would be deposited in the pond.
Here is a satellite view of the pond Wigington sampled:
No wonder the sample contained sludge, part of which probably came from his roadway..
Careful observation will often let their own material debunk themselves.