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Geocon Project No. S2170-07-12 - 10 - June 6, 2022 Hazard: In addition to the chemical, physical and operational hazards referenced above, heat stress may present a potential hazard to on-site personnel during the on-site operations. This hazard can be created when individuals work in warm temperatures while wearing relatively impervious protective clothing. When ambient air temperatures at the site exceed approximately 75 degrees Fahrenheit, heat stress can result. If these conditions are encountered, the precautions referenced below should be implemented. Controls: The PSO should regularly monitor ambient air temperature. Field team members will be observed for signs and symptoms of heat stress including: dizziness, profuse sweating, skin color change, and increased heart rate and vision problems. Personnel who exhibit any of these symptoms will be removed from field work and requested to consume 2 to 4 pints of electrolyte fluid or cool water every hour while resting in a shaded area. The individual should not return to work until the symptoms are no longer recognizable. If symptoms appear critical, persist or get worse, seek immediately medical attention. To control the potential occurrence of heat stress, preventive measures will be evaluated and implemented on a daily basis (ref. T8 CCR §3395 Heat Illness Prevention). These measures may include: • Schedule periodic cooling and rest (recovery) periods in a shaded area (ref. T8 CCR §3395(d) Heat Illness Prevention); • Designated shaded rest areas, or portable shade structures must be available when the ambient daily high temperature is predicted to exceed 85 degrees Fahrenheit, or 75 degrees Fahrenheit if CPC will be required to be worn; and, • Inducement of water intake, the equivalent quantity of 1 quart of water per hour per on-site staff (2 gallons per person) be available before work begins unless provisions for immediate water replenishments are available (nearby store, plumbed water supply, etc.). Water must always be replenished before running out (ref. T8 CCR §3395(c) Heat Illness Prevention). The implementation frequency of these measures will be the responsibility of the Project Manager or PSO. 3.7 Chemical Hazards – Petroleum Hydrocarbons, PCE, and Lead The risk of significant exposure to soil and soil vapor contaminants is considered to be low while performing direct-push soil characterization and soil vapor sampling tasks required on this project. Detailed information regarding the physical description of petroleum hydrocarbons and benzene, including health hazards, routes of entry into the body, signs and symptoms of exposure and target organs, and chemical and physical properties is available in Attachment A – Petroleum Hydrocarbons and Attachment B – Benzene. The chemical guides for petroleum hydrocarbons are published in the National Institute for Occupational Safety and Health (NIOSH) Guide to Chemical Hazards. Detailed information regarding the physical description of PCP, including health hazards, routes of entry into the body, signs and symptoms of exposure and target organs, and chemical and physical properties is