Compacted structural backfill is placed over the existing concrete slab at the tunnel lid to a maximum depth of eight feet. An existing sloped concrete slab extends over the escalator adjacent to the backfill zone. The assembly interfaces directly with the existing concrete tunnel lid.
(E) SLOPED CONC SLAB OVER ESCALATOR COMPACTED STRUC BACKFILL OVER (E) TUNNEL LID (MAX DEPTH = 8'-0") (E) CONC SLAB AT TUNNEL LID
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