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A combination explosimeter/oxygen (02) meter will be available on-site to monitor the levels of flammable gases, such as petroleum vapors and methane. An explosimeter should also be used by the subcontractor to verify that the atmosphere inside the underground storage tank has been inerted prior to allowing the tank to be removed. B. PHYSICAL HAZARDS: 1. Mechanical hazards: cuts, abrasions, contusions; slips, trips, falls; being struck or entrapped by moving parts of heavy equipment or failing objects. Such hazards will be minimized by keeping the work area free of equipment and debris that could cause slips, trips or falls and maintaining a safe distance from heavy equipment and moving machinery parts. 2. EIectrical hazards: possible excavation of unanticipated electrical cables and potential contact by heavy equipment with overhead power lines during drilling and excavation. Maintain at least 20 feet clearance from overhead power lines. If unavoidably close to overhead or buried power lines, turn power off and lock out circuit breaker. All equipment will be properly locked/tagged out when required by the Delta Electrical Safety Program. Avoid standing in water when operating electrical equipment. 3. Traffic hazards: Petroleum site work frequently necessitates working in parking Iots, streets or other areas with vehicular traffic. In such instances, the work team will be issued neon traffic safety vests and will use traffic cones and/or barricades as necessary to prevent collision between pedestrians and motor vehicles. 4. Open excavations: When scheduling or work conditions necessitate Ieaving excavations open overnight, security fencing will be erected to restrict access to the site or work zones described in . Section II.G. will be erected C. il'1'II.ITIF.S: List utilities ownership (Electrical, Gas, Sewer, Water, Telephone, Cable TV): A minimum of 48 hours prior to starting excavation, Underground Service Alert or (the state equivalent _ will be contacted and informed of the scheduled field activities. Underground Service Alert identifies which underground utilities are present and notifies their respective owners. The utilities will be located by their respective owners. Prior to drilling, post holes or probing to a depth of 5 feet will be done to ensure no utilities, lines, tanks are in the way. Delta does not assume responsibility or liability for identification,location and notification of underground utilities. D. WORK LI ITTATIONS (time of day,weather, heat/cold stress): In high ambient temperatures (especially in conjunction with high humidity),follow heat-stress precautions: Provide plenty of coot water and electrolytes(e.g. Gatorade). Provide frequent breaks in areas out of direct sunlight and remove protective clothing during breaks. Check resting pulse and increase number of breaks if pulse does not return to normal during work breaks. If possible, alter work schedules so work may be conducted during cooler parts of the early morning or evening. Work may only progress during daylight hours or under conditions of adequate lighting. SHSP-92-MPEIRO PAGE 11