Thanks again! Latest update: the controlled explosions successfully avoided a catastrophic explosion (but released a massive black cloud that could even been seen on radar). As of this afternoon, the evacuation order was rolled back since the EPA claims air quality levels are good with no presence of toxins. Groundwater pollution is limited to one stream near the tracks. No one has done soil testing yet, that I've seen. I still have questions about the EPA data and long-term health and environmental impacts, but the immediate concern over an explosion has passed.