7−11depths as listed in the Proposal. The price so-sta ted constitutes full and co mplete compensation for all labor, materials, and equipment for providing such additional structure depth, complete and accepted by the Engineer. 702.05.2 Metal Frames and Grates and/or Covers. The accepted quantities of "Metal Frames and Grates" and "Metal Frames and Covers" of the various types and sizes indicated on the Plans will be paid for at the respective contract unit prices per each such assembly as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment for providing said assemblies and for all incidentals required to finish the work, complete and accepted by the Engineer.
702.05.3 Precast Concrete Inlet and Apron Stones. The accepted quantities of "Precast
Concrete Inlet Stones" and "Precast Concrete Apron Stones" of the various types indicated on the Plans will be paid for at the respective contract unit prices per each such unit as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment for providing said units and for all incidentals required to finish the work, complete and accepted by the Engineer. "Structure Excavation-Rock" and "Structure Excavation; Rock-Mechanical" will not be included in the contract unit prices for the various types of drainage structures but will be paid for separately as set forth in Subsection 203.05.1 of these Specifications.
703.01 DESCRIPTION . This work consists of constructing underdrains and/or combination drains,
in reasonably close conformity with the dimensions and details indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 703.02 MATERIALS. 703.02.1 Pipe. Unless otherwise indicated on the Plans, the following types of pipe shall conform to the applicable requirements of SECTION M.04; DRAINAGE, of these Specifications.
a.Perforated Concrete Pipe.
b.Perforated Corrugated Aluminum Alloy Underdrain Pipe.
c.Perforated Corrugated Polyethylene Drainage Pipe.
d.Perforated Corrugated Polyvinyl Chloride Pipe.
703.02.2 Filter Fabric. Filter fabric shall be a material suitable for underdrain applications and
shall be one of those included on the Department's Approved Materials List. 7−12 703.02.3 Inspection of Materials. All materials will be subject to periodic inspection for compliance with approved methods of manufacture. Material samples will be obtained by the Engineer for laboratory testing to determine compliance with Specifications. In addition, material test certificates shall be required. Such inspection of manufacturing plants, materials testing, and certificates shall provide the basis for acceptance of materials. 703.02.4 Filter and Bedding Materials.
a.Filter Stone, Fine Aggregates, and Bedding Stone shall conform to the applicable requirements of SECTION M.01 of these Specifications.
703.03 CONSTRUCTION METHODS. 703.03.1 General. The specified sizes and types of underdrains and/or combination drains shall
be constructed in accordance with the lines and grades shown on the Plans. The various types of pipe shall not be interchanged or interconnected except through the introduction of appropriate manholes or catch basins.
a.Structures. Manholes and catch basins required for underdrain and/or combination drain installation shall conform to the applicable requirements of SECTION 702; MANHOLES, INLETS, AND CATCH DRAINS , of these Specifications.
703.03.2 Installation of Pipe.
a.Layout. Layout of pipe shall conform to the requirements of Subsection 701.03.1 of these Specifications.
b.Trench Excavation . Trenches shall be excavated in accordance with the applicable requirements of SECTION 205 of these Specifications. Trench excavation shall be carried to the width indicated on the Plans, or as directed by the Engineer, to allow for both the thorough compaction of the bedding and backfill material under and around the pipe. Trench walls shall be either vertical or as near vertical as conditions will permit.
c.Bedding and Filter Fabric. A bedding layer of specified filter stone, fine aggregate, or a filter fabric shall be placed within the trench for its full width and length as indicated on the Plans.
d.Laying Drains. Underdrains and combination drains of the type and size specified shall be embedded firmly in the filter stone. Perforated pipe shall be placed with the perforations down for underdrains and up for combination drains, and the pipe shall be joined securely with the appropriate coupling fittings or bands. The upgrade ends of all underdrain pipe shall be closed with plugs to prevent entry of soil materials as approved by the Engineer. After the pipe installation has been inspected and approved, filter stone shall be placed to the required height above the top of pipe, all as shown on the Plans. Any remaining portion of trench above the filter stone shall be filled with fine aggregate as specified or shown. The fine aggregate shall be compacted using moderate compactive effort by making two passes with a 7−13vibratory compactor.
e.Outlets. Outlet pipes shall be placed in trenches with all ends securely jointed by methods recommended by the manufacturer of the particular type of pipe. After inspection and subsequent approval of the outlet pipe installation by the Engineer, the trench shall be backfilled with approved granular material. This material shall be placed in 12-inch layers and compacted with moderate compactive effort by use of approved vibratory equipment. 703.03.3 Unauthorized Excavation. If the bottom of any trench has been excavated below the grade indicated on the Plans, or as directed by the Engineer, it shall be brought back to grade by refilling with a well-compacted bedding material of a type selected by the Engineer. No payment will be made for unauthorized excava tion. Moreover, the Contractor shall furnish, place, and compact the bedding material used to refill the trench to grade at no additional cost to the State. 703.04 METHOD OF MEASUREMENT. "Underdrains" and "Combination Drains" of the various types and sizes indicated on the Plans, together with their respective outlets, will be measured in linear feet of continuous runs of such drains and outlets actually installed in accordance with the Plans and/or as directed by the Engineer. 703.05 BASIS OF PAYMENT. The accepted quantities of the various types and sizes of "Underdrains" and "Combination Drains" will be paid for at their respective contract unit prices per linear foot as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment for providing said underdrains and combination drains including all trench excavation (except Trench Excavation - Rock and Trench Rock Excavation/Mechanical), bedding, filter stone, filter fabric, placing and compacting backfill, and all incidentals required to finish the work, complete and accepted by the Engineer. "Trench Excavation - Rock" and "Trench Rock Excavation/Mechanical" will not be included in the contract unit prices for the various types of underdrains and combination drains but will be paid for separately as set forth in Subsection 205.05.1 of these Specifications. SECTION 704 RECONSTRUCT CATCH BASINS AND MANHOLES
704.01 DESCRIPTION . This work consists of reconstructing existing catch basins and manholes
in accordance with the dimensions and details indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 704.02 MATERIALS. Materials used in reconstructing existing drainage structures shall conform to the requirements of Subsection 702.02.1; Masonry Unit Construction , of these Specifications.
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 317–319 of 826.