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Site Health and Safety Plan 19133 East Liberty Road, Clements, California August 16, 2022 Page 22 Sharp Environmental Technologies, Inc. aforementioned air monitoring will cover SET related site operations and personnel (i.e., site operations and personnel under the direction and control of SET). If expressly required by this SHSP, the SHSS may also perform air monitoring for other specific designated tasks performed by subcontractors or other third parties at the site that otherwise are not under the direction and or control of SET. Under these circumstances, SET assumes no additional site safety responsibility nor direction nor control for the aforementioned subcontractors or third parties except for the specific and limited assignment of performing air monitoring during the specific site operations expressly covered in this SHSP. The air monitoring conducted by the SHSS or designee will be used to identify and quantify airborne levels of hazardous substances in order to determine the appropriate level of employee protection needed onsite and if possible to delineate work zones. Site-specific action level criteria must be established for all the instruments that may be used in making field health and safety determinations. Other data, such as the visible presence of contamination and/or odors, employee complaints, may also be used in making field health and safety decisions. As a result, the SHSS may establish exclusion zones and/or require a person to wear a respirator even though atmospheric air contaminant concentrations are below established SHSP action levels. For sites containing petroleum hydrocarbons such as gasoline and related compounds, and/or certain chlorinated hydrocarbons such as tetrachloroethylene and/or trichloroethylene, monitoring can be accomplished using a PID with a 10.6 electron-volt lamp or equivalent calibrated to isobutylene. Monitoring for the aforementioned gases and vapors should be done at the source of emission as well as in the breathing zone of site personnel believed to represent the highest risk of exposure. The PID will be checked with a calibration gas standard (hexane or isobutylene) prior to each day’s activities and at any other time when the instrument response is questionable. The instrument check procedure will be recorded in a logbook and initialed by the person performing the procedure. Other methods of air sampling using colorimetric detector tubes, and/or sampling pumps with charcoal tubes may also be used at the direction of the SHSS or if required by this SHSP. If benzene levels could exceed 1 part per million (ppm) for extended periods of time, colorimetric detector tubes specific for benzene will be required. For certain chlorinated compounds (i.e. methyl chloroform), an 11.7 electron-volt lamp should be used in the PID. Consult the NIOSH pocket guide to chemical hazards for information on ionization potentials before selecting the appropriate electron-volt lamp. For sites containing flammable or explosive gases and/or vapors (i.e. methane gas), and/or hydrogen sulfide and/or carbon monoxide, and/or oxygen deficiency atmospheres, monitoring will be accomplished using a four-gas direct reading instrument calibrated for methane, hydrogen sulfide, carbon monoxide and oxygen. Monitoring for the aforementioned gases and atmospheres should be done at the source as well as in the breathing zone of site personnel believed to represent the highest risk of exposure. The four-gas meter will be checked with a calibration gas standard prior to each day’s activities and at any other time when the instrument response is questionable. The aforementioned instrument check procedure will be recorded in a logbook and initialed by the person performing the procedure. For sites containing elevated concentrations of airborne dust that could exceed the applicable PEL, a real-time aerosol monitor will be used. Monitoring for the aforementioned dusts and atmospheres should be done in the breathing zone of site personnel believed to represent the highest risk of exposure. The instrument will be checked prior to each day’s activities according to the manufacturer’s recommendations and procedures and at any other time when the instrument response is questionable.