ADS MC-3500 StormTech Chamber and End Cap Installation Guide

ADS MC-3500 StormTech Chamber and End Cap

Required Materials and Equipment List

• Acceptable fill materials per Table 1
• ADS Plus and non-woven geotextile fabrics
• StormTech solid end caps, pre-cored and pre-fabricated end caps
• StormTech chambers, manifolds, and fittings

Important Notes:

• This installation guide provides the minimum requirements for the proper installation of chambers. Nonadherence 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.
• The use of a dozer to push embedment stone between the rows of chambers may cause damage to chambers and is not an acceptable backfill method. Any chambers damaged by using the “dump and push” method are not covered under the StormTech standard warranty.
• Care should be taken in the handling of chambers and end caps. End caps must be stored standing upright. Avoid dropping, prying or excessive force on chambers during removal from the pallet and initial placement.

Requirements for System Installation

• Excavate bed and prepare subgrade per engineer’s plans. Plans and specifications should include Best Management Practices (BMPs) to deter contamination of open pits during construction.
• Place non-woven geotextile over prepared soils and up excavation walls.
• Place clean, crushed, angular stone foundation 9″ (230 mm) min. Install underdrains if required. Compact to achieve a flat surface.

Manifold, Scour Fabric, and Chamber Assembly

• Install manifolds and layout ADS PLUS fabric at inlet rows Imin. 17.5 ft (5.33 m)] at each inlet end cap. Place a continuous piece (no seams) along the entire length of the Isolator PLUS Row(s).
• Align the first chamber and end cap of each row with inlet pipes. The 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
  • UpperJoint” 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 MC-3500 rows and 9″ (230 mm) spacing between MC-4500 rows.
• Place a continuous layer 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. When used on an Isolator Row PLUS, a 24″ FLAMP (flared end ramp) is attached to the inside of the inlet pipe with a provided threaded rod and bolt. The FLAMP then lays on top of the ADS PLUS fabric.

Manifold Insertion

Insert the inlet and outlet manifold a minimum of 12″ (300 mm) into chamber end caps. Manifold header should be a minimum of 12″ (300 mm) from the base of the end cap.

StormTech Isolator Row Plus Detail

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.

No equipment shall be operated on the bed at this stage of the installation. Excavators must be located off the bed. Dump trucks shall not dump stones directly on to the bed. Dozers or loaders are not allowed on the bed at this time.

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.

Perimeter stone must be brought up evenly with chamber rows. The perimeter must be fully backfilled, with stone extended horizontally to the excavation wall.

Backfill of Chambers Embedment Stone and Cover Stone

Continue evenly backfilling between rows and around the perimeter until embedment stone reaches the tops of chambers and a minimum of 12″ (300 mm) of cover stone is in place. Perimeter stone must extend horizontally to the excavation wall for both straight or sloped sidewalls. The recommended backfill methods are with a stone conveyor outside of the bed or build as you go with an excavator inside the bed reaching along the rows. Backfilling while assembling chamber rows as shown in the picture will help to ensure that equipment reach is not exceeded.

Only after chambers have been backfilled to the top of the chamber and with a minimum 12″ (300 mm) of cover stone on top of chambers can skid loaders and small LGP dozers are used to final grade cover stone and backfill material in accordance with ground pressure limits in Table 2. Equipment must push material parallel to rows only. Never push perpendicular to rows. StormTech recommends the contractor inspect chamber rows before placing the final backfill. Any chambers damaged by construction equipment shall be removed and replaced.

Final Backfill of Chambers Fill Material

Install non-woven geotextile over stone. Geotextile must overlap 24″ (600 mm)where edges meet. Compact at 24″ (600 mm) of fil. Roller travel parallel with rows.

Inserta Tee Detail

Acceptable Fill Materials

Material Location| Description| AASHTO M43

Designation 1

| Compaction/Density Requirement
---|---|---|---
D Final Fill: Fill Material for layer ‘D’ starts from the top of the ‘C’ layer to the bottom of exible pavement or unpaved finished grade above. ote that the pavement subbase may be part of the ‘D’ layer.| Any soil rock materials, native soils or per engineer’s plans. Check plans for pavement subgrade requirements.|  A| Prepare per site design engineer’s plans. Paved installations may have stringent material and preparation requirements.
C Initial Fill: Fill Material for layer ‘C’ starts from the top of the embedment stone (‘B’ layer) to 24” (600 mm) above the top of the chamber. Note that pavement subbase may be part of the ‘C’ layer.| Granular well-graded

soil aggregate mixtures,

35% fines or processed aggregate. Most pavement subbase materials can be used in lieu of this layer.

| AA  145 A 1, A 2 4, A 3 or

AA    431 3, 357, 4, 467, 5, 56,

57, 6, 67, 68, 7, 78, 8,

89, 9, 10

| Begin compaction after min. 24” (600 mm) of material over the chambers is reached. Compact additional layers in 12″ (300 mm) max. lifts to a min. 95% Proctor density for well graded material and 95% relative density for processed aggregate materials.
B Embedment Stone: Fill the surrounding chambers from the foundation stone (‘A’ layer) to the ‘C’ layer above.| Clean, crushed, angular stone| AASHTO M431 3, 4| No compaction required.
A Foundation Stone: Fill below chambers from the subgrade up to the foot (bottom) of the chamber.| Clean, crushed, angular stone,| AASHTO M431 3, 4| Place and compact in 9” (230 mm) max lifts using two full coverages with a vibratory compactor.2, 3

Please Note:

1. The listed AASHTO designations are for gradations only. The stone must also be clean, crushed, and angular. For example, a specification for #4 stone would state: “clean, crushed, angular no. 4 (AASHTO M43) stone”
2. StormTech compaction requirements are met for ‘A’ location materials when placed and compacted in 9″ (230 mm) (max) lifts using two full coverages with a vibratory compactor
3. 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 the stomach for compaction requirements.

