This section detail shows a concrete utility vault embedded within compacted engineered fill, indicating exterior and interior dimensions with finish grade elevations varying at the top surface. The vault structure features concrete walls and a top slab with specified thicknesses, sitting on a base with a seven-foot-thick layer of compacted engineering fill below. Vertical dimensions measure eight feet from the underside of the base to the top of the wall, with specific step-down dimensions indicated on the top interior slab.
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