2561 0 obj <> endobj 8. Exceptions to the requirement for excavation protective systems include circumstances where excavations are less than 5 feet (1.52 meters) in depth and where examination of the ground by a competent person provides no indication of a potential cave-in. If the trench is less than five feet deep, a competent person can decide whether a protective system is necessary. All excavations 20 feet or less in depth which have vertically sided lower portions shall be shielded or supported to a height at least 18 inches above the top of the vertical side. In wet ground a considerably flatter slope will be required. All excavations deeper than 1.2 mtrs. A trench is an excavation in which the depth exceeds (is bigger than) the width. Never throw tools/materials into an excavation always pass hand to hand orlower on a rope. Materials and equipment used for protective systems shall be free from damage or defects that might impair their proper function. Sloping and benching systems not utilizing Option (1) or Option (2) or Option (3) under paragraph (b) of this section shall be approved by a registered professional engineer. h��VmO�8�+����� !�]�V����C��Jti�� ����;i�-�[��D����~��8�8��if��yj-�:�)��Ypd���C�s&�B�Le��Iv����|��Y�ԋ����s�}�]d��|Y���МUŪ�[]�|m�bzqJ٧�l�o�ĵ���q����f1X�:�����eV��cg�w�y�/7��뺝N��=�h�9�?��y�*�ofyU~mʣ�+�B�9f%�0�����\��lI�6E;ʮ��*�HukҜg�Z0�O�eU0�]�����b�M�ܮ��>-E[wz "~ �: ��$��A�*@�&H��101rM ��!��� � �� d. none of the above . Excavations less than 5 ft (1.5 m) in depth and which a CP examines, determines and documents that there is no potential for cave-in do not require protective systems, however, a fixed means of egress shall be provided. Appendix B Sloping and Benching is essentially OSHA’s tabulated data for open cut trenching and all provisions of the data must be adhered to. Stability of Adjacent Structures . Excavations less than 5 ft deep. Employees may work in excavations less than 5 feet in depth without a protective system provided that the ground is evaluated by a competent person who determines that there is no indication of a … For excavations less than 5 ft (1.5 m) deep, the competent person will examine the excavation for potential cave-in hazards and determine if a protective system is needed. The tabulated data shall be in written form and include all of the following: Identification of the parameters that affect the selection of a protective system drawn from such data; Identification of the limits of use of the data; At least one copy of the tabulated data, which identifies the registered professional engineer who approved the data, shall be maintained at the jobsite during construction of the protective system. OSHA’s Excavation Safety Standards • In place since 1989 • 37% of all trenching incidents occur at depths less than 5 feet! *v�| `c����r��w ���� 2572 0 obj <>/Filter/FlateDecode/ID[<538E1AC54F548F4ABD4C0ACDBA70F9FF><4CC4B641FB957340BC41CBBC8BDA67FF>]/Index[2561 22]/Info 2560 0 R/Length 68/Prev 898891/Root 2562 0 R/Size 2583/Type/XRef/W[1 2 1]>>stream Slopes specified in paragraph (b)(1)(i) of this section, shall be excavated to form configurations that are in accordance with the slopes shown for Type C soil in appendix B to this subpart. Refer to Chapter 25 EXCAVATIONS AND TRENCHING in the EM 385-1-1 while preparing the … Except in stable rock, excavations below the level of the base of footing of any foundation or retaining wall shall not be permitted unless: a. 7, 2, 5 . Protective systems shall be capable of resisting all loads that could reasonably be expected to be applied to the system. Footnote(2) A short-term maximum allowable slope of 1/2H:1V (63º) is allowed in excavations in Type A soil that are 12 feed (3.67 m) or less in depth. Note: The risk assessment may indicate the need to install trench supports (or other alternative protective measures) even in relatively shallow excavations less than 1.25 m deep, particularly if ground conditions are particularly poor or the nature of the work requires workers to lie or crouch in a trench. Manual excavation method s are generally used for small, shallow excavations (for example less than 1.5 metres deep) in soft soils. Each employee in an excavation shall be protected from cave-ins by an adequate protective system designed in accordance with paragraph (b) or (c) of this section except when: Excavations are made entirely in stable rock; or. If the competent person cannot assure the material or equipment is able to support the intended loads or is otherwise suitable for safe use, then such material or equipment shall be removed from service, and shall be evaluated and approved by a registered