REQUIRED MATERIALS AND EQUIPMENT LIST
- Acceptable fill materials per the Acceptable Fill Materials Section
- ADS PLUS and non-woven geotextile fabrics
- StormTech solid end caps and pre-cored end caps
- StormTech chambers, manifolds and fittings
A. This installation guide provides the minimum requirements for proper installation of chambers. Non-adherence to this guide may result in damage to chambers during installation. Replacement of damaged chambers during or after backfilling is costly and very time consuming. It is recommended that all installers are familiar with this guide, and that the contractor inspects the chambers for distortion, damage and joint integrity as work progresses.
B. Care should be taken in the handling of chambers and end caps. Avoid dropping, prying or excessive force on chambers during removal from pallet and initial placement.
ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com. Advanced Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage Systems, Inc. StormTech® and the Isolator® Row are registered trademarks of StormTech, Inc.
Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com
REQUIREMENTS FOR SYSTEM INSTALLATION
Excavate bed and prepare subgrade per engineer’s plans.
Place non-woven geotextile over prepared soils and up excavation walls. Install underdrains if required.
Place clean, crushed, angular stone foundation 6” (150 mm) or 4” (100 mm) with a single layer of Geogrid BX124GG. See plans for foundation stone design. Compact to achieve a flat surface.
MANIFOLD, SCOUR FABRIC AND CHAMBER ASSEMBLY
Install manifolds and lay out ADS PLUS fabric at inlet rows [min. 12.5 ft (3.8 m)] at each inlet end cap. Place a continuous piece (no seams, single layer) along entire length of Isolator® PLUS Row(s).
Isolator Row PLUS
Place one continuous layers of ADS PLUS fabric between the foundation stone and the Isolator Row PLUS chambers, making sure the fabric lays flat and extends the entire width of the chamber feet.
Continue installing chambers by overlapping chamber end corrugations. Chamber joints are labeled “Lower Joint – Overlap Here” and “Build this direction – Upper Joint” Be sure that the chamber placement does not exceed the reach of the construction equipment used to place the stone. No spacing is required between chambers.
Align the first chamber and end cap of each row with inlet pipes. Contractor may choose to postpone stone placement around end chambers and leave ends of rows open for easy inspection of chambers during the backfill process.
Continue installing chambers by overlapping chamber end corrugations. Chamber joints are labeled “Lower Joint – Overlap Here” and “Build this direction – Upper Joint” Be sure that the chamber placement does not exceed the reach of the construction equipment used to place the stone. Maintain minimum 6” (150 mm) spacing between rows
Attaching the End Caps
Lift the end of the chamber a few inches off the ground. With the curved face of the end cap facing outward, place the end cap into the chamber’s end corrugation.
Prefabricated End Caps
SC-160LP end caps can accept 8”(200mm) or 6”(150mm) manifold inlets. End caps can be ordered as an 8”(200mm) open hole or can be cored in the field.
STORMTECH ISOLATOR ROW DETAIL
Figure 2: Isolator Row Detail
Figure 3: Inspection Port Detail
Figure 4: Fill Material Locations
INITIAL ANCHORING OF CHAMBERS - EMBEDMENT STONE
Initial embedment shall be spotted along the centerline of the chamber evenly anchoring the lower portion of the chamber. This is best accomplished with a stone conveyor or excavator reaching along the row.
Care should be taken when backfilling not to damage the chambers. Please refer to the allowable construction vehicle loads in the Acceptable Fill Materials sections.
No equipment shall be operated on the bed at this stage of the installation. Excavators must be located off the bed.
BACKFILL OF CHAMBERS – EMBEDMENT STONE
Backfill chambers evenly. Stone column height should never differ by more than 12″ (300 mm) between adjacent chamber rows or between chamber rows and perimeter.
Uneven Backfill – Incorrect
Even Backfill – Correct
Perimeter stone must be brought up evenly with chamber rows. Perimeter must be fully backfilled, with stone extended horizontally to the excavation wall.
