|The following is based on Fallout 4 cut content and has not been confirmed by canon sources.|
Dusty's message is cut holotape in the Fallout 4 add-on Nuka-World. It is recorded by Dusty. Its filename in the Creation Kit (DLC04PowerPlant_DustyHolotape,) suggests that it was intended to be found in the Nuka-World power plant.
Said we can't store anymore waste under the bottling plant while we're waiting for the new disposal system to come online. Seems like some of the barrels started leaking, so they got a bit of a mess on their hands. Luckily, the run off's just going into their little river of Quantum. Long as kids keep their hands inside the ride, we're good. Anyway, see if you can give Troy a call and get him to let us use Fizztop. There's so much room in there, no reason we shouldn't be able to use that for storage.