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 the adjacent fill. Any fill material removed for placing the porous backfill material shall be at no additional cost to the Administration. When a form is used between the porous backfill material and the earth backfill, completely remove the form from the completed fill. Slope concrete base to drain to points of discharge.
469.04 Measurement and Payment
Porous backfill will not be measured but will be paid for at the Contract lump sum price for the pertinent Porous Backfill item. The payment will be full compensation for all excavation, concrete, reinforcement, geotextiles, drains, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. If no item for porous backfill appears in the Contract Documents, the work will not be measured but the cost will be incidental to other items specified.
Get an email when 469 changes
Maryland revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.