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Health and Safety Plan 1319 & 1327 South Madison Street, Stockton, CA 432770 headlamps as appropriate for the activity being conducted. Personal security will be assessed and measures taken as discussed above if appropriate. B15: Severe Weather Severe weather conditions include high winds, electrical storms, and heavy rain. At a minimum, all work outdoors will cease during these events. When lightning is spotted, site personnel should use the following steps to avoid injury: • Workers should note the flash-boom ratio (i.e., count the seconds after the lightning was seen until the thunder was heard). • By counting the seconds between seeing lightning and hearing thunder and dividing by 5, you can estimate your distance from the storm (in miles). If the storm is 6 miles away or less (30 seconds between when lightning was seen and thunder was heard) workers must stop work and take shelter. • If the storm is more than 6 miles away (greater than 30 seconds between lightning and thunder), the site supervisor should monitor the storm and be prepared to cease work if the storm approaches an unsafe distance. Since storms can travel at varying speeds and the amount of time at takes to cease and secure operations will also vary, so prudent judgment should be exercised when storms are in the vicinity and/or developing (e.g., darkening skies, increasing wind speeds, etc.). • Workers should not stay in exposed areas (outdoors on the ground, on a roof, in an aerial lift, on a steel truss, on an ungrounded steel structure, in a golf cart, un-sided building, etc.) after lightning has been witnessed. All personnel must move to a safe location. • Workers should wait 30 minutes from the last sight of lightning or sound of thunder before returning to work. • Those required to travel from one building to another during the 30 minute wait time should do so only by enclosed vehicle. • Once the 30 minute wait time period has elapsed and no additional lightning or thunder has been seen or heard, individuals may resume normal work. B16: Aboveground and Underground Utilities - Various forms of underground and aboveground utility lines or pipes (carrying water, wastewater, gas, and or electricity) may be encountered during work activities. Prior to the start of intrusive activities, all utilities must be located and measurements must be instituted to avoid contact with these structures in accordance with the procedures outlined in the site-specific HASP. All utility lines and piping will be identified and rendered controlled (though lockout/tagout procedures) or protected from damage. Work involving machinery with high extensions (backhoes, etc.) will remain at least 6 feet (2.1 meters) from overhead power lines. B17: Trenching/Excavation - An excavation is any manmade cut, cavity, trench, or depression in an earth surface, formed by earth removal. A trench is narrow excavation (in relation to its length) made below the surface of the ground. The following safe operating guidelines apply to open trenches or excavations exceeding four (4) feet in depth or of any depth if in unstable soil conditions. • Excavated materials will be stored and retained at least 2 feet from the edge of the excavation. This procedure must be observed even when excavation/trench entry will not occur.