Most of the topsoil that forms naturally is only a few inches deep. The organic matter thst builds up over a couple of inches tall is quickly colonized and digested by things the Orkin man seeks to wipe out: termites, ants, etc. These insects do the job you are describing building their homes.
When you want to enrich a certain area, just pile up organic matter on the plot a few inches thick. Let it sit there for a few months and it will miraculously shrink. If you need or want deeper topsoil, plow or till the aged material in right before planting, then pile up some more organic matter on top. Dont worry, you wont kill all of the ants and worms.
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