If I was there knowing full well what was there, I would have backed off at least a full mile away from the plant. A withdrawal distance.
Potassium nitrate is used to make to fertilizers to also include old fashion gun powder and nitric acid and all other types of nitrate explosives like TNT.
Really irresponsible that local officials would allow development so near this plant.
Absolutely criminal the placement of that plant. Busy year for Texas lawyers.