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Acceptable Fill Materials

Acceptable Fill

SC-Series

  Material Location Description AASHTO M43 Designation (1) Compaction/ Density Requirement
D Fill material for layer D starts from the top of layer C to the bottom of flexible pavement or unpaved finish grade above. Note that pavement sub-base may be part of the D layer. Any soil/rock materials, native soils, or per engineer's plans. Check plans for pavement subgrade requirements. N/A Prepare per engineer's plans. Paved installations may have stringent material and preparation requirements.
C Fill material for layer C starts from the embedment stone (B layer) to 18" (457 mm) above the top of the chamber. Note that pavement sub-base may be part of the C layer. Granular well-graded soil/aggregate mixtures, <35% fines. Most pavement sub-base materials can be used in lieu of this layer. 3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 Begin compaction after 12" (305 mm) of material over the chambers is reached. Compact additional layers in 6" (152 mm) lifts to a minimum 95% standard proctor density. (2) Roller gross vehicle weight not to exceed 12,000 lbs. (53 kN). Dynamic force not to exceed 20,000 lbs. (89 kN).
B Embedment stone surrounding chambers from the foundation stone to the C layer above. Clean, crushed, angular stone, nominal size distribution between 3/4" - 2" (19 mm -51 mm) 3, 357, 4, 467, 5, 56, 57 No compaction required.
A Foundation stone below chambers from subgrade up to the foot (bottom) of the chamber. Clean, crushed, angular stone, nominal size distribution between 3/4" - 2" (19 mm - 51 mm) 3, 357, 4, 467, 5, 56, 57 Plate compact or roll to achieve a 95% standard proctor density.(2)

Please note:

1. 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."

2. As an alternative to proctor testing and field density measurements in the 'A' location, StormTech compaction requirements are met for 'A' location materials when placed and compacted in 9" (229) (max) lifts using two full passes with an appropriate compactor.

MC-Series

  Material Location Description AASHTO M43 Designation (1) Compaction/ Density Requirement
D Fill material for layer D starts from the top of layer C to the bottom of flexible pavement or unpaved finish grade above. Note that pavement sub-base may be part of the D layer Any soil/rock materials, native soils, or per engineer's plans. Check plans for pavement subgrade requirements. N/A Prepare per engineer's plans. Paved installations may have stringent material and preparation requirements
C Fill material for layer C starts from the embedment stone (B layer) to 24" (610 mm) above the top of the chamber. Note that pavement sub-base may be part of the C layer. Granular well-graded soil/aggregate mixtures, <35% fines. Most pavement sub-base materials can be used in lieu of this layer. (AASHTO M145 A-1, A-2, A-3) 3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 Begin compaction after min 24" (610 mm) of material over the chambers is reached. Compact additional layers in 12" (305 mm) lifts to a minimum 95% standard proctor density. (see Tables 2 and 3 of the MC-3500 / MC4500 Construction Guide for maximum roller loads)
B Embedment stone surrounding chambers from the foundation stone to the C layer above. Clean, crushed, angular stone 3, 4, #57 for MC-3500 only No compaction required.
A Foundation stone below chambers from subgrade up to the foot (bottom) of the chamber. Clean, crushed, angular stone 3, 4, #57 for MC-3500 only Plate compact or roll to achieve a 95% standard proctor density.(2)

 

Please note:

1. 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."

2. As an alternative to proctor testing and field density measurements in the 'A' location, StormTech compaction requirements are met for 'A' location materials when placed and compacted in 9" (229) (max) lifts using two full passes with an appropriate compactor.

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