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<br />Geocon Project No. S2170-07-12 - 12 - June 6, 2022 <br />3.7.1.3 Benzene <br />T8 CCR GISO Article 110 Regulated Carcinogen §5218 <br />Exposure Route: Inhalation, ingestion, skin contact; ref. Attachment B - T8 CCR §5218 Benzene - <br />Appendix A <br />CHEMICAL NAME & CAS# ROUTES OF ENTRY PUBLISHED EXPOSURE LIMITS <br />CATEGORY CONCENTRATION SOURCE <br />Benzene Inhalation <br />71-73-2 Skin Absorption <br />PEL-TWA 1 ppm Cal/OSHA <br />STEL 5 ppm <br />3.7.1.4 Aromatic Petroleum Distillates <br />CHEMICAL NAME AND CAS# ROUTES OF ENTRY PUBLISHED EXPOSURE LIMITS <br />CATEGORY CONCENTRATION SOURCE <br />Ethylbenzene Inhalation <br />100-41-4 <br />Ethanol; Ethyl alcohol Inhalation <br />64-17-5 <br />Methyl tert-butyl ether Inhalation <br />(MTBE) 1634-04-4 <br />Naphthalene Inhalation <br />91-20-3 Skin Absorption <br />Toluene Inhalation <br />108-88-3 Skin Absorption <br />Xylenes Inhalation <br />1330-20-7 <br />PEL-TWA 100 ppm Cal/OSHA <br />STEL 125 ppm <br />PEL-TWA 1000 ppm Cal/OSHA <br /> <br />PEL-TWA 40 ppm Cal/OSHA <br /> <br />PEL-TWA 0.1 ppm Cal/OSHA <br />TLV-TWA† 10 ppm ACGIH† <br />PEL-TWA 50 ppm Cal/OSHA <br /> <br />PEL-TWA 100 ppm Cal/OSHA <br />STEL 150 ppm <br />†ACGIH –American Conference of Governmental Industrial Hygienist; TLV – Threshold Limit Values for <br />Chemical Substances <br />3.7.2 Tetrachloroethylene (PCE) <br />Type(s)/Source: Possible solvents – Tetrachloroethylene (PCE) <br /> <br />Exposure Route: Inhalation, skin absorption; ref B & C – NIOSH Guides Chemical Hazards <br /> <br />Target Organs: See Attachment C – NIOSH Guides Chemical Hazards <br /> <br />Anticipated Acute <br />Exposure Symptoms: See Attachment C – NIOSH Guides Chemical Hazards <br />Pertinent Physical Properties: liquid, vapors; IP 9.32 eV PCE <br />Qualified Exposure Risk: Low <br />Primary Control: <br /> <br />• Isolation – site control; <br />• Engineering Controls – Water mist to allay potential airborne dust;