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7. Environmental Conditions and Response 7.1 Adverse Weather Conditions In the event of adverse weather conditions, the SHSO or project principal will determine if work can continue without jeopardizing the health and safety of field workers. Some of the items related to adverse weather conditions to be considered prior to determining if work should continue include: • Potential for heat stress and heat-related injuries; • Potential for cold stress and cold-related injuries; • Treacherous weather-related conditions. If wind speed is greater than 15 mph averaged over a 15- minute period or wind gusts over 25 mph, earthmoving operations will be ceased • Limited visibility; and, • Electrical storm potential. Site activities will be limited to daylight hours and acceptable weather conditions. Inclement working conditions may include heavy rain, fog, high winds, and lightning. The SHSO and/or PM shall observe daily weather reports and evacuate, if necessary, in case of inclement weather conditions. 7.2 Adverse Air Quality The air quality at the Site may be impacted from wildfires in the region or beyond. This is especially true during the wildfire season that is typically from mid-May to mid-October in Northern California and in Southern California through mid-November. The wildfire season peak usually occurs between July and November, when hot, dry winds are most frequent. During wildfire season, there is the potential for breathing in fine particles associated with wildfire smoke. This particulate matter can result in irritation to the lungs and potentially lead to serious complications, such as reduced lung function, bronchitis, worsening asthma, etc. Title 8, Section 5141.1 provides guidelines during wildfires that are based on the Air Quality Index (AQI) for particulate matter (PM) 2.5, which is the smallest and usually most harmful particulate matter (2.5. micrometers or smaller). An AQI over 100 is unhealthy for sensitive people and an AQI over 150 is unhealthy for everyone. Air Quality Index(AQI), Conversion for PM 2.5, and Level of Health ConcernM PM 2.5 Concentration AQI Levels of Health Concern 0 to 12 0 to 50 Good 12.1 to 35.4 51 to 100 Moderate 35.5 to 55.4 101 to 150 Unhealthy for Sensitive Groups 55.5 to 150.4 151 to 200 Unhealthy 150.5 to 250.4 201 to 300 Very Unhealthy 250.5 to 500.4 301 to 500 Hazardous 01 California Code of Regulations Title 8,Section 5141.1 Appendix A(htti)s://www.dir.ca.gov/title8/5141 1 a.html). 5175.0001S102/HSP Site-Specific Health and Safety Plan I ROUX 118