professional engineer before being returned to service. A 4-foot-deep trench that an inspector said provides no indication of a potential cave-in Dangers of Trenching and Excavation. All excavations more than 8 feet but not more than 12 feet in depth with unsupported vertically sided lower portions shall have a maximum allowable slope of 1:1 and a maximum vertical side of 3 1/2 feet. Contractors must give the Department 24 to 48 hour notice before beginning excavation, rock blasting, or rock chipping. excavations are less than 5 feet and examination of the ground by a competent person provides no indication of a potential cave -in. What are the hazards associated with trenching and excavation? “A protective system is not required to be utilized in an excavation unless it is at least five (5) feet … At least one copy of the tabulated data which identifies the registered professional engineer who approved the data, shall be maintained at the jobsite during construction of the protective system. h��S�k�@�&���Ҹ���Ei��C At least one copy of the design shall be maintained at the jobsite while the slope is being constructed. b. If forms or other structures are installed or constructed in an excavation as to reduce the dimension measured from the forms or structure to the side of the excavation to 15 feet or less, the excavation is also considered to be a trench. An excavation is an opening or depression dug into the earth’s surface.) (4 meter) must be shored or the sides must be sloped to a safe angle; Provide barrier around deep excavations. Excavations are less than 5 feet (1.52m) in depth and examination of the ground by a competent person provides no indication of a potential cave-in. Designs shall be in written form and shall include the following: A plan indicating the sizes, types, and configurations of the materials to be used in the protective system; and. Short-term maximum allowable slopes for excavations greater than 12 feet (3.67 m) in depth shall be 3/4H:1V (53º). h�bbd``b`1�w@��[ Specifically, 1926.652(a)(1)(ii) explains that when excavations are less than 5 feet deep and examination of the ground by a competent person indicates no potential cave-in, employees are safe to work in the trench. endstream endobj 2565 0 obj <>stream Keep soil heaps, tools and vehicles back 0.5m away from the edge of excavations. Excavation All Contractors with permits to conduct earthwork (excavation) must notify the Department before work may begin. �����,AZY���$���=t(�x�;�{Q�+�^ě z0oE�RP(�?��7��d�t/��7����� y $n �.tL�E+)L&�����.��E���9�G���N�cy�fL�a����d'ה o��X��kѴB�ri�;ZV��׸)����| ;T+X��D�0w H��UKo�F��WLo�@I `)�"n�@n��Z�t%���}gf)���ƽ���h9�o��v�^l��|. Excavations are less than 5 feet (1.52m) in depth and examination of the ground by a competent person provides no indication of a potential cave-in. %PDF-1.5 %���� Excavations 5 ft deep or deeper. Removal shall begin at, and progress from, the bottom of the excavation. (1) - Each employee in an excavation shall be protected from cave-ins by an adequate protective system designed in accordance with paragraph (b) or (c) of this section except when: (ii) - Excavations are less than 5 feet (1.52 m) in depth and examination of the ground by a competent person provides no indication of a potential cave-in. K�K�. Shield systems shall not be subjected to loads exceeding those which the system was designed to withstand. In California, if the excavation is more than 5 feet deep, it needs a permit from Cal/OSHA and there needs to be a protective system (benching, shoring, sloping, etc.) Designs of support systems, shield systems, or other protective systems shall be selected from and be in accordance with tabulated data, such as tables and charts. Excavations and trenches less than 5’ deep require an AHA but the plan is optional. Regulation 60 A person conducting a business or undertaking must manage the risk of a musculoskeletal disorder associated with … A trench excavation is a narrow excavation made below the surface of the ground where the depth is greater than the width, but the width of a trench (measured at the bottom) is less than 15 feet. Excavation failures are particularly dangerous because they may occur quickly, … TRENCHING & EXCAVATION SAFETY Less than 5 ft. in depth, an AHA is required; plan is optional Greater than 5 ft. in depth an AHA and plan are required. 