ADS StormTech DC-780, Design Manual

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36

15.0 Chamber Specifications for Contract Documents

•  To ensure a secure joint during installation and backfill, the 

height of the chamber joint shall not be less than 2”.

• 

To ensure the integrity of the arch shape during 

installation, a) the arch stiffness constant as defined in 

Section 6.2.8 of ASTM F2418 shall be greater than or 

equal to 550 lbs/in/in. And b) to resist softening during hot, 

sunny installation conditions, chambers shall be produced 

from light, reflective gold or yellow colors.

8.  Only chambers that are approved by the site design engineer 

will be allowed. The chamber manufacturer shall submit 

the following upon request to the site design engineer for 

approval before delivering chambers to the project site:
•  A structural evaluation sealed by a registered professional 

engineer that demonstrates that the safety factors are 

greater than or equal to 1.95 for dead load and 1.75 for 

live load, the minimum required by ASTM F2787 and by 

AASHTO for thermoplastic pipe.

•  A structural evaluation sealed by a registered professional 

engineer that demonstrates that the load factors specified 

in the AASHTO LRDF bridge design specifications, 

Section 12.12, are met. The 50 year creep modulus 

data specified in ASTM F2418 must be used as part of 

the AASHTO structural evaluation to verify long-term 

performance.

Chambers and end caps shall be produced at an ISO 9001 

certified manufacturing facility.

•  To ensure a secure joint during installation and backfill, the 

height of the chamber joint shall not be less than 2”.

• 

To ensure the integrity of the arch shape during 

installation, a) the arch stiffness constant as defined in 

Section 6.2.8 of ASTM F2418 shall be greater than or 

equal to 550 lbs/in/in. And b) to resist softening during hot, 

sunny installation conditions, chambers shall be produced 

from light, reflective gold or yellow colors.

8.  Only chambers that are approved by the site design engineer 

will be allowed. The chamber manufacturer shall submit 

the following upon request to the site design engineer for 

approval before delivering chambers to the project site:
•  A structural evaluation sealed by a registered professional 

engineer that demonstrates that the safety factors are 

greater than or equal to 1.95 for dead load and 1.75 for 

live load, the minimum required by ASTM F2787 and by 

AASHTO for thermoplastic pipe.

•  A structural evaluation sealed by a registered professional 

engineer that demonstrates that the load factors specified 

in the AASHTO LRFD bridge design specifications, 

Section 12.12, are met. The 50 year creep modulus 

data specified in ASTM F2418 must be used as part of 

the AASHTO structural evaluation to verify long-term 

performance.

Chambers and end caps shall be produced at an ISO 9001 

certified manufacturing facility.

SC-740 STORMTECH CHAMBER SPECIFICATIONS

1. 

Chambers shall be Stormtech SC-740.

2.  Chambers shall be arch-shaped and shall be manufactured 

from virgin, impact-modified polypropylene copolymers.

3. 

Chambers shall meet the requirements of ASTM F2418-16A, 

“Standard Specification for Polypropylene (PP) Corrugated 

Wall Stormwater Collection Chambers”

4. 

Chamber rows shall provide continuous, unobstructed 

internal space with no internal supports that would impede 

flow or limit access for inspection.

5.  The structural design of the chambers, the structural backfill, 

and the installation requirements shall ensure that the 

load factors specified in the AASHTO LRFD bridge design 

specifications, Section 12.12, are met for: 1) long-duration 

dead loads and 2) short-duration live loads, based on the 

AASHTO design truck with consideration for impact and 

multiple vehicle presences.

6. 

Chambers shall be designed, tested and allowable load 

configurations determined in accordance with ASTM F2787, 

“Standard practice for structural design of Thermoplastic 

Corrugated Wall Stormwater Collection Chambers”.  Load 

configurations shall include: 1) instantaneous (<1 min) 

AASHTO design truck live load on minimum cover 2) 

maximum permanent (75-yr) cover load and 3) allowable 

cover with parked (1-week)  AASHTO design truck.

7.  Requirements for handling and installation:

•  To maintain the width of chambers during shipping and 

handling, chambers shall have integral, interlocking 

stacking lugs.

DC-780 STORMTECH CHAMBER SPECIFICATIONS

1. 

Chambers shall be Stormtech DC-780.

2.  Chambers shall be arch-shaped and shall be manufactured 

from virgin, impact-modified polypropylene copolymers.

3. 

Chambers shall meet the requirements of ASTM F2418-16A, 

“Standard Specification for Polypropylene (PP) Corrugated 

Wall Stormwater Collection Chambers”

4. 

Chamber rows shall provide continuous, unobstructed 

internal space with no internal supports that would impede 

flow or limit access for inspection.

5.  The structural design of the chambers, the structural backfill, 

and the installation requirements shall ensure that the 

load factors specified in the AASHTO LRFD bridge design 

specifications, Section 12.12, are met for: 1) long-duration 

dead loads and 2) short-duration live loads, based on the 

AASHTO design truck with consideration for impact and 

multiple vehicle presences.

6. 

Chambers shall be designed, tested and allowable load 

configurations determined in accordance with ASTM F2787, 

“Standard Practice for Structural Design of Thermoplastic 

Corrugated Wall Stormwater Collection Chambers”.  Load 

configurations shall include: 1) instantaneous (<1 min) 

AASHTO design truck live load on minimum cover 2) 

maximum permanent (75-yr) cover load and 3) allowable 

cover with parked (1-week)  AASHTO design truck.

7.  Requirements for handling and installation:

•  To maintain the width of chambers during shipping and 

handling, chambers shall have integral, interlocking 

stacking lugs.