Yes, but if a chemical...as in this case is not considered hazardous, then they won’t be monitoring for it.
Also note the excerpt you posted does not include ...chemicals.
As I indicated previously, they will only monitor what they are required to monitor. Chemicals have properties that may, just may, affect the readings on the sensors. Look, I’m not going debate nits over this. Hell, given it’s WV, they prolly only ensure that a liquid exits the plant.