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Port of Stockton Phase II ESA �� Health and Safety Plan 4.0 Adverse Weather Conditions 4.1 Hazard Identification During the course of field operations, severe weather may be encountered, including thunderstorms, rainstorms, tornados, and other unsafe weather conditions (e.g., high winds). Criteria indicating that severe weather conditions may exist include: • High winds (greater than 30 miles per hour—depending on the tree cover and other site specific conditions) • Severe storm watch or warning in place for the area • Visible lightning within 6 miles • Extreme temperatures (e.g., greater than 100 degrees Fahrenheit [°F] or less than 32°F) • Heavy rainfall or fog that makes footing treacherous and visibility difficult Stop work and take emergency precautions when severe weather conditions require action. 5.0 Fire The Site may have overgrown brush; vehicles or other equipment with exhaust systems could potentially ignite brush coming in contact with exhaust system components. 5.1 Hazard Mitigation/Prevention Smoking will not be permitted by HDR employees and its subcontractors while on site. Drilling subcontractors will be equipped with 1A:10BC ABC fire extinguishers. These are of small capacity and will fully discharge/empty in a few seconds, so they can only be used to extinguish very small fires. The operator must have received training on the use and limitations of fire extinguishers, and they should be visually inspected monthly to confirm they remain fully charged and operable. 5.2 Immediate Action Upon detecting a fire, employees will determine whether the fire is small enough to readily extinguish with immediately available portable extinguishers, or if other firefighting methods are necessary. Non-essential personnel will be directed away from the area of the fire. If it is judged that a fire is small enough to fight with available extinguishing media, employees will attempt to extinguish the fire provided that: • It is an incipient fire (less than the size of a 55-gallon barrel) and the personnel approaching the fire have been trained in the use of fire extinguishers. • They are able to approach the fire from the upwind side, or opposite to the direction of the fire's progress; the correct extinguisher(Class ABC) for the potential fire is readily available. • No known complicating factors are present, such as the likelihood of rapid spread, imminent risk of explosion, or gross contamination. 6 