If dumping occurs at the usual altitudes it's supposed to, it dissipates, but that's not necessarily the case down low. AA
had a widebody takeoff a few years ago from DFW
(heading north) and had a problem that necessitated an immediate return. They started dumping on the climbout, and some suburbs to the N-NW
(Lewisville and Flower Mound) had neighborhoods where parked cars and other surfaces had a thin coating of fuel residue on them.
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