for relocation of underground utilities

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- (a) cutting back the walls of the excavation to reduce the height of the remaining vertical walls, if any, to no more than 1.5 metres for 'hard and compact soil' and 'likely to crack or crumble soil', - (b) installing temporary protective structures, or - (c) using a combination of the methods in clauses (a) and (b). 450 (2) Subsection (1) does not apply if a trench is constructed in solid rock throughout the entire trench. ## Cutting back walls - 451 If the walls of an excavation are cut back, an employer must ensure that - (a) if the soil is classified as 'hard and compact soil', the walls are sloped to within 1.5 metres of the bottom of the excavation at an angle of not less than 30 degrees measured from the vertical, - (b) if the soil is classified as 'likely to crack or crumble soil', the walls are sloped to within 1.5 metres of the bottom of the excavation at an angle of not less than 45 degrees measured from the vertical, and - (c) if the soil is classified as 'soft, sandy or loose soil', the walls are sloped from the bottom of the excavation at an angle of not less than 45 degrees measured from the vertical. ## Loose materials 452 An employer must ensure that loose materials are scaled and trimmed from the sides of an excavation if workers may be on or near the sides. ## Spoil piles - 453 An employer must ensure that a spoil pile is piled so that - (a) the leading edge of the pile is at least 1 metre away from the edge of the excavation, - (b) the slope of a spoil pile adjacent to the excavation is at an angle of not more than 45 degrees from the horizontal, and - (c) loose materials are scaled and trimmed from the spoil pile. ## Power pole support 454 An employer must ensure that work that disturbs the ground in the vicinity of an overhead power line is performed in a manner that does not reduce the original support provided for power line poles. ## Safe entry and exit 455 (1) An employer must ensure that if a worker is required to enter a tren…

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<!-- image --> ## SPECIFIC EXCAVATION REQUIREMENTS Oregon Administrative Rules Oregon Occupational Safety and Health Division - (ii) Ramps and runways constructed of two or more structural members shall have the structural members connected together to prevent displacement. - (iii) Structural members used for ramps and runways shall be of uniform thickness. - (iv) Cleats or other appropriate means used to connect runway structural members shall be attached to the bottom of the runway or shall be attached in a manner to prevent tripping. - (v) Structural ramps used in lieu of steps shall be provided with cleats or other surface treatments on the top surface to prevent slipping. - (2) Means of egress from trench excavations. A stairway, ladder, ramp or other safe means of egress shall be located in trench excavations that are 4 feet (1.22 m) or more in depth so as to require no more than 25 feet (7.62 m) of lateral travel for employees. - (d) Exposure to vehicular traffic. Employees exposed to public vehicular traffic shall be provided with, and shall wear, warning vests or other suitable garments marked with or made of reflectorized or high-visibility material. - (e) Exposure to falling loads. No employee shall be permitted underneath loads handled by lifting or digging equipment. Employees shall be required to stand away from any vehicle being loaded or unloaded to avoid being struck by any spillage or falling materials. Operators may remain in the cabs of vehicles being loaded or unloaded when the vehicles are equipped, in accordance with §1926.601(b)(6), to provide adequate protection for the operator during loading and unloading operations. - (f) Warning system for mobile equipment. When mobile equipment is operated adjacent to an excavation, or when such equipment is required to approach the edge of an excavation, and the operator does not have a clear and direct view of the edge of the excavation, a warning system shall be utilized such as barricades, han…

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## OCCUPATIONAL HEALTH AND SAFETY, 2020 ## Application of Part 17-2 This Part applies to excavations, trenches, tunnels and excavated shafts other than excavations, trenches, tunnels and excavated shafts that are governed by The Mines Regulations . 31 Dec 2020 c S-15.1 Reg 10 s17-2. ## Locating underground pipelines, etc. - 17-3 (1) An employer or contractor shall accurately establish the location of all underground pipelines, cables and conduits in an area where work is to be done and shall ensure that those locations are conspicuously marked: - (a) before commencing work using power tools or powered mobile equipment on an excavation, trench, tunnel, excavated shaft or borehole; or - (b) before breaking ground surface with any equipment to a depth that may contact underground utilities. - (2) If an operation is to be undertaken involving the disturbance of soil within 600 millimetres of an existing pipeline, cable or conduit, an employer or contractor shall ensure that the pipeline, cable or conduit is exposed by hand digging or other approved method before mechanical excavating is allowed to begin within that area. - (3) If an operation mentioned in subsection (2) exposes a pipeline, cable or conduit, an employer or contractor shall ensure that the pipeline, cable or conduit is supported to prevent any damage during backfilling and any subsequent settlement of the ground. - (4) If there is contact with or damage to an underground pipeline, cable or conduit, an employer or contractor shall immediately: - (a) notify the owner of the pipeline, cable or conduit that contact or damage has occurred; and - (b) take steps to protect the health and safety of any worker who may be at risk until any unsafe condition resulting from the contact or damage is repaired or corrected. 31 Dec 2020 c S-15.1 Reg 10 s17-3. ## Excavating and trenching - 17-4 (1) An employer or contractor shall ensure that: - (a) before excavating or trenching begins, if the stability of a struct…

