Maryland Department of Transportation — State Highway Administration (MDOT SHA) · Standard Specifications for Construction and Materials
Section 469 — Porous Backfill
Maryland Standard Specifications for Construction and Materials, Section 469. Full text, cross-references and related pay items on BuildSpec.
469 — POROUS BACKFILL 2026 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 400 STRUCTURES SECTION 469 — POROUS BACKFILL 469.01 DESCRIPTION Furnish and place porous backfill material, reinforced concrete base, and pipe drains at the rear of abutments, wing walls, retaining walls, and other locations. 469.02 MATERIALS Porous Backfill, Size No. 57, Aggregate 901.01 Portland Cement Concrete 902.10, Mix No. 1 Pipe Drains Section 905 Reinforcement Steel 908.01 Geotextile, Class as specified Section 919 469.03 CONSTRUCTION Place porous backfill material in layers in conjunction with…
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