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• • SAFE WORK PRACTICES FOR CONTRACTORS WORKING AT RETAIL PETROLEUMICONVENIENCE FACILITIES 29 9.4.1.1 General Site Management • Do not stand underneath a load that is being handled by lifting or digging equipment. • Stand away from any vehicle being loaded or unloaded,so you will not be struck by spillage or falling materials. • Workers may remain in the cab of a vehicle being loaded or unloaded if the vehicle has a cab shield that provides adequate protection. 9.4.1.2 Surface Crossing of Trenches Surface crossing of trenches should not be made unless absolutely necessary.When necessary,they are only permitted under the following conditions: • Vehicle crossings shall be designed by and installed under the supervision of a Registered Professional Engineer • Walkways or bridges shall: — have a minimum clear width of 20 inches, — be fitted with standard rails, — extend a minimum of 24 inches past the surface edge of the trench. 9.4.1.3 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,hand or mechanical signals,or stop logs.If possible,the grade should be away from the excavation. 9.4.2 Placement of Equipment, Machinery,and Materials In no case may machinery,equipment,or materials be placed any closer than two(2)feet from the edge of the excavation.Mate- rials may not be stockpiled so as to create the potential for material to fall into the excavation.New backfill shall be stockpiled separately from soils and debris that have been removed forth the excavation. 9.5 IMPACT OF CHANGES IN WEATHER,SOIL,AND GROUNDWATER CONDITIONS Whenever there are changes in weather,soil or groundwater conditions,a competent person shall evaluate if the new conditions require changes to protective systems,or if additional methods are required to safeguard the health and safety of the workers and protect the environment. 9.5.1 Standing Water and Water Accumulation Workers shall have the customer's permission before conducting operations that will require personnel to enter an excavation. Effort should be made to use techniques that allow the work to be performed without entering an excavation. The following requirements for water accumulation shall be followed if personnel shall work in the excavation: • Personnel shall not work in excavations where standing water has accumulated. • If water removal or de-watering equipment,such as pumps,are used,they shall be installed and monitored by a competent person. • Personnel shall exit from excavations during rainstorms. • Excavations/Trenches shall be carefully inspected by a competent person after each rain and before personnel are permitted to re-enter. 9.6 ISOLATION OF THE AREA Entry to the excavation work area shall be controlled.The excavation site shall be properly isolated to assure that unauthorized people are not exposed to hazards of the excavation(please see Section 8,Barracading for more information about properly iso- lating work areas).Specific care shall be taken to assure that the excavation area is not accessible to vehicular or pedestrian traffic if the excavation is to be left unattended.