Inspection Port Detail

Fill Material Locations

Notes:

1. 36″ (900 mm) of stabilized cover materials over the chambers is recommended during the construction phase if general construction activities, Such as full dump truck travel and dumping, are to occur over the bed.
2. During paving operations, dump truck axle loads on 18″ (450mm) of cover for MC-3500s 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 18″ (450mm) of cover for MC-3500s 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 the 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. StormTech does not require compaction of initial fill at 18″ (450 mm) of cover. However, requirements by others for 6″ (150 mm) lifts may necessitate the use of small compactors at 18 (450 mm) of cover.
6. 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.
7. 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.

Maximum Allowable Construction Vehicle Loads6

Material Location

| Fill Depth over Chambers in. (mm)| Maximum Allowable Wheel Loads| Maximum Allowable Track Loads 6| Maximum Allowable Roller Loads
---|---|---|---|---
Max Axle Load for Trucks lbs (kN)| Max Wheel Load for Loaders

lbs (kN)

| Track Width in. (mm)| Max Ground Pressure psf (kPa)| Max Drum Weight or Dynamic Force lbs (kN)
D Final Fill Material| 36” (900)

Compacted

| 32,000 (142)| 16,000 (71)| 12″ (305)

18″ (457)

24″ (610)

| 4050 (194)

2760 (132)

2130 (102)

| 38,000 (169)
| | | | 30″ (762)| 1770 (84)|
| | | | 36″ (914)| 1530 (73)|
C Initial Fill Material| 24” (600)

Compacted

| 32,000 (142)| 16,000 (71)| 12″ (305)

18″ (457)

24″ (610)

| 2750 (131)

1920 (92)

1520 (73)

| 20,000 (89)
| | | | 30″ (762)| 1310 (63)|
| | | | 36″ (914)| 1180 (56)|
| 24” (600)|  C 3500| 12″ (305)

18″ (457)

24″ (610)

30″ (762)

36″ (914)

| 2430 (116)

1730 (82)

1390 (66)

1210 (58)

1100 (52)

| 16,000 (71)
|  oose umped| 32,000 (142)| 16,000 (71)
| |  C 4500
| | 24,000 (107)| 12,000 (53)
| 18″ (450)|  C 3500| 12″ (305)

18″ (457)

24″ (610)

30″ (762)

36″ (914)

| 2140 (102)

1530 (73)

1260 (60)

1120 (53)

1030 (49)

| 5,000 (22)

(static loads only)5

32,000 (142)| 16,000 (71)
| |  C 4500|
| | 24,000 (107)| 12,000 (53)|
B Embedment Stone| 12″ (300)| Not Allowed| Not Allowed| 12″ (305)

18″ (457)

24″ (610)

| 1100 (53)

710 (34)

660 (32)

| Not Allowed
| | | | 30″ (762)| 580 (28)|
| 6″ (150)| Not Allowed| Not Allowed| Not Allowed| Not Allowed| Not Allowed

Placement Methods and Descriptions

Material Location| Placement Methods/ Restrictions| Wheel Load Restrictions| Track Load Restrictions| Roller Load Restrictions
---|---|---|---|---
See Table 2 for Maximum Construction Loads
D Final Fill Material| A variety of placement methods may be used. All construction loads must not exceed the maximum limits in Table 2.| 36” (900 mm) minimum cover required for dump trucks to dump over chambers.| Dozers to push parallel to rows.4| Roller travel parallels to rows only until 36” (900 mm) compacted cover is reached.
C Initial Fill Material| Excavator positioned off bed recommended.

Small excavator allowed over chambers. Small dozer allowed.

| Asphalt can be dumped into the paver when the compacted pavement subbase reaches 24” (600 mm) above the top of the chambers.| Small LGP track dozers & skid loaders allowed grading cover stone with at least 12″ (300 mm) stone under tracks at all times. Equipment must push parallel to rows at all times.| Use the dynamic force of the roller only after the compacted fill depth reaches 24” (600 mm) over the chambers. Roller travel parallels to chamber rows only.
B Embedment Stone| No equipment is allowed on bare chambers. Use an excavator or stone conveyor positioned off the bed or on the foundation stone to evenly fill around all chambers to at least the top of the chambers.| No wheel loads allowed. The material must be placed outside the limits of the chamber bed.| No tracked equipment is allowed on chambers until a min. 12″ (300 mm) cover stone is in place.| No rollers allowed.
A Foundation Stone| No StormTech restrictions. Contractor is responsible for any conditions or requirements by others relative to subgrade bearing capacity, dewatering, or protection of subgrade.

Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com.

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 PLUS are registered trademarks of StormTech, Inc.

©2022 Advanced Drainage Systems, Inc. #10816 1/22 CS.

StormTech Installation Video:

Documents / Resources

| ADS MC-3500 StormTech Chamber and End Cap [pdf] Installation Guide
MC-3500 StormTech Chamber and End Cap, MC-3500, StormTech Chamber and End Cap, Chamber and End Cap, End Cap, Cap
---|---

References

• Advanced Drainage Systems - Pipe & Water Management Solutions

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