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Site Health and Safety Plan 19133 East Liberty Road, Clements, California August 16, 2022 Page 24 Sharp Environmental Technologies, Inc. 6.2 Air Monitoring Specifications Instrument Tasks Action Levels a PPE Frequency b Calibration PID: OVM with 10.6eV lamp or equivalent Sampling and excavation <5 ppm >5 ppm >25 ppm Level D Level C Stop work, contact HSM Initially and periodically during task Daily CGI: MSA model 260 or 261 or equivalent Sampling and excavation 0-10% 10-25% LEL >25% LEL No explosion hazard Potential explosion hazard Explosion hazard; evacuate or vent Continuous during advancement of boring or trench Daily Landtec GEM 2000 methane gas meter Sampling and excavation if warranted 0-0.5% 0.5-1.25% >1.25% No explosion hazard Potential explosion hazard Explosion hazard; evacuate or vent Periodically Daily Detector Tube: Draeger benzene specific 0.5/c (0.5 to 10 ppm range) with pre-tube, or equivalent Sampling <0.5 ppm 0.5-1 ppm >1 ppm Level D Level C Level B Initially and periodically when PID/FIB >1 ppm Not applicable Nose-Level Monitor d Sampling and excavation <85 dB(A) 85-120 dB(A) 120 dB(A) No action required Hearing protection required Stop; re-evaluate Initially and periodically during task Daily Dust Monitor: Miniram model PDM-3 or equivalent Excavation, earthmoving <0.05 mg/m3 >0.05 mg/m3 Level D Level C Continuous during earthmoving tasks Daily a Action levels apply to sustained breathing-zone measurements above background. b The exact frequency of monitoring depends on field conditions and is to be determined by SET; generally, every 5 to 15 minutes if acceptable; more frequently may be appropriate. Monitoring results should be recorded. Documentation should include instrument and calibration information, time, measurement results, personnel monitored, and place/location where measurement is taken (e.g., “breathing zone”, “at surface”, etc.). c If the measured percent of O2 is less than 10, an accurate LEL reading will not be obtained. Percent LEL and percent O2 action levels apply only to ambient working atmospheres, and not to confined-space entry. More stringent percent LEL and O2 action levels are required for confined-space entry. d Noise monitoring and audiometric testing also required. 6.3 Exposure Monitoring Plan Before any field activities commence, wind direction indicator may be used to ensure the direction that personnel will move when instructed to do so or in an emergency. This wind measurement will be followed by the sampling of the general background levels of gasoline, VOCs, dust etc.