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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 12 <br /> <br />Sharp Environmental Technologies, Inc. <br />Chemical name TWA/STEL/Ceiling IDLH/LEL <br />TWA = Time-weighted average (concentration should not be exceeded during an 8-hour workday during a <br /> 40-hour work-week) <br />STEL = Short-term exposure limit (15 -minute TWA exposure that should not be exceeded at any time during a <br /> workday) <br />IDLH = Immediately dangerous to life or health concentrations <br />LEL = Lower exposure limit <br />ppm = Parts per million <br />NE = None established <br />5.4 Explosive Limits <br />Chemical Name LEL UEL <br />TPH 1.1% 5.9% <br />Benzene 1.2% 7.8% <br />Toluene 1.1% 7.1% <br />Ethylbenzene 0.8% 6.7% <br />Xylenes 0.9% 6.7% <br />MTBE 1.6% 8.4% <br />DIPE 1.4% 7.9% <br />ETBE NE NE <br />TAME NE NE <br />TBA 2.4% 8% <br />Ethanol 3.3% 19% <br />Methane 5.0% 15.0% <br />Propane 2.1% 9.5% <br />MEK 1.4% 11.4% <br />PCE NA NA <br />Acetone 2.5% 12.8% <br />Methylene chloride 13% 23% <br />Di-n-octyl-phthalate NE NE <br />TCE 8% 10.5% <br />TCA 7.5% 12.5% <br />1,1-DCE 6.5% 15.5% <br />Arsenic NA NA <br />PAHs NA* NA* <br />Gamma-chlordane NA NA <br />Alpha-chlordane NA NA <br />4, 4’-DDD NA NA <br />4, 4’-DDE NA NA