All of the tasks presented in the Norfolk Southern consultant's workplan are consistent with the tasks I would recommend in this scenario (soil removal, area air monitoring, vacuuming up the liquid product at the site, aerated the nearby waterways to promote degradation, etc.). Arcadis is the consultant of record for the cleanup efforts and they are generally a good firm to rely on.

https://response.epa.gov/sites/15933/files/East%20Palestine%20RAWP%20Feb%2010%202023.pdf

The only thing which I am unsure about is the emergency release of the vinyl chloride to the air. Without additional information, which isn't public yet, I can't really say whether or not it was the best course of action as it sounds like there was a danger of explosion, which goes beyond environmental cleanup and bleeds into mechanical engineering.