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HASP-Additional Site Investigation for PFAS BSK Project#E20-016-01F Stockton Metropolitan Airport(SCK) May 5,2023 Stockton, California Page 5 • Have an assistant guide the driver when in close proximity to hazards or if clearance is at a mini- mum. • Set the brakes and/or block the wheels when the mast is set up. • The mast must be lowered when traveling off-road. • Be certain of the status of utilities (energized, charged, etc.) in the area of the rig. Call Under- ground Service Alert (USA North; 811)for assistance in locating utilities. • Consider overhead lines to be energized. Watch for sagging lines when entering a Site; call the utility for assistance in moving them. • Do not operate the drilling rig within 15 feet of overhead lines; check with local authorities to confirm the distance requirement. • Make sure the Site is clear of obstructions, debris, etc., prior to setting up the drilling rig. • Maintain proper"housekeeping" around and on the drilling rig at all times. Tools should be stored in a manner that permits convenient access but also considers personnel safety. • Keep platforms,walkways and scaffolding free of obstructions and excess grease or oil that could cause a surface to become slick and dangerous. • Store gasoline only in approved flammable storage containers with spark arresters. • Check drilling rig equipment prior to starting work; repair or replace faulty items. • Handle augers with care and use proper lifting technique. • Use a tool hoist for larger augers whenever possible. • Stay clear of rotating augers. • Level and stabilize the drilling rig prior to raising the mast. • Watch for slippery ground and rig surfaces when mounting or dismounting the platform. • Unattended boreholes must be adequately covered or protected. • Avoid drilling during electrical storms. 3.4 Heat Stress Recognition and Control Heat stress is likely to be a significant hazard when ambient temperatures exceed 85°F. Evidence for heat stress includes flush skin, rash, irritability, faintness, and dry, cool skin. Wearing Personal Protective Equipment (PPE) can place a hazardous waste worker at considerable risk of developing heat stress. This can result in health effects ranging from transient heat fatigue to serious illness or death. Heat stress is caused by a number of interacting factors, including environmental conditions, clothing, workload, and the individual characteristics of the worker. Because heat stress is one of the most common (and potentially serious) illnesses at hazardous waste Sites, rest periods, adequate drinking water intake, and regular monitoring for signs and symptoms of distress are vital. Heat-stress monitoring should commence if personnel are wearing PPE (including Tyvek-type coveralls) and the ambient temperature exceeds 700 F; if impermeable garments are not worn, monitoring should commence at 850 F. Heat-stress monitoring should be conducted by monitoring the heart rate as early as possible in the rest period. The heart rate should not exceed 110 beats per minute at the beginning of Ei1<®