Under OSHA 29 CFR 1926 Subpart AA, which three conditions must all be present for a space to be a confined space?
Safety Cfr
Question · Easy
Per OSHA 1926.651, excavated material and other equipment that could fall or roll into an excavation must be kept at least how far from the edge unless a retaining device is used?
OSHA 1926.651 requires a stairway, ladder, ramp, or other safe means of egress in trench excavations that are 4 feet or more in depth so that employees travel no more than how far laterally to reach it?
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Under OSHA 1926.652, employees in an excavation generally must be protected from cave-ins by a protective system when the excavation is how deep, unless it is entirely in stable rock?
Question · Medium
When testing the atmosphere of a permit-required confined space under OSHA 1926 Subpart AA, what is the required order of tests with a calibrated direct-reading instrument?
For excavations less than 20 feet deep, what is the maximum allowable simple slope in Type C soil under OSHA 1926 Subpart P Appendix B?
A plant wet well is large enough to enter, has a ladder as the only access, and is not designed for occupancy. Which additional condition makes it a permit-required confined space under OSHA 1926.1202?
Which statement about OSHA excavation protective systems is correct?
Question · Hard
Who is required to notify South Carolina 811 before beginning excavation on a water or sewer plant site?
General Plant Construction
Under the APWA Uniform Color Code used by SC811 locators, which colors mark potable water and sanitary sewer?
Why are waterstops installed in construction joints of cast-in-place water and wastewater process tanks?
According to the DIPRA Installation Guide, how should push-on joint ductile iron pipe normally be laid?
What is the standard method DIPRA and ANSI/AWWA C105 specify for external corrosion protection of ductile iron pipe in most corrosive soils?
A contractor is setting a submersible pump in a newly constructed plant wet well. How should the wet well be treated for worker entry?
Per the DIPRA Installation Guide, why are bell holes excavated at each ductile iron pipe joint?
On buried ductile iron plant yard piping, where is a concrete thrust block typically required?
After a pump or clarifier drive is set on its anchor bolts and aligned, what is the usual next step before final bolt tightening?
According to DIPRA, where are flanged ductile iron joints most commonly used?
The South Carolina Water and Sewer Plants contractor classification is intended to cover which scope of work?
For a normal SC811 locate request, how long do facility operators have to respond before the excavator may begin work?
What is the SC811 tolerance zone for ordinary land excavation around a marked underground facility?
Per DIPRA Table 2, what is the suggested trench width for 12-inch ductile iron pipe?
DIPRA and ANSI/AWWA C600 recommend hydrostatic testing of a newly installed ductile iron pressure main at not less than which pressure and duration at the lowest elevation of the test section?
When a ductile iron trench is excavated in rock, how much clearance does DIPRA require between the rock and the pipe for diameters up to 24 inches?
What minimum earth cover over water mains does DIPRA generally describe as desirable to cushion traffic shock where frost is not the controlling factor?
When assembling a mechanical joint, DIPRA requires bolts to be tightened in which pattern?
Where should a PVC or rubber dumbbell waterstop be located in a tank wall construction joint?
After formwork is stripped from a process-tank wall, how should through-wall form-tie holes be treated?
What is the preferred way to take a pressure pipe through a cast-in-place tank wall so the penetration stays watertight?
Before placing a cast-in-place tank floor slab, what must be done about water in the excavation?
How should cast-in-place anchor bolts for plant equipment typically be held during the concrete pour?
Before mechanized excavation begins on a South Carolina plant site, what must the excavator verify in addition to waiting the required time?
Why might underground piping on a water or sewer plant site remain unmarked after a valid SC811 ticket?
How does DIPRA recommend stringing ductile iron pipe along the trench before installation?
For isolation of indoor plant process piping, which valve type is most commonly selected when a visible rising stem and a tight shutoff are required?
How is a newly completed concrete process tank typically tested for watertightness?
When backfilling around a tall cast-in-place tank wall, what practice prevents unbalanced lateral load on the wall?
Why must clarifier effluent weirs and launders be set to the elevations and levelness shown on the plant drawings?
When installing a filter underdrain system on a plant filter floor, what is the contractor's primary construction responsibility?
Per DIPRA, when a push-on or mechanical joint must be deflected to follow alignment, when is the deflection made?
A 12-inch ductile iron plant yard main has a working pressure of 100 psi. In accordance with ANSI/AWWA C600 as cited by DIPRA, which statement about the hydrostatic test is correct?
Per DIPRA Table 2, what is the suggested trench width for 8-inch ductile iron pipe?
The unbalanced hydrostatic thrust at a 90-degree bend is most nearly which multiple of pressure times the internal cross-sectional area (P × A)?
Per DIPRA Table 4, what is the specified bolt-torque range for mechanical joints on 4-inch through 24-inch pipe?
ANSI/AWWA C105 Method A polyethylene encasement uses which installation approach?
How should PVC waterstop splices in a process-tank joint be made?
A pump is set on leveling nuts, aligned, and ready for grout. Which sequence is correct?
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