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## R. WORKING AROUND UNDER GROUND UTILITY LINES During operation it is likely that you will be working around or near buried utility lines which may include, but are not limited to: - -Electrical Power Line - -Gas Line - -Water Line - -Communication Line: Telephone or Cable Television Before begining any trenching, drilling or other construction work it is your responsibility to be aware of all such utility lines buried in the area of your project and to avoid them. ALWAYS have all local utility companies mark the location of their lines. Check with local authorities for laws, regulations and/or strict penalties requiring you to locate and avoid existing utilities. ## S. RESTRICTED WORK AREAS In work sites with limited height and swing / traveling areas such as tunnels, bridges, around electrical power lines, other utilities, or inside structures. Use extreme caution on work sites with limited height and swing/traveling areas such as tunnels, bridges, around electrical power lines, other utilities or inside structure. Keep the machine and its attachment a safe distance to prevent injury, death or damage on equipment or structure. Use a flagman to guide the operators. ## T. DO NOT WORK UNDER PRECIPICE / OVERHANG Do not dig under the precipice. It may cause falling rocks or loosening of the precipice resulting in injury, death or machine damage. <!-- image --> <!-- image --> <!-- image --> １

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## 29 CFR 1926 (OSHA) Support system means a structure such as underpinning, bracing, or shoring, which provides support to an adjacent structure, underground installation, or the sides of an excavation. Tabulated data means tables and charts approved by a registered professional engineer and used to design and construct a protective system. Trench (Trench excavation) means a narrow excavation (in relation to its length) made below the surface of the ground. In general, the depth is greater than the width, but the width of a trench (measured at the bottom) is not greater than 15 feet (4.6 m). If forms or other structures are installed or constructed in an excavation so as to reduce the dimension measured from the forms or structure to the side of the excavation to 15 feet (4.6 m) or less (measured at the bottom of the excavation), the excavation is also considered to be a trench. Trench box. See 'Shield.' ## Trench shield. See 'Shield.' Uprights means the vertical members of a trench shoring system placed in contact with the earth and usually positioned so that individual members do not contact each other. Uprights placed so that individual members are closely spaced, in contact with or interconnected to each other, are often called 'sheeting.' Wales means horizontal members of a shoring system placed parallel to the excavation face whose sides bear against the vertical members of the shoring system or earth. ## §1926.651 Specific excavation requirements. - (a) Surface encumbrances. All surface encumbrances that are located so as to create a hazard to employees shall be removed or supported, as necessary, to safeguard employees. - (b) Underground installations. (1) The estimated location of utility installations, such as sewer, telephone, fuel, electric, water lines, or any other underground installations that reasonably may be expected to be encountered during excavation work, shall be determined prior to opening an excavation. - (2) Utility companies or…

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- 180 (2) Where employees are working within 600 mm of underground utility line or piping, an employer shall ensure that - (a) the authority operating the utility line or piping has been notified of the operation, - (b) the utility line has been de-energized, and - (c) an adequate operating procedure is used by the employees. - 180 (3) An employer shall ensure that utility poles, posts and similar structures are supported or removed if they are within 3 m of an excavation or trench that is more than 1.2 m deep. ## Shoring, bracing or caging of walls - 181 (1) An employer shall ensure that the walls of an excavation or trench are supported by shoring, bracing or caging except when the excavation or trench - (a) is less than 1.2 m deep, - (b) subject to subsection (2), is cut in solid rock, - (c) is sloped or benched to within 1.2 m of the bot -tom of the excavation or trench with the slope or bench not exceeding 1 m of vertical rise to each 1 m of horizontal run, or - (d) is one that an employee is not required to enter. ## Support of unstable walls cut in solid rock 181 (2) Where the walls or crests of an excavation or trench are cut in solid rock and are not stable, an em -ployer shall ensure that the walls and crests are ade -quately supported by rock bolts, wire mesh, shoring or a method that provides equivalent support. - 180 (2) Lorsque des salariés travaillent à moins de 600 mm d'une ligne ou d'un tuyau souterrain des ser -vices publics, l'employeur doit s'assurer que - a) l'organisme exploitant la ligne ou le tuyau a été avisé des travaux, - b) la ligne des services publics a été dé-électrifiée, et - c) la procédure de travaux adéquate est suivie par les salariés. - 180 (3) L'employeur doit s'assurer que les poteaux, py -lônes et ouvrages semblables des services publics ont suffisamment de support ou sont enlevés s'il se trouvent à moins de 3 m d'une excavation ou d'une tra…