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Site Health and Safety Plan <br />19133 East Liberty Road, Clements, California <br />August 16, 2022 <br />Page 11 <br /> <br />Sharp Environmental Technologies, Inc. <br />Chemical name TWA/STEL/Ceiling IDLH/LEL <br />Xylenes 100 ppm/150 ppm 900 ppm <br />Tetrachloroethene (PCE) 25 ppm/100 ppm/300 ppm 150 ppm (carcinogen) <br />Trichloroethene (TCE) 25 ppm/100 ppm/300 ppm 1,000 ppm (carcinogen) <br />1,1,1-Trichloroethane (TCA) 350 ppm/450 ppm/800 ppm 700 ppm <br />1,1-Dichloroethene (1,1-DCE) 1 ppm/NE/NE NE <br />PAHs 0.1 mg/m3 1,750 mg/m3 (carbon) <br />Chlordanes 0.5 ppb 100 ppb <br />Dieldrin 0.25 ppb 50 ppb <br />4,4-DDD 0.5 ppb 500 ppb <br />4,4-DDE 0.5 ppb 500 ppb <br />4,4-DDT 0.5 ppb 500 ppb <br />Toxaphene NA NA <br />Naphthalene 10 ppm/15ppm/NE 250 ppm/0.9% <br />1,2,4-Trimethyl-benzene 25 ppm/NE/NE NE/0.9% <br />Tertiary butyl alcohol (TBA) 100 ppm/150 ppm/NE 1,600 ppm <br />Arsenic 0.01 mg/m3 5 mg/m3 <br />Lead 0.1 mg/m3 100 mg/m3 <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%