Safety Quiz #4

If the competent person onsite identifies a hazard that is present in trench excavation, and there are people working in the trench....

He/she has the authority to take immediate action to order the workers out of the excavation area, whether the workers are employed by his/her company or not.

If we see someone using an extension ladder to access a roof level 24' in height, what is the right distance for the bottom of the ladder to be from the face of the wall?

-6'-0"

What is the minimum dimension the top of a trench box/shield must be above the top of an excavation?

-A minimum of 18" above the top of the excavation

Planks on the end of a scaffold should extend past the support at least ...... Inches, unless they are nailed/cleated/secured

-........6 inches

If there is a change in elevation greater than..... inches, then a stairway, ladder or ramp must be in place, according to sub-part.....

-19 inches -Sub-part X

Regarding the OSHA fall protection video shown in class on November 1st, briefly describe any of the key takeaways we discussed in class during the de-briefing after the video.

-Always make sure your safety harness is attached correctly, and make sure to check it before use.

Cross braces on a frame scaffold system may be used as a ladder for accessing upper platforms so long as they are installed correctly.

-False

If a particular soil has been classified as a type C granular sandy soil, with compressive strength on the order of .4tons/sf, and has an optimal moisture content, we can employ a sloping protection of 1:1 ratio and be compliant by OSHA standards?

-False

Under no circumstances can cross braces be used as either a mid-rail or a guardrail on frame scaffold.

-False

Besides the risk of a Cave-in name (2) of the additional hazards associated with excavation and trenching activities?

-Lack of oxygen in trench -Electrical wires over excavation -Toxic substances in the trench

If an employee is standing on an extension ladder, and performing work, at a height of 20' or less, does the employee need to have fall protection?

-No

For a height of 8 stories what is the maximum distance a scaffold is to be from the face of the wall?

-No more than 14"

Which of the following best offers the definition of a trench excavation:

-The depth of the excavation is greater than width, and the width is less than 15 feet.

In determining the acceptability of a temporary stairway, which of the following criteria is in violation of osha requirements?

-The stairway has a top landing area of 24" deep at the top

With an OSHA complaint "Controlled Access Zone," workers would be allowed inside such a zone without a fall arrest system, but only if there is a properly trained supervisor watching over there work.

-True

When planning an excavation of 20 feet or less in depth, there are three primary types of protection measures we can employ to keep workers safe. Please fill the blanks?

Shielding, sloping, shoring