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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 7 3.6 Underground Utilities If drilling equipment is to be used, BSK will attempt to locate underground utility locations prior to commencement of drilling activities. Resources may include Site plans, utility companies, subsurface geophysical scans, Underground Service Alert (USA; 811), and hand auguring methods. 3.7 Traffic Hazards The Site is in an active metropolitan airport. Work vehicles and equipment are present along the paved roadways, service, and taxiways. Be aware of equipment and vehicles traveling and working in the area. Aircraft and airport-related equipment will be present. Always give aircraft and airport equipment traffic the right of way and assume the operator/pilot cannot see you. Signs will be used to notify approaching persons and vehicles that they are entering a restricted work/exclusion zone. 3.8 Chemical Hazards Chemical hazards at Sites can pose a wide range of physical and health hazards. Physical hazards include flammability,corrosion and reactivity. Health hazards include irritation,sensitization,and carcinogenicity. Principal routes of exposure are inhalation,absorption,skin and/or eye contact, and ingestion. Protective measures include safety glasses, disposable protective clothing, and disposable protective gloves. Decontamination is by washing with soap and water. Per- and Polyfluoroalkyl Substances (PFAS) are a large group of synthetic fluorinated chemicals widely used in industrial processes and consumer products. These synthetic compounds are very persistent in the environment. PFAS can affect the immune system, increase the risk of some cancers, increase cholesterol levels,change the liver,thyroid and pancreatic functions,and interfere with the body's natural hormones. Principal exposure routes for these compounds include the following: • Ingestion of contaminated food, soil, and water, especially if poor personal hygiene is practiced; • inhalation of vapors and contaminated dust; and • skin absorption. Volatile organic compounds (VOCs) are considered to be a health risk and may have carcinogenic potential. Volatile organic compounds include those associated with chlorinated solvents and heavy metals may be present on Site. Principal exposure routes for these compounds include the following: • Inhalation of vapors and contaminated dust; • skin absorption; • ingestion of contaminated soil and water, especially if poor personal hygiene is practiced; and • skin and/or eye contact with contaminated soil or water.