604.01 604-1 SECTION 604 MANHOLES, INLETS, AND METER VAULTS DESCRIPTION
604.01 This work consists of the construction of manholes, inlets, and meter vaults per these
specifications, and in conformity with the lines and grades shown on the plans or established. MATERIALS
604.02 Concrete for these structures shall meet the requirements of Section 601 -Structural
Concrete. Other materials shall meet the requirements specified in the following subsections: Clay or Shale Brick 704.01 Concrete Brick 704.02 Concrete Masonry Blocks 704.03 Frames, Grates, Covers, and Steps 712.06 Grade Ring 712.05 Reinforcing Steel 709.01 Precast Concrete Units 712.05 CONSTRUCTION REQUIREMENTS
604.03 Excavation. Excavation shall be per the requirements of Section 206.
604.04 Manholes, Inlets, and Meter Vaults.
a.General. Concrete construction shall conform to the requirements of Section 601. Masonry shall conform to the requirements for the respective type. When specified, the outside face of structures shall be plastered with a 1/2- inch-thick cement -sand mortar coat. Unless otherwise provided, exposed surfaces of concrete and masonry shall be cured as defined in subsection 601.13. Pipe sections on the inside of manholes or inlets shall be treated as shown on the plans, or as directed, and shall project outside sufficiently for proper connection with the next pipe section. Masonry shall fit neatly and tightly around the pipe.
b.Manholes. Wherever directed by the Engineer, pipes of the proper type and size shall be built into a manhole where future laterals are to be connected. These pipes shall be sealed at their outer ends and an invert shall be built into each manhole for such lateral connections. When a manhole is located in the pavement area, it shall not be constructed to final grade until the pavement has been completed.
c.Inlets. Where inlets are placed in existing curbs or gutters, the Contractor shall carefully remove sections of the present curb, gutter, or curb and gutter. All damage to sections to remain in place shall be repaired at the Contractor's expense. The top portion of inlets shall be constructed concurrently with the adjacent curb and gutter to ensure proper alignment of grades unless otherwise permitted in writing. 604.05 604-2 (d) Meter Vaults. Meter vaults shall be of sufficient size to properly accommodate the size of the meter installed including regulatory devices or fittings required for the utility supplied. Provisions for grounding, ventilation, drainage, or other safety precautions shall be constructed as required. Meter vaults may be cast -in-place or precast and shall conform to the rules and regulations for the utility service supplied in the vault.
e.Brick Masonry . All bricks shall be thoroughly wetted, before being laid, either by immersion or in a manner satisfactory to the Engineer. Special care shall be taken to make the face of the brickwork smooth. All joints on the interior surface of the manholes and appurtenances shall be carefully struck. Brick shall not be laid upon a concrete foundation until the concrete has set.
604.05 Backfilling. Unless otherwise directed, all excavations shall be backfilled
immediately after the structures are built. Backfilling shall conform with Section 206 and as shown on the plans. Resurfacing. Excavations in existing streets, except streets that are to be closed or abandoned, shall be resurfaced as soon as practicable with the type and thickness of bases and pavement shown on the plans or as designated. Cleaning. The structures and all appurtenances shall be thoroughly cleaned before final acceptance of the work. When the new facilities interfere with the existing flow of sewage, the Contractor shall provide satisfactory bypass facilities at the Contractor’s expense. METHOD OF MEASUREMENT
604.06 Manholes and inlets will be measured by the complete unit including ring and cover
or grating and frame. Manhole ring and cover used separately will be measured by the unit. Inlet grating and frame used separately will be measured by the unit. Manhole and inlet depth, "H," will be measured as shown on the plans. Measured depth and pay depth of manholes and inlets shall conform to the following: Table 604 -1 MEASURED DEPTH AND PAY DEPTH OF MAN HOLES AND INLETS Measured Depth Pay Depth 0.0 to 5.0 feet 5 feet 5.1 to 10.0 feet 10 feet 10.1 to 15.0 feet 15 feet (Continued thus) Meter vaults will be measured by the complete unit including ring and cover. 604.07 604-3 Structure excavation and structure backfill for manholes, inlets, and meter vaults will not be measured and paid for separately but shall be included in the work. BASIS OF PAYMENT
604.07 The accepted quantities will be paid for at the contract unit price for each of the pay
items listed below that appear in the bid schedule. Except as otherwise indicated on the plans or in the special provisions, all connecting devices will not be measured and paid for separately but shall be included in the work. Payment will be made under: Pay Item Pay Unit Meter Vault Each Manhole ______ (____) Each Inlet, Type ______ (_____Foot) Each Manhole Ring and Cover Each ___ Inlet Grating and Frame Each 604.07 604-4 THIS PAGE INTENTIONALLY LEFT BLANK 605.01 605-1 SECTION 605 SUBSURFACE DRAINS DESCRIPTION
605.01 This work consists of constructing underdrains, edge drains, geocomposite drains, and
french drains, per these specifications and in conformity with the lines and grades shown on the plans or established. MATERIALS
605.02 Materials shall meet the requirements specified in the following subsections:
Corrugated Steel Pipe 707.04 Bituminous Coated Corrugated Steel Pipe 707.05 Drain Tile 706.04 Vitrified Clay Pipe 706.06 Corrugated Aluminum Pipe 707.07 Plastic Pipe 712.11 Gaskets 705.03 Filter Material 703.09 Geotextiles 712.08 Geocomposite Drains 712.12 Pipe for subsurface drains shall be any type of pipe material listed above. When corrosion resistant pipe is specified on the plans, the materials shall conform to the requirements of Section 624 for the corrosion resistance number specified. Subsurface drain outlet pipe may be perforated or nonperforated, and shall meet the requirements specified in subsections 707.04, 707.05, 707.07, or 712.11. CONSTRUCTION REQUIREMENTS
605.03 Pipe Underdrain and Pipe Edge Drain . The trench shall be excavated to the
dimensions and grade shown on the plans. Sufficient Geotextile (Drainage) (Class 3) shall be placed along the bottom and sides of the trench as shown on the plans to provide the required overlap over the top of the fi lter material. Filter material of the class designated on the plans shall be placed in the bottom of the trench for its full width and length. Perforated pipe shall be placed with the perforations down and the pipe sections shall be joined securely with the appropriate coupling fittings or bands. Joining shall conform to the applicable requirements of subsection 603.07 except as noted above. After the pipe installation has been inspected and approved, the designated filter material shall be placed to a height of 12 inches above the top of pipe. Care shall be taken not to displace the pipe or the covering at open joints. The remainder of the filter material shall then be placed to the required height, the drainage geotextile folded over the top of the filter material, and the remainder of the trench backfilled.
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 611–614 of 943.