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Cisco Sarmiento Phoenix Division 602-253-3311. OSHA Subpart P Excavations. Applies to all open excavations including trenches, pits, shafts, and other cuts made in the earth’s surface.

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Cisco Sarmiento

Phoenix Division

602-253-3311


Osha subpart p excavations l.jpg
OSHA Subpart P Excavations

Applies to all open excavations including trenches, pits, shafts, and other cuts made in the earth’s surface.

It does not matter if an excavation is created with an excavator, backhoe, dozer, drill, trencher, shovel, etc.

If excavating you MUST have a competent person in excavation safety


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OSHA Investigated Trench Related Fatalities

(1985-2007)

68

67

61

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53

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Definition cave in l.jpg
Definition: Cave-in

Separation of a mass of soil or rock from the side of an excavation.


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Weight of Soil

One cubic foot (12”x 12”x 12”) weighs between 90 to 140 pounds.

One cubic yard (36”x 36”x 36”) weighs as much as a small pickup truck.

12”

ONE

CUBIC FT.

12”

12”


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Competent Person

  • Means one who is capable of identifying existing and predictable hazards in the surroundings, or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has the authorization to take prompt corrective measure to eliminate them.


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Competent PersonAs applied to excavations the CP must:

  • Be knowledgeable about the excavations standard

  • Be capable of identifying hazards

  • Have the authority to take immediate action

  • Know how to classify soil type

  • Know how to select and use shoring, shields, and/or sloping


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Inspections – Worker Exposure

Excavations, adjacent areas, and protective systems must be inspected by a competent person:

  • Daily – prior to work

  • As needed during work

  • After rainstorm or other hazard increasing occurrence

  • Where hazards are identified corrective action must be implemented.

    Always document inspections.


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Soil Classification

The competent person must make at least one visual and one manual soil test as a basis for soil classification.

Unless the soil is considered to be 'Type C' and treated as a 'C'


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Every employee working in a trench or excavation over 5 feet deep must be protected from a cave-in by a protective system:

  • Sloping or Benching walls

  • Shoring to support walls

  • Shields to protect occupants inside when walls cave-in


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Sloping and Benching

  • When sloping or benching refer to the standard;

    • Type A Soil ¾ : 1

    • Type B Soil 1 : 1

    • Type C Soil 1 ½ : 1

  • Type C Soil can not be benched



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Hydraulic Shoring

  • Read tabulated data for each installation

    • Spacing between shores changes based on widths and depths of trench

  • No more than four feet from bottom cylinder to bottom of trench or 2’ from bottom of board to bottom of trench

  • Some Tabulated Data Sheets State that a complete system is working between 2 pressurized shores. “BE CAREFULL”


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Horizontal Spacing

Figure No. 1

Vertical Aluminum

Hydraulic Shoring

(Spot Bracing)

Vertical Rail

18” Max.

Vertical

Spacing

Hydraulic Cylinder

4’ Max. Clyn

OR

2’ Max. Board


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Trench Boxes

  • Can be lifted 2’ up from the bottom of trench as long as the box is rated for entire depth of trench.

  • Trench box must extend 18” above a slope

  • Must be installed to prevent lateral movement in the box

  • Used to the rated Depth!

  • Never inside the box when being moved vertically


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Tabulated data must be available at the jobsite during construction, setup, and removal of protective systems

Serial # of shield

Model # of shield

Soil type

Max. depth

Limitations

Soil description

Must be certified by RPE


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When the excavation walls at the ends of the trench shield are not sloped they must be shielded as suggested by the manufacturer.


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Too many times the trench is not protected correctly are not sloped they must be shielded as suggested by the manufacturer.….


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Access and Egress are not sloped they must be shielded as suggested by the manufacturer.In trenches 4’ or more in depth there must be at least one safe way to get in and out of excavations within 25 feet of each worker.

Less than 25 ft.

Less than 25 ft.

>4'


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Ladders must extend 36 inches above the point of access. are not sloped they must be shielded as suggested by the manufacturer.

36”


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How many ladders? are not sloped they must be shielded as suggested by the manufacturer.

------------------ 100’ ----------------------

25’

25’

25’

25’

Exposed Trench


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Spoil Pile are not sloped they must be shielded as suggested by the manufacturer.

Spoil pile

MIN.

2’

Spoil piles, materials, and equipment must be set back at least 2 feet from the edge of the excavation.


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Underground Installations are not sloped they must be shielded as suggested by the manufacturer.

  • Must be located prior to digging

  • Determine the utilities exact location by hand digging or vacuum excavating only!

  • Support, protect, or remove utilities in open excavations

  • Contact utility company or facility owner if help


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Water = Cave-in Hazard are not sloped they must be shielded as suggested by the manufacturer.

These workers must be protected from cave-in. Note the water in the bottom of the trench. This is a very hazardous condition!


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Hazardous Atmospheres are not sloped they must be shielded as suggested by the manufacturer.

Trenches over

4’ Deep can

be considered

a confined space

if hazardous

atmosphere is

present!


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Surface Utilities are not sloped they must be shielded as suggested by the manufacturer.

Must be removed or supported


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Workers must be provided with and wear warning vests or highly visible clothing when exposed to traffic.

Exposure To Vehicle Traffic


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Subpart P - Excavations highly visible clothing when exposed to traffic

(1926.650 - 652)

Employee protection in excavations - Protective system use

Egress from trench

Inspections by competent person

Protection from falling/rolling materials

Competent person inspection - Employees removed from hazard

Number of Serious Violations - FY 2009


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Remember! highly visible clothing when exposed to traffic

  • Workers must be protected at all times

  • Excavations 5 feet or more in depth must be sloped, shored, or shielded

  • Excavations less than 5 feet deep must be evaluated by the competent person

  • Read tabulated data on your shoring systems

  • Access and egress for all employees in trench 4’ or more in depth

  • Have a Competent Person on site!

  • Get trained today protect your company and your employees!

    Classes held by TUCA, ACT, ABA



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NATIONAL UTILITY “Competent Person” is?CONTRACTORS ASSOCIATION

TRAINING

AVAILABLE THROUGH:

N.U.C.A.

  • National Utility Contractors

  • Association of Arizona

  • (623) 582-6822


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