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Safety and Health Plan Sandhu Property Tracy, California October 22, 2021 Terracon Project No. NA217074 6 5.0 SITE HISTORY/SCOPE OF SERVICES It is anticipated that soils and/or soil vapor at this project site may be impacted by total petroleum hydrocarbons (TPH), volatile organic compounds (VOCs), organochlorine pesticides (OCPs), and arsenic, and lead. The personal protective equipment and direct-reading air monitoring protocols specified below are designed to prevent personnel exposure to contamination in excess of permissible exposure limits. 6.0 HAZARD ASSESSMENT 6.1 Chemical Hazards Soils, groundwater, and/or soil vapor at this project site may be contaminated with TPH, VOCs, OCPs, arsenic, and lead. Direct contact of skin to contaminated media should be rigorously avoided in an effort to eliminate possible exposure. Benzene is the most significant health hazard contained in petroleum blends and typically comprises less than 1% of regular grade gasolines. Specific health hazard information on petroleum and its most volatile aromatic constituents are provided below. Additional health-hazard information can be found in the chemical information sheets attached to this Plan. Health Hazard Permissible Exposure Limit Description Gasoline 300 ppm ACGIH TLV Gasoline is irritating to the skin, eyes and mucous membranes. Dermatitis may result from prolonged contact with the liquid. Gasoline acts as a central nervous system depressant. Exposure may cause staggering gait, slurred speech and mental confusion. Gasoline exposure may affect the liver, kidneys and spleen. Absorption of alkyl lead antiknock compounds contained in many gasolines poses an additional health concern, especially where there is prolonged skin contact. Diesel Fuel (No. 2-D 100 mg/m3 ppm ACGIH TLV (As mist/vapor) Diesel fuel is a skin and mucous membrane irritant and a central nervous system depressant. Poisoning may affect the liver and kidneys. Skin contact may result in drying and cracking of the skin. Fuel Oil (No. 6) 400 ppm OSHA PEL (as petroleum distillates/naphtha) 0.2 mg/m3 OSHA PEL (Coal Tar Pitch Volatiles, "PNA's") Fuel oil No. 6, or "Bunker Fuel", is of low volatility. It can be irritating to the eyes and skin. This substance is likely to contain polynuclear aromatic hydrocarbons (PNA's), some of which are considered carcinogenic. PNA's present a skin contact hazard. Avoid skin contact with potentially contaminated site materials. Benzene 1 ppm OSHA PEL 5 ppm OSHA 15 min STEL 0.5 ppm OSHA Action Level Benzene is a central nervous system depressant and an eye and skin irritant. Poisoning may cause hemorrhages and immunosuppression. A relationship has been discovered between benzene exposure and leukemia. Benzene is regulated as an occupational carcinogen. Acute exposure may