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<br />Geocon Project No. S2170-07-12 - 13 - June 6, 2022 <br />• Follow safe work practices and sampling procedures; <br />• PPE – eye (safety glasses or goggles) and, <br />hand protection (leather and/or impermeable gloves) <br />• Sanitation – good personal hygiene; see Section 4.2 <br /> <br />CHEMICAL NAME & CAS# ROUTES OF ENTRY PUBLISHED EXPOSURE LIMITS <br />CATEGORY CONCENTRATION SOURCE <br />Tetrachloroethylene, Inhalation <br />Perchlorethylene (PCE) <br />127-18-4 <br />PEL-TWA‡ 25 ppm Cal/OSHA <br />PEL-STEL 100 ppm <br />PEL-Ceiling 300 ppm <br />TLV-TWA† 25 ppm ACGIH <br />TLV-STEL (15 min.) 100 ppm <br />‡PEL-TWA – Permissible Exposure Limit; TWA - 8-hour time-weighted average concentration adopted by <br />Cal/OSHA. <br />†TLV-TWA - Threshold Limit Values for Chemical Substances 2015 published by the ACGIH – American <br />Conference of Governmental Industrial Hygienist. <br />3.7.3 Lead <br />The risk of significant exposure to inorganic lead is considered low while performing direct-push soil <br />and groundwater sampling. Sampling methods and work practices to be employed will reduce the <br />potential for airborne exposures above the 30 μg/m3 Action Level (AL) for inorganic lead. <br />Detailed information regarding the physical description of lead, including health hazards, routes of <br />entry into the body, signs and symptoms of exposure, and target organs are published in Attachment D <br />– T8 CCR §1532.1 Lead Appendix A. <br /> <br />Types/Source: Historic automotive fuel additive. <br />Exposure Routes: Inhalation & ingestion; ref. Attachment D - T8 CCR §1532.1 Lead – <br />Appendix A <br />Qualified Exposure Risk: Low, due to wet sampling methods and/or moist soil conditions <br />Exposure Controls: Wet methods and adherence to specific sampling methods and procedures. <br /> <br />Based on Negative Exposure Assessments from industrial hygiene monitoring for inorganic lead <br />performed for representative direct-push soil sampling tasks using similar controls, airborne <br />concentrations are expected to be well below the 30 microgram per cubic meter (µg/m3) Action Level <br />[ref. T8 CCR §1532.1(d)]. <br /> <br />• Avoid contact with, and inhalation of, airborne contaminated soil/dust. <br />• PPE (Gloves) <br />• Follow good personal hygiene practices (see Section 4.2). <br />