chicopee,
I think you'll be looking for a long time.... As said before, earthen dykes are basically just compacted lumps of stone, sand, mud and whatever else the builder had lying around which he then hopefully covered with something relatively impermeable, or grass, to stop it getting washed away. They really are the forgotten child of tank farm design.
Pipe entry though the bunds were allowed, but following a number of failures, nowadays are frowned on unless incorporated into a concrete wall or something a bit more substantial.
What's an SPCC?
If the work involved any removal and replacement of material I would be very concerned about the re-instatement and the join between existing and new creating a failure plane.
It is not uncommon for tank repairs to remove a section of the bund for easy ground level access, but replacement is sometimes an issue.
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