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The growing medium for plants, primarily consisting of rock fragments, organic material, water, and organisms.

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How thick does the impermeable layer need to be when grading a yard?

I plan to use regular, fairly dense soil from elsewhere in the yard. Considering that no soil is completely impermeable, how thick should I make my soil layer to be effective? … Do I really need to test the permeability of my soil?? That seems like overkill... …
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