Perimeter Not Backfilled – Incorrect
Perimeter Not Backfilled – Incorrect
BACKFILL OF CHAMBERS – EMBEDMENT STONE AND COVER STONE
Continue evenly backfilling between rows and around perimeter until embedment stone reaches tops of chambers. Perimeter stone must extend horizontally to the excavation wall for both straight or sloped sidewalls.
FINAL BACKFILL OF CHAMBERS – FILL MATERIAL
Small dozers and skid loaders may be used to finish grading stone backfill in accordance with ground pressure limits in the Acceptable Fill Materials Section. They must push material parallel to rows only. Never push perpendicular to rows. StormTech recommends that the contractor inspect chambers before placing final backfill. Any chambers damaged by construction shall be removed and replaced.
Install non-woven geotextile over stone. Geotextile must overlap 24” (600 mm) min. where edges meet. Compact each lift of backfill as specified in the site design engineer’s drawings. Roller travel parallel
ACCEPTABLE FILL MATERIALS
D- Final Fill
Any soil/rock materials, native soils or per engineer’s plans. Check plans for pavement subgrade requirements.
Fill Material for layer ‘D’ starts from the top of the ‘C’ layer to the bottom of flexible pavement or unpaved finished grade above. Note that the pavement subbase may be part of the ‘D’ layer.
AASHTO M43 Designation*
Prepare per site design engineer’s plans. Paved installations may have stringent material and preparation requirements.
|Fill Depth Over Chambers in. [mm]||Max Axle Load For Trucks lbs [kN]||Max Wheel Load for Loaders lbs [kN]|
|36”  Compacted||32,000 ||16,000 |
36” (900 mm) minimum cover required for dump trucks to dump over chambers.
|Fill Depth Over Chambers in. [mm]||Track Width in. [mm]||Max Ground Pressure psf [kPa]|
|36”  Compacted||12” ||3420 |
|18” ||2350 |
|24” ||1850 |
|30” ||1510 |
|36” ||1310 |
Dozers to push parallel to rows until 36” (900mm) compacted cover is reached4.
|Fill Depth Over Chambers in. [mm]||Max Drum Weight or Dynamic Force lbs [kN]|
|36”  Compacted||38,000 |
Roller travel parallel to rows only until 36” (900 mm) compacted cover is reached.
A variety of placement methods may be used. All construction loads must not exceed the maximum limits listed above.
*. The listed AASHTO designations are for gradations only. The stone must also be clean, crushed, angular. For example, a specification for #4 stone would state: “clean, crushed, angular no. 4 (AASHTO M43) stone”.
**. StormTech compaction requirements are met for ‘A’ location materials when placed and compacted in 6” (150 mm) (max) lifts using two full coverages with a vibratory compactor.
***. Where infiltration surfaces may be comprised by compaction, for standard installations and standard design load conditions, a flat surface may be achieved by raking or dragging without compaction equipment. For special load designs, contact StormTech for compaction requirements.
1. 36” (900 mm) of stabilized cover materials over the chambers is required for full dump truck travel and dumping.
2. During paving operations, dump truck axle loads on 14” (350 mm) of cover may be necessary. Precautions should be taken to avoid rutting of the road base layer, to ensure that compaction requirements have been met, and that a minimum of 14” (350 mm) of cover exists over the chambers. Contact StormTech for additional guidance on allowable axle loads during paving.
3. Ground pressure for track dozers is the vehicle operating weight divided by total ground contact area for both tracks. Excavators will exert higher ground pressures based on loaded bucket weight and boom extension.
4. Mini-excavators (< 8,000lbs/3,628 kg) can be used with at least 12” (300 mm) of stone over the chambers and are limited by the maximum ground pressures in Table 2 based on a full bucket at maximum boom extension.
5. Storage of materials such as construction materials, equipment, spoils, etc. should not be located over the StormTech system. The use of equipment over the StormTech system not covered in Table 2 (ex. soil mixing equipment, cranes, etc) is limited. Please contact StormTech for more information.
6. Allowable track loads based on vehicle travel only. Excavators shall not operate on chamber beds until the total backfill reaches 3 feet (900 mm) over the entire bed.