436-1 Description.
Construct trench drain, with one of the materials listed below, for the purpose of collecting and removing surface run -off from paved areas. Furnish and install trench drain in accordance with the Standard Plans , at the locations shown in the Plans or as directed by the Engineer.
436-2 Materials.
Provide preformed channels or pipe with sufficient strength to withstand construction handling and placement of concrete backfill without deforming or deviating from line and grade. Submit certification to the Engineer from the man ufacturer that the trench drain system meets the requirements of this Section.
436-2.1 Channels/Pipe: Meet the following requirements:
Steel Pipe ................................ ............................ Section 943 Aluminum Pipe ................................ ................... Section 945 Polyethylene ......................... Section 948 and ASTM D3350 Polymer Concrete ................................ ............ASTM D6783 Fiberglass ................................ ........................ ASTM D3517
436-2.2 Concrete Backfill: Use concrete that meets the requirements of Section 347.
436-2.3 Grates: Provide steel grates and supporting frames that meet the requirements of
Section 962. Ductile iron frames and grates must meet the requirements of ASTM A536. Ensure that ductile iron grates and frames are compatible and from the same manufacturer. Frames must be anchored into the concrete backfill with studs bolts or lugs. Grates must have at least 30% open area and fasten securely to frames to avoid rattling, Grates must be removable for the entire channel length and have vandal resistant locking devices. Ensure that frames have a minimum of 4 inch long studs, bolts or lugs at all four corners.
436-2.4 Clean -Out covers for Type 1 Dra ins: Install steel or ductile iron covers that
meet the requirements of Section 962.
436-2.5 Outlet Pipe: Connect outlet pipe to the trench drain with standard manufactured
connectors. Unless a particular type is called for in the Plans, use any of the following types of pipe: Concrete ................................ .............................. Section 449 Steel................................ ................................ .....Section 943 Aluminum ................................ ........................... Section 945 Polyvinyl Chloride ................................ .................... 948-1.7 Polyethylene ................................ ............................... 948.2.3
436-3 Installation.
Submit to the Engineer the proposed method of installation, noting any deviation from the manufacturer’s recommendations. Place concrete backfill in the trench against undisturbed material at the sides and bott om of the trench in a manner that will prevent floating or shifting of the trench drain, and will prevent voids in, or segregation of the concrete. Tamp and spade to prevent honeycombing. Form the top surface to the lines shown in the Plans. Remove any foreign material that falls into the trench prior to or during placement of concrete. FY 2023-24 Return to Table of Contents
436-4 Method of Measurement.
The quantity to be paid for will be plan quantity, in place and accepted. The plan quantity will be measured from the inside wall of the struct ure as shown in the Plans, along the centerline of the pipe/channel. Curb placed with trench drain will be paid in accordance with Section 520.
436-5 Basis of Payment.
Price and payment will be full compensation for all work specified in this Section, including all materials, tools, equipment, concrete backfilling, outlet pipe, connections to new or existing structures and all incidentals necessary to complete the work. Payment will be made under: Item No. 436 - 1- Trench Drain - per foot. FY 2023-24 Return to Table of Contents SECTION 440 UNDERDRAINS
440-1 Description.
Construct underdrains, underdrain cleanout structures, underdrain inspection boxes and underdrain outlet pipes in accordance with the Plans and Standard Plans, Indexes 440 -001 and 440-002. Use any one of the types of pipe listed in 440 -2, unless a particul ar type is specifically required. Use only perforated pipe, and do not use open joints.
440-2 Materials.
Meet the following requirements: Concrete Pipe ................................ ...................... Section 449 Filter Aggregate ................................ .................. Section 902 Corrugated Steel Pipe ................................ .........Section 943 Corrugated Aluminum Pipe ................................ Section 945 Polyvinyl -Chloride Pipe ................................ ......Section 948 Corrugated High Density Polyethylene Pipe ......Section 948 Corrugated Polypropylene Pipe .......................... Section 948 Steel Reinforced Polyethylene Ribbed Pipe .......Section 948 Filter Fabric Sock ................................ ................ Section 948 Geotextile Fabrics* ................................ .............Section 98 5 *Use products listed on the Department’s Approved Product List (APL).
440-3 Excavating Trench.
Excavate the trench carefully, to the depth required to permit the pipe to be laid to the grade required, and to the dimensions shown in the Plans.
440-4 Laying Pipe.
440-4.1 General: Bed the pipe firmly on the bottom of the trench, with the perforations
down and joints securely made.
440-4.2 Corrugated Steel Pipe - Protection of Coating: Handle corrugated steel pipe in
such a way that the zinc or aluminum co ating will not be bruised or broken. Do not use pipe showing bruises or breakage of the zinc or aluminum coating.
440-4.3 Protection of Drain Inlet: Protect the influent end of the pipe in a manner which
will prevent any soil from entering the drain.
440-4.4 Lateral Connections: Make lateral connections with prefabricated wyes, tees,
elbows, etc., as required.
440-4.5 Underdrain Inspection Box: Construct underdrain inspection boxes in
accordance with Standard Plans, Index 440-002 and the Plans.
440-4.6 Underdrain Cleanout Structures: Construct underdrain cleanout structures of
in-line wye fittings and stub for access where called for in the Plans.
440-4.7 Underdrain Outlet Pipe: Use non-perforated pipe. Construct underdrain bends
in accordance w ith Standard Plans, Index 440 -002.
440-5 Placing Filter Material and Backfilling.
440-5.1 Placing Material: After laying the pipe and obtaining the Engineer’s approval,
backfill the trench with filter material to the lines shown in the Plans. FY 2023-24 Return to Table of Contents