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Trench Collapse


Quiz Questions

1. What was the I-95 Miami rehabilitation project?
Installation of new streetlights in Miami
Replacement of asphalt shoulder pavement with full depth concrete shoulder pavement
Replacement of concrete pavement in downtown Miami
2. What did the project also include besides the pavement replacement?
Drainage modifications and new concrete barrier walls in the center median of the I-95
Installation of new streetlights along the I-95
Replacement of old guardrails on the I-95
3. What did the project involve?
Replacement of all concrete pavement in the established project limits
Installation of new drainage systems along the I-95
Installation of new asphalt shoulder pavement
Removal and replacement of concrete pavement within the established project limits
4. What does this image represent?

ADA- trench collapse 1
Section of the barrier wall prior to collapse
Section of the excavation prior to the collapse
5.

What happened after Archer Western installed the buried drainage pipe involved in the incident?

The pipe was found to be perfectly installed
The pipe was found to be too small for the drainage needs
The pipe was found to be damaged during construction or mis-installed
6. How deep was the trench that Archer Western had its employees’ hand-dig?
Approximately 130 feet deep
Approximately three feet wide
Approximately two feet deep
7.

What was the size of the concrete barrier wall involved in the incident?
Approximately 100 feet long
Approximately 121 feet long
Approximately 130 feet long
8. What was the cause of the failure?
The instability of the subgrade soil
Heavy rainfalls
The instability of the concrete barrier wall
9. What type of soil was the excavated soil classified as during the site visit?
Type A soil
Type D soil
Type A soil
Type C soil
10.

What was the Archer Western’s violation of OSHA standards?
Violation of CFR 1926.651(k)(1) by conducting inspection of the excavation and adjacent areas
Violation of CFR 1926.651(i)(1) by not providing a support system to ensure stability of the concrete barrier wall
Violation of CFR 1926.651(i)(2) by providing a support system that was not adequate

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