SECTION_33_49_23_Storm_Drainage_Water_Retainage_Structures.docx
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SECTION 33 49 23 SUBSURFACE DETENTION SYSTEMS
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SECTION 33 49 23
SECTION 33 49 23
SUBSURFACE DETENTION SYSTEMS
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Units for subsurface detention and infiltration systems. |
| B. | Related work includes but is not limited to: |
| 1. | Excavation, Section 31 23 16. |
| 2. | Backfilling for Structures, Section 31 23 23. |
| 1.2 | REFERENCES |
| A. | AASHTO M 252: Standard Specification for Corrugated Polyethylene Drainage Pipe. |
| B. | AASHTO M 294: Standard Specification for Corrugated Polyethylene Pipe, 300- to 1500-mm Diameter. |
| C. | ASTM D 698: Standard Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kNm/m3)). |
| D. | ASTM D 1557: Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3 (2,700 kN-m/m3)). |
| E. | ASTM D 1784: Standard Specification for Rigid Polyvinyl Chloride (PVC) Compounds and Chlorinated Polyvinyl Chloride (CPVC) Compounds. |
| F. | ASTM D 2239: Standard Specification for Polyethylene (PE) Pipe (SDR-PR) Based on Controlled Inside Diameter. |
| G. | ASTM D 2564: Standard Specification for Solvent Cement for Polyvinyl Chloride (PVC) Plastic Pipe and Fittings. |
| H. | ASTM D 2657: Standard Recommended Practice for Heat Joining of Thermoplastic Pipe and Fittings. |
| I. | ASTM D 3212: Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals. |
| J. | ASTM D 3261: Standard Specification for butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing. |
| K. | ASTM D 3350: Standard Specification for Polyethylene Plastics Pipe and Fittings Materials. |
| L. | ASTM F 477: Standard Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe. |
| M. | ASTM F 667: Standard Specification for Large Diameter Corrugated Polyethylene Tubing and Fittings. |
| N. | ASTM F 1055: Standard Specifications for Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene Pipe and Tubing. |
| O. | ASTM F 2418: Standard Specification for Polypropylene (PP) Corrugated Wall Stormwater Collection Chambers. |
| P. | ASTM F 2736: Standard Specification for 6 to 30 in. Polypropylene (PP) Corrugated Single Wall Pipe and Double Wall Pipe. |
| Q. | ASTM F 2787: Standard Practice for Structural Design of Thermoplastic Corrugated Wall Stormwater Collection Chambers. |
| 1.3 | DEFINITIONS |
| A. | Chamber System: Arched units with open bottoms interconnected by piping, headers, and/or manifolds. |
| B. | Cellular System: Open-structured units that can be placed side by side and stacked vertically to form an open-sided storage tank-like structure. |
| 1.4 | SUBMITTALS |
| A. | Manufacturer’s product data for detention system components. |
| B. | Manufacturer’s installation instructions for the system. |
| C. | Material certificates for geofabrics, granular fill and backill materials. |
| 1.5 | DELIVERY, STORAGE AND HANDLING |
| A. | Protect materials from damage during delivery. |
| B. | Store on smooth surfaces free from dirt, mud and debris. Store outside only if outside air temperatures are at or above 55 degrees Fahrenheit. |
| C. | If materials will be stored for more than four days, cover materials with tarp. |
| 1.6 | PROJECT CONDITIONS |
| A. | Review manufacturer’s installation procedures and coordinate work with other work affected. |
| B. | Do not use frozen materials or materials mixed or coated with ice or frost. |
| C. | Do not build on frozen, wet, saturated or muddy subgrade. |
| D. | Protect partially completed installation against damage from other construction traffic when work is in progress and when backfill is complete until construction is complete. |
| PART 2 | PRODUCTS |
| 2.1 | CHAMBER SYSTEM |
| A. | Chamber: |
| 1. | Polyproylene per ASTM F 2418 |
| 2. | Open-bottomed |
| 3. | Minimum Design Live Load: AASHTO H20 |
| B. | Piping, Headers, and Manifolds: Polyethylene, polypropylene, or polyvinylchloride per system manufacturer’s requirements. |
| C. | Fittings: Per system manufacturer’s requirements. |
| D. | Foundation Stone: |
| 1. | Clean, angular stone with size gradation per system manufacturer’s requirements. |
| 2. | Compact to minimum density required by system manufacturer. |
| 3. | Depth: 6”, 12”, or 18” as indicated. If not specified, depth will be 6”. |
| E. | Embedment Stone: |
| 1. | Clean, angular stone with size gradation per system manufacturer’s requirements. |
| 2. | Unless otherwise required by system manufacturer, do not compact embedment stone. |
| 3. | Depth above top of chambers: Minimum of 6”. |
| F. | Fill Material: |
| 1. | Minimum depth: 8” or as required by system manufacturer. |
| 2. | Maximum depth: Per system manufacturer. |
| 3. | Material: |
| a. | 6” to 18” above chamber: Granular well-graded soil or aggregate mixture per system manufacturer’s requirements. |
| b. | Greater than 18” above chamber: Native soils free from organic and deleterious materials, as indicated, or as otherwise required by system manufacturer. |
| 4. | Compaction per system manufacturer’s requirements. |
| G. | Geotextile: Per system manufacturer’s requirements. |
| 2.2 | CELLULAR SYSTEM |
| A. | Cells: Manufactured from a plastic material. |
| 1. | Minimum Design Load: AASHTO H20 |
| 2. | Maximum Depth: 11’ from bottom of cellular units to finish grade. |
| B. | Base: |
| 1. | Minimum of 6” of crushed stone per system manufacturer’s requirements. |
| 2. | Compaction per system manufacturer’s requirements. |
| C. | Side Fill: |
| 1. | Minimum of 12” width. |
| 2. | Crushed stone per system manufacturer’s requirements. |
| 3. | Compaction per system manufacturer’s requirements. |
| D. | Top Fill: A minimum of 12” of crushed stone or roadbase material per system manufacturer’s requirements. |
| 1. | Minimum Cover: 24” from the top of the cellular units to finish grade. |
| 2. | Maximum Cover: 36” from the top of the cellular units to finish grade. |
| E. | Geogrid: Per manufacturer’s requirements. |
| F. | Geotextile: Per manufacturer’s requirements. |
| G. | Maintenance ports, cleanouts, and pipe inlets and outlets: Prefabricated per manufacturer’s requirements. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Excavate to limits indicated. |
| B. | Prepare subgrade according to system manufacturer’s requirements. Bottom shall be smooth, level, and free of lumps or debris. |
| 3.2 | INSTALLATION |
| A. | Install subsurface detention system components according to system manufacturer’s installation instructions. |
| B. | Backfill according to system manufacturer’s requirements. Do not backfill until COR has accepted system component installation. |
| 3.3 | CLEANING |
| A. | Perform cleaning during the installation of the work and upon completion of the work. |
| B. | Remove from site all excess materials, debris, and equipment. |
| C. | Repair any damage to adjacent materials and surfaces resulting from installation of the work. |
END OF SECTION
SUBSURFACE DETENTION SYSTEMS Page 1
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