ExcAVATIONs

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Hazardous atmospheres Hazardous atmospheres can occur in excavations near landfills, sites contaminated by leaking gas lines or storage tanks, in sewers, and in other confined spaces. If these conditions are possible, a competent person must test for oxygen deficiency (oxygen levels less than 19.5 percent) and hazardous atmospheres before you can enter. 20
Water accumulation Water makes soil unstable. You can’t enter an excavation when water has built up unless you are protected from the unstable soil. Protection includes specialized support systems and water-removal equipment. A competent person must inspect the excavation and monitor methods used to control water accumulation. 21
Page 1 and 2: Exca v ations Safe practices for sm
Page 3 and 4: About this document Excavations - S
Page 5 and 6: Introduction A cave-in can trap you
Page 7 and 8: What is a trench? A trench is deepe
Page 9 and 10: The role of the competent person A
Page 11 and 12: Soil and stability Some soils are m
Page 13 and 14: Manual tests Manual testing involve
Page 15 and 16: What do benched slopes look like in
Page 17 and 18: What do shores and shields look lik
Page 19: Materials and mobile equipment Exca
Page 23 and 24: Where do I post the warning signs?
Page 25 and 26: • Never use damaged chains or fra
Page 27 and 28: Stability and adjacent structures M
Page 29 and 30: Safe practices checklist All your a
Page 31 and 32: 16. Underground installations are p
Page 33 and 34: 35. Appropriate sloping, shoring, o
Page 35 and 36: Registered professional engineer A
Page 37 and 38: Notes 37
Page 40: 440-2174 (4/09) OR-OSHA

ExcAVATIONs

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