Under OSHA 29 CFR 1926 Subpart P, when must a trench generally have a protective system such as sloping, shoring, or shielding?
Excavation
Question · Medium
How deep before you need a trench box?
Short
In a trench excavation 4 ft or more deep, OSHA requires a safe means of egress so that workers need no more than what lateral travel distance to a ladder, stairway, or ramp?
OSHA requires excavated spoil and other materials to be kept at least how far from the edge of an excavation unless a retaining device is used?
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Who must perform daily inspections of excavations, adjacent areas, and protective systems before workers enter?
Question · Easy
For excavations 20 ft deep or greater, protective systems must generally be designed or approved by which party?
Question · Hard
Lockout/tagout, called like a cup final
Before excavating for underground tanks or product lines in Alabama, what is the primary purpose of contacting Alabama 1 Call (811)?
According to common PEI RP100 practice for UST installations, the bottom of the excavation should typically be covered with bedding backfill to a depth of at least:
Why must the excavation for an underground storage tank be large enough to provide adequate clear space around the tank shell?
What is a primary reason to avoid using native clay clods, frozen soil, or large rocks as primary tank backfill around a UST?
During UST excavation near an existing building foundation, what is a critical site-protection concern under NFPA 30 tank location principles?
Under traditional NFPA 30 underground tank spacing concepts, the distance from any part of a Class I liquid tank to the nearest wall of a basement or pit should be not less than:
For a Class I liquid underground tank, NFPA 30 generally requires not less than what distance to a property line that can be built upon?
When placing an underground tank, why should the tank never be rolled or dropped into the excavation?
In high groundwater or flood-prone sites, what excavation/installation issue must be specifically controlled for empty or partially empty USTs?
OSHA soil classification for excavations divides soils primarily into which groups used to select sloping and shoring?
Which OSHA soil type is generally the least stable and requires the flattest maximum allowable slopes when sloping is used?
What is the main purpose of using filter fabric between approved tank backfill and native soil in a UST excavation?
Before workers enter a deep tank excavation where a hazardous atmosphere could exist, what should be done?
When installing multiple adjacent underground tanks, why is spacing between tanks important during excavation layout?
What is a key reason to dewater a UST excavation in a controlled manner rather than allowing rapid groundwater inflow during installation?
For product piping trenches, a common good practice is to provide clean bedding under the pipe and sufficient cover over the pipe. Why is uniform support under the pipe critical?
If buried utilities are marked after a One Call request, what is the excavator's responsibility when digging near the marks?
What condition after a rainstorm should cause a competent person to reinspect an open tank excavation before workers re-enter?
Why should mechanical compactors be used carefully when compacting backfill near a UST shell?
When excavating to remove or replace an old underground tank, what is an essential safety practice before hot work or cutting on the tank?
What is the purpose of sloping or benching an excavation wall according to OSHA soil type?
A trench shield (trench box) protects workers primarily by:
Why must underground tank excavations account for the tank manufacturer's maximum burial depth?
When installing hold-down straps for buoyancy control, what installation practice helps protect the tank?
What is the best description of a "competent person" for excavation work on a gas and oil project?
During layout of a UST system, why should the excavation plan coordinate tank elevation with finished grade and pavement section?
If a UST excavation will be left open overnight, what is an appropriate control?
Under NFPA 30 classification concepts, a liquid with a closed-cup flash point below 100°F is generally classified as:
Tank Installation Testing
A combustible liquid with a flash point at or above 100°F and below 140°F is Class:
Shop-fabricated steel underground storage tanks are commonly listed to which UL standard?
According to OSHA/NFPA-style underground tank cover rules often tested for Class liquid tanks, minimum cover in non-traffic areas is commonly:
Where underground tanks are subject to traffic, a common code-level cover option is:
What is the primary purpose of normal (operating) vents on a flammable liquid storage tank?
Emergency relief venting on aboveground tanks is primarily intended to:
For underground tanks storing Class I liquids, vent pipes typically must discharge:
What is the main purpose of overfill prevention equipment on a UST?
Secondary containment for tanks is intended to:
Aboveground storage tanks for motor fuel commonly require diking or other secondary containment sized to hold:
What is a primary purpose of a pre-installation tank tightness or air/soap test on a new UST before backfill is completed?
When air-testing a tank, why must pressure be limited to the manufacturer's specified test pressure?
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