1926.652(a)(2) Protective systems shall have the capacity to resist without failure all loads that are intended or could reasonably be expected to be applied or transmitted to the system. A short term maximum allowable slope is a special situation for Type A soil. OSHA has specific regulations for trench excavation … The minimum horizontal width (excavation face to formwork/wall) at the … Designs shall be in written form and shall include at least the following: The magnitude of the slopes that were determined to be safe for the particular project; The configurations that were determined to be safe for the particular project; and. To notify the Excavation Unit, call (212) 393-2550. endstream endobj 2562 0 obj <>/Metadata 165 0 R/OCProperties<>/OCGs[2573 0 R]>>/Outlines 182 0 R/PageLayout/SinglePage/Pages 2545 0 R/StructTreeRoot 313 0 R/Type/Catalog>> endobj 2563 0 obj <>/Font<>/Properties<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 2564 0 obj <>stream Where oxygen deficiency (atmospheres containing less than 19.5% oxygen) exists or could reasonable be expected to exist, the atmospheres in the excavation must be tested before employees enter excavations great than _____ in depth. ����AJ pR�^BO��p�-��)o��}?D$�$ �-FC���Q�YȦ�g�8t��T��$؃x�hˬ���3Z���[ Z �4�ϖrb6 Y 2��Jšu��R1��ľ��H�ZÔL$�c �>i���.3�������'�v�W~֙G�]G/'^���K/h.�ˉ�%����r}��C��t]-��{�cP��$srL�}��i~�iھ�4w�⧄$���e�5N�r�X�?�˂���md���0�RxR��o�B,��wEÃ���`�����v�`l�:V‚o�K����S��T�Q0��oJ�1�u�DvC����^p@��N���|k �1�9� #�O�2��� ��_7?�x�7q $��v ���P�|e8�=P�ŭ���w�� Z��$�fɂnet��h�ί�yOz{�ы��P�$B2'% ��`pL���S�P ق���]���.6�"P4�J�X���P�1,��c 8���$�8�o���O'J����(�aK�S��� Let’s back up for a moment. When material or equipment that is used for protective systems is damaged, a competent person shall examine the material or equipment and evaluate its suitability for continued use. • Therefore, based on the competent person’s examination, shoring may still be required. Competent Person The following persons are considered competent persons: AVP for Facilities and Planning 2582 0 obj <>stream For excavations less than 5 ft (1.5 m) deep, the competent person will examine the excavation for potential cave-in hazards and determine if a protective system is needed. This can either be found as a single bench at the bottom of the trench or a multiple bench system. ���З OSHA defines a trench as a narrow excavation that is deeper than it is wide, but no more than 15 feet wide at the base of the trench. a. In granular soils, the angle of slope should be less than the natural angle of repose of the material being excavated. After that time the design need not be at the jobsite, but a copy shall be made available to the Secretary upon request. Battering the excavation sides – Battering the excavation sides to a safe angle of repose may also make the excavation safer. Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. True. Provide slope not less than 1:1 and suitable depth of excavation in all soils except hard rock. trenchis a narrow excavation, not more than 15 feet wide at the bottom. 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 meters). Excavations are less than 5 feet (1.52m) in depth and examination of the ground by a competent person provides no indication of a potential cave-in. in place to protect the workers inside. An Excavation/Trenching Plan and AHA are required for excavations and trenches greater than 5’ deep. The house foundation/basement excavation is less than 71/ 2 feet (2.5 meters) deep or is benched for at least 2 feet (0.61 meters) horizontally for every 5 feet (1.52 meters) or less of vertical height. 1926.652(a)(2) Protective systems shall have the capacity to resist without failure all loads that are intended or could reasonably be expected to be applied or transmitted to the system. Excavations shall be sloped at an angle not steeper than one and one-half horizontal to one vertical (34 degrees measured from the horizontal), unless the employer uses one of the other options listed below. Maintain sufficient angle of repose. Deviation from the specifications, recommendations, and limitations issued or made by the manufacturer shall only be allowed after the manufacturer issues specific written approval. Excavation of material to a level no greater than 2 feet (.61 m) below the bottom of the members of a support system shall be permitted, but only if the system is designed to resist the forces calculated for the full depth of the trench, and there are no indications while the trench is open of a possible loss of soil from behind or below the bottom of the support system.  Where oxygen deficiency (atmospheres containing less than 19.5% oxygen) exists or could reasonable be expected to exist, the atmospheres in the excavation must be tested before employees enter excavations great than _____ in depth. Failure to … All excavations deeper than 1.2 mtrs. Installation of a support system shall be closely coordinated with the excavation of trenches. Although trench and excavation work can be very dangerous, injuries and fatalities are completely preventable. 