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185 1926.65l1p) OCCUPATIONAL SAFETY AND HEALTH STANDARDS AND INTERPRETATIONS accumulate in an excavatian. (v) In locatians where oxygen deficiency or gaseaus canditions are possible, air in the (q) If it is necessary to. place or ape rate power excav~tion shall be tested. Cantrols. as set shovels. derricks, trucks, materials, ar other torth in Subparts ,0 and E of this part shall heavy objects an a level above and near an be established to. assure acceptable ~tmos. excavation, the side of the excavatian shall pheric canditians. When flammable ~ases are be sheet-piled, shared, and braced as neces. p~esent, adequate ventilatian shall be pro- sary to resist the extra pressure due to. such vlded or sources of ignition shall be eliminated. superimposed loads. Attended emer~ncy rescue equipment. such as breathin5t apparatus, a safety harness and (r) Blasting and the use of explosives shall be line~ basket stretcher, etc., shall be readily performed in accardance with Subpart U af available where adverse atmospheric condi. this part. tians may exist or develop in an excavation. (I) When mobile equipment is utilized ar (w) Where employees or equipment are allawed adjacent to. excavatians, substantial required ar permitted to cross aver excava. stap lags ar barncades shall be instalted. If tians, walkways or bridltes with standard possible, the lTade shauld be away from the guardrails shall be provided. excavatian. (t) Adequate barrier physical protectian shan (x) Where ramps are used for emplayees or be provided at all remately located excava- equipment, they shalt be designed and tions. All wells, pits, shafts, etc., shall be canstructed by qualified persons in accord. barricaded ar cavered. Upon campletian at ex- ance with accepted engineering require. plaratian and similar aperatians, temporary menta. wells, pits, shafts, etc., shalt be backfilled. (u) It' possible, dust conditians shall be kept (y) All ladders used on excavatian operations to. a minimum by the use af water, salt, shalt be in accardance with the requirements calcium chlaride, ail, ar ather meane. af Subpart L of this part. 1926.652 - SPECIFfC~TRINCHrNG REQUIREMENTS (a) Banks mare than 5 feet -high shall be t/ (c) Sides of trenches in hard ar campact shared. laid back to a Itable Ilope.ar same sail, inc:luding embankments, shall be shored other equivalent mean. af proteetian shall ar otherwise supported when the trench is be pravided wheN employ... may be exposed more than 5 feet in depth and 8 teet ar more to mavine lI'Ound ar eav...ina. Refer to Table in length. In lieu ot sharing..the sides af the P-I as a cuide in IJapine at bank.. Trenches trench above the 5.faat level may be slaped less than 5 feet in depth shall alia be effec:. to. preclude callapse, but shall not be steeper tively protected when examinatian af the than a I.foot rise to each I/s.foot horizontal. graund indieatee hazardaus ground mave. When the autside diameter af a pipe is ment may be expected. gr.eater than 6 feet, a bench af 4-foot mini. mum shall be provided at the tae of the (Ia) Sides of trenches in unstable or saft slaped portian. material, 5 (eet ar mare in depth, shan be shared, sheeted, braced, slaped. ar atherwise (4) Materials used far sheeting and sheet supported by meane af sufticient strength to piling, bracing. sharing, and underpinning, protect the emplayees warking within them. shall be in goad serviceable condition, and See Tables P-I, P-2 (fallawing paragraph timbers used shan be saund and free from (g) af this seetian). large or loose knats, and shall be designed 1121.152(11) 182