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. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 470 — UTILITIES ON STRUCTURES 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 400 STRUCTURES SECTION 470 — UTILITIES ON STRUCTURES
470.01 Description
Place utility markers to identify utilities when they are newly installed, replaced, or relocated. Place the identification markers as specified herein and as approved.
470.02 Materials
Utility Facility Identification.
a.Any new or replacement utility facility installed shall include an identification marker with the first 50 ft of the facility, the last 50 ft of the facility, and at intervals of 100 ft in-between.
1.Adjust the spacing to have one marker in every bay bounded by beams and diaphragms through which the utility passes.
b.The marker shall consist of decals or stenciling onto the pipe or carrier according to industry standard color coding with high quality black or white print.
1.Provide lettering height of 1/3 the pipe diameter, but not smaller than 1 in. nor larger than 4 in.
2.The markers shall include the name of the utility and a description of the contents including pressure, voltage, and any other pertinent information required by industry standards. LABEL BACKGROUND COLOR / LETTERING COLOR CONTENT RED Electrical Power YELLOW Gas, Oil Steam, Petroleum or Gaseous Materials ORANGE Communication, CATV, Alarm, or Signal BLUE Potable Water PURPLE Reclaimed Water, Irrigation, or Slurry GREEN Sewer and Storm Drain Figure 470.02(b) – Industry Standard Color Coding
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 592–592 of 1,113.