7 ½, 2, 5 . Excavations 5 ft deep or deeper. 2. The identity of the registered professional engineer approving the design. Damp sands and sandy gravel. 7. Keep soil heaps, tools and vehicles back 0.5m away from the edge of excavations. Paragraph (a) of 29 CFR 1926.652 tells us when a protective system is needed for trenches. For excavation and trench exemption to apply, all the following conditions must exist: The excavation is less than ___ feet deep or is benched for at least ___ feet horizontally for every ___ feet or less of vertical height. excavations less than five (5) feet in depth where examination of the ground by Responsible Person provides no indication of a potential cave-in. 5 FEET For excavations less than 5 feet in depth do not require protective system if competent person examines and determines there is no potential for a cave-in. They are cohesion less soil that able to stand at a slope equal to their angle of repose disregard of the excavation depth. Where excavations are less than 5 feet (1.52 m) in depth and examination of the ground by a competent person provides no indication of a potential cave-in, there are no additional steps necessary to prevent cave-ins. Support systems, shield systems, and other protective systems not utilizing Option 1, Option 2 or Option 3, above, shall be approved by a registered professional engineer. c. 7 ½, 5, 2 . OSHA's general excavation standards require that protective systems, such as benching, sloping, shoring or shielding, be used in trenches that are deeper than five feet unless the site is comprised entirely of stable rock. 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 meters). Manufactured materials and equipment used for protective systems shall be used and maintained in a manner that is consistent with the recommendations of the manufacturer, and in a manner that will prevent employee exposure to hazards. There are really two main reasons to bench a trench rather than slope a trench. %%EOF Design of support systems, shield systems, or other protective systems that are drawn from manufacturer's tabulated data shall be in accordance with all specifications, recommendations, and limitations issued or made by the manufacturer. After that time the data may be stored off the jobsite, but a copy of the data shall be made available to the Secretary upon request. What is an Excavation Hazard? They create the following potential hazards: Individual members of support systems shall not be subjected to loads exceeding those which those members were designed to withstand. After that time, the design may be stored off the jobsite, but a copy of the design shall be made available to the Secretary upon request. Employees shall not be allowed in shields when shields are being installed, removed, or moved vertically. Footnote 3 clearly states that that excavations greater than 20-ft in depth must be engineered. If you install formsor other structures in an excavation that reduce its width to less than 15 feet, measured at the bottom, the excavation is also considered a trench. (A trench is a narrow excavation less than 5 m wide and deeper than its width. Contact with buried electric cable, Gas / Oil Pipelines: Electrocution, and Explosion Obtain permission from competent authorities prior to excavation if needed. Shields shall be installed in a manner to restrict lateral or other hazardous movement of the shield in the event of the application of sudden lateral loads. Backfilling shall progress together with the removal of support systems from excavations. Working in trenches and excavations is hazardous to both the workers who work inside them, and to workers on the surface. 0 ��%�p=� r�5y�u�'��\�I��n+%\Eٕfq&��l���������^w������[]��u7�7Yr}ջS�tg3��9���z�����y��Φ�1����O4��%3m�"�J�\\D�I����3-Aˤ��&��%�e��F��0ZK�����`G�]�:�Sv�v�K\:�`�K�i�qi��e��ōUAi,�K45^^H�xJ^M���i,U#���o����qW�t��pֺu(-�6���m��skz8.��a � �́x�'x| u��qx�}0k/������0 �� True. 1926.652(a)(1)(ii) 6 FEET Guardrails are required on walkways that are over excavations 6 feet or more above lower levels. INTRODUCTION. In general, the depth is greater than the width, but the width of a trench is not greater than 15 feet. �ĕ��nҳz�^��2�+�I�)��y�l��S�t���g�K�̓��?��楠�nַu � Occupational Safety & Health Administration. If a trench shield is used inside a sloped excavation the 20-ft rule still applies. After that time this data may be stored off the jobsite, but a copy shall be made available to the Secretary upon request. 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