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UG Ductbank Concrete

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In light of the recent discussion regarding lean concrete used for
replacement of unsuitable in-situ soil, I have a similar question. When
encasing an underground(approx 30" below fin gr) ductbank(2 rows - each row
consists of three 2" PVC cdt), what type of concrete is normally specified?
500 psi? 1000 psi? Note that this work will occur within the mid-Atlantic
area. 

Thanks in Advance.