Probably all in the same area. I'm guessing CrownPoint is not the killers home turf. That is a straight shot up 65 from Avon.
They (he, she) wouldn't take the chance of dumping a few parts at one location and risking being stopped or seen dumping in another location.
Yeah, that's the impression that I got, that the ponds were in the same general area. Anyhow, that just lead me to believe that they think the foot was cut off (as opposed to being chewed off by critters in the pond).