Per 29 CFR 1926.651, a stairway, ladder, ramp, or other safe means of egress is required in a trench excavation once the trench reaches what minimum depth?
Safety Cfr
Question · Easy
Unless a retaining device is used, excavated spoil and other materials that could roll into a trench must be kept at least how far from the edge of the excavation?
Under 29 CFR 1926 Subpart P, which statement best describes a competent person for excavation work?
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Per 29 CFR 1926.652, employees in an excavation generally must be protected by a sloping, shoring, or shielding system once the excavation is how deep, unless it is entirely in stable rock?
Question · Medium
A cohesive clay has an unconfined compressive strength of 1.8 tsf. The same soil was previously excavated and backfilled. How must it be classified under OSHA Subpart P Appendix A?
For a simple slope excavation 20 feet or less in Type C soil, what is the maximum allowable slope in OSHA Subpart P Appendix B?
A sewer trench will be 8 feet deep in Type C soil and sloped on both sides at the OSHA Appendix B maximum of 1½:1. How much horizontal setback is required on each side from the bottom of the cut to the top of the slope?
Question · Hard
When employees will be exposed, how often must a competent person inspect an excavation, the adjacent areas, and protective systems?
Where an oxygen-deficient or other hazardous atmosphere exists or could reasonably be expected, the atmosphere in an excavation must be tested before employees enter once the excavation is greater than what depth?
While a backhoe is placing concrete pipe, where may employees stand?
Employees exposed to public vehicular traffic at an excavation must be provided with and wear which of the following?
If water-removal equipment is used to control water accumulating in a sewer trench, who must monitor the equipment and operations?
A sewer excavation will be 24 feet deep. Which statement about protective-system design is correct under 29 CFR 1926 Subpart P?
Under 29 CFR 1926.650, a trench is generally a narrow excavation whose depth is greater than its width and whose width at the bottom is not greater than:
What is the maximum allowable simple slope for Type A soil in an excavation 20 feet or less deep, per OSHA Appendix B?
Which protective method is not permitted in Type C soil under OSHA Subpart P Appendix B?
Walkways must be provided where employees or equipment cross over excavations. Guardrails complying with 29 CFR 1926.502(b) are required when those walkways are how far above a lower level?
What is the primary difference between a trench shield (trench box) and a shoring system?
When laying bell-and-spigot concrete sewer pipe on grade, which way should the bell (socket) face?
Underground Utilities Concrete Pipe
Line and grade for a gravity concrete sewer are set from which pipe surface?
A 400-foot run of concrete gravity sewer has an upstream invert of 100.00 feet and a downstream invert of 98.00 feet. What is the slope of the line?
The upstream invert of a concrete sewer is 105.50 feet. The run is 250 feet at a design slope of 0.40 percent. What is the downstream invert?
In a concrete-pipe trench installation, which zone of soil support is most critical for carrying load around the pipe?
After a concrete sewer pipe with lift holes is set on grade, what should be done with the lift holes?
Modern reinforced concrete gravity sewer pipe is most commonly joined with which joint type?
According to the DIPRA installation guide, polyethylene encasement is placed on ductile iron pipe primarily to:
When a trench box is used during concrete-pipe installation, what is the correct practice as backfill proceeds?
Per ACPA standard-installation guidance, if a concrete pipe is founded on rock rather than soil, the bedding thickness should be:
Traditional Class B bedding for circular concrete pipe generally provides support by:
The most reliable field method for holding invert grade on a long concrete gravity sewer is to:
A 350-foot concrete sewer is designed at 0.40 percent. How much invert drop should there be from the upstream manhole to the downstream manhole?
A rubber-gasketed concrete pipe joint is correctly assembled when:
Reinforced concrete pipe (RCP) is most often selected for which A-15 application?
Trench width for concrete pipe should be:
A sewer is laid on a grade of 1/8 inch per foot. What percent slope is that?
After concrete pipe is homed on grade, the first backfill placed against the pipe should be:
Sanitary sewer joints on concrete pipe must be watertight primarily to:
Before concrete sewer pipe is laid, standing water in the trench bottom should be:
A rectangular sewer trench is 120 feet long, 4 feet wide, and 8 feet deep. What is the excavated volume in cubic yards (bank measure)?
Excavating And Grading
Estimate the bank volume of a trench 200 feet long, 3 feet wide, and 6 feet average depth.
A sewer trench yields 80 cubic yards of bank soil. If the soil swells 25 percent when loaded, how many loose cubic yards must be hauled?
Offset grade hubs for a sewer trench are typically used to:
The correct sequence for a typical gravity sewer trench is:
Final trench backfill above the pipe zone should be placed:
A 3-foot-wide trench bottom is 10 feet deep in Type C soil and will be sloped 1½:1 on both sides (no benching). What is the approximate width at the top of the cut?
If the trench bottom is soft, pumping, or yielding underfoot, the pipe-layer should first:
Finish grade along a sewer easement after backfill should generally:
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