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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX F<br />

distances that heavier equipment may be placed from the edge so as to prevent collapse of the<br />

excavation wall caused by the weight of the equipment.<br />

Scaling or barricades shall be used to prevent rock and soils from falling on employees.<br />

Excavated and loose materials should be kept at least three ft from the edge of excavations,<br />

but at a minimum of two ft from the edge of the excavation in accordance with OSHA<br />

requirements.<br />

Walkways or bridges with standard railing shall be provided at points employees are to cross<br />

over excavations or trenches.<br />

Barriers shall be provided to prevent personnel from inadvertently falling into an excavation.<br />

Workers within two ft of the edge of the excavation must be protected by fall protection.<br />

4.5.11.1 Hazardous Atmospheres<br />

Where atmospheres containing less than 19.5 percent oxygen or other types of hazardous atmospheres<br />

may exist the following requirements shall be implemented.<br />

Atmospheric testing shall be done prior to employees entering excavations four ft or greater<br />

in depth.<br />

Testing methods shall be listed on the daily inspection checklist and results documented daily<br />

in field logs.<br />

Control measures such as ventilation and PPE shall be used to control employee exposure to<br />

hazardous atmospheres below published exposure limits.<br />

Ventilation shall be used to control flammable and combustible vapors to below 10 percent of<br />

their lower explosive limit.<br />

Testing shall be repeated as often as necessary to ensure safe levels of airborne contaminants.<br />

Emergency equipment shall be provided and attended when the potential for a hazardous<br />

atmosphere exists. This equipment shall include but not be limited to emergency breathing<br />

apparatus, harnesses, lifelines, and basket stretchers. Required equipment will be listed on the<br />

daily inspection checklist and reviewed daily.<br />

4.5.11.2 Protection From Water Hazards<br />

When water has collected or is collected in excavations and trenches the following requirements shall be<br />

applied.<br />

Employees shall not work in excavations in which water has, or is, accumulating without the<br />

use of additional protection such as special support systems or water removal.<br />

Water removal shall be monitored by a competent person.<br />

Barriers such as ditches and dikes shall be used to divert runoff from excavations and<br />

trenches.<br />

Kirtland AFB<br />

Base-Wide Health and Safety Plan F-43 April 2004

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