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Site Health and Safety Plan <br />19133 East Liberty Road, Clements, California <br />August 16, 2022 (Revised June 27, 2023) <br />Page 13 <br /> <br />Sharp Environmental Technologies, Inc. <br />Chemical Name LEL UEL <br />4, 4’-DDT NA NA <br />Dieldrin NA NA <br />Toxaphene NA NA <br />Carbon monoxide 17.5% 74.2% <br />Naphthalene 0.9% 5.9% <br />1,2,4-Trimethyl-benzene 0.9% 6.4% <br />TBA 2.4% 8% <br />LEL = Lower exposure limit <br />UEL = Upper exposure limit <br />NE = None established <br />5.5 Physical Hazards <br />The following potential health and safety hazards may be encountered during scheduled activities at <br />the sites: <br />• Noise <br />• Heavy equipment <br />• Electrical sources <br />• Fire/explosion <br />• Slips, trips, and falls <br />• Illumination <br />• Cold stress <br />• Heat stress <br />• Underground and overhead utilities <br />• Fall protection <br />• Confined space hazards <br />• Materials and equipment handling <br />• Traffic <br />• Safety equipment failure <br />• Excavations <br />• Elevated work platforms <br />• Drilling <br />5.5.1 Noise <br />Hearing protection should be worn at the site if noise levels exceed 85 decibel. Hearing protection with <br />a noise reduction rating of at least 25 decibel should be worn (i.e., earplugs or earmuffs). The SHSS will <br />inform site personnel when and if hearing protection is required. High noise levels are usually <br />associated with the operation of drill rigs, compressors, generators, pumps, motors, and portable hand <br />tools including drills and jackhammers. If loud noise is apparent or if normal conversation becomes