[Navy Patriot]

...just what we would store a large volume of bags of fertilizer in.

Note that they use the description "container", that doesn't necessarily mean bags.

Rack stored bags with circulating air space usually give no trouble.

[Pikachu_Dad]

So, the only material in enough volume to give such a huge bang (and one with a history of explosions) is the ammonium nitrate stored in the ‘fertilizer plant west of office’.

So how are they receiving this material?

Options:
1: There appears to be a rail spur running just to the west of the building.
2: They could be trucking it in.
That many tons, especially with such a small crew (only 8?), it had better be automated.

How are they off loading this material?
Can we see any kit? That may give us a clue.

How are they selling it?

We are talking volume shipments to farmers.