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Safety and Health Plan Sandhu Property Tracy, California October 22, 2021 Terracon Project No. NA217074 16 If PID readings are less than 10 ppm, monitoring may be conducted at intervals of 10 minutes. If initial PID readings exceed 10 ppm, or if hydrocarbon odors become evident upon during auger advancement, continuous breathing zone air monitoring will be conducted. If sustained PID readings in the breathing zone exceed 25 ppm, personnel will upgrade to respiratory protection as outlined below. Personnel will remain in air purifying respirators until the photoionization detector readings in the breathing zone have fallen and stabilized below 25 ppm. 12.1 Site Action Levels Level D/D Modified Level C Site Evacuation < 25 ppm > 25 ppm > 300 ppm The Action Levels indicated above are for air in the breathing zone and NOT applicable to vapor above containerized soil samples. The Action Levels are established to prevent exposure to airborne petroleum hydrocarbon vapors in excess of established exposure limits. Although the Action Levels indicated for Site Evacuation are within the protective capacity of the respirator cartridges specified below, personnel will evacuate to the UPWIND side of the site if the continuous breathing zone vapor concentrations exceed these limits. The SSO will contact the Corporate Safety and Health Manager for discussion and re-evaluation of personal protective equipment and air monitoring requirements if airborne contamination exceeds Site Evacuation Action Levels. In the event that site evacuation is required, a modification of this safety and health plan will be issued with contingencies for combustible gas monitoring and upgrading to Level B personal protective equipment. 13.0 PERSONAL PROTECTIVE EQUIPMENT REQUIREMENTS The air monitoring regimen identified above will allow initial project activity to begin in LEVEL D personal protective equipment to include: •Hard Hat •Safety Footwear (ASTM spec; Impermeable or with outer impermeable covers) •Nitrile or Neoprene Rubber Outer Gloves •Nitrile Glove Liners •Safety Eye Wear (ANSI Z-87 specification) •Hearing Protection (if within 10 feet of drill rigs, concrete coring or other equipment which impairs normal conversation at < 5 feet.) If petroleum saturated soils and potential splashing conditions develop during the course of the assessment, personnel will upgrade to LEVEL D MODIFIED personal protective equipment. Level D Modified personal protective equipment ensemble consists of the above, plus: