Thanks David, in addition to your advice I got some advice from the OFMEM on this topic.
“In addition to the outdoor storage terms of Division B of the Fire Code Subsection 4.2.11 that could apply (and the other related Part 4 aspects for handling, spill control, containers etc.), there may be other municipal considerations – particularly for temporary structures or construction sites, for which there may be zoning/site agreement terms, and on railway lands, for which federal rules could apply or agreements could exist”.
Scott