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<br />Geocon Project No. S2170-07-12 - 15 - June 6, 2022 <br />Note: Readings exceeding 500 ppm at the sampling point – suspend sampling activities until conditions <br />can be further assessed. If corrective action cannot be taken, site personnel must remain up-wind or <br />move to a predetermined safe area and contact the Project CIH. <br /> <br />The PID shall be calibrated both before and after field operations, or more frequently as deemed <br />necessary by the PSO. The instrument will be calibrated and maintained in accordance with the <br />manufacturer’s instructions. The calibration gas and the calibration readings (in ppm equivalent) shall <br />be recorded in the field log book. <br />It should be noted that high humidity environments can cause a PID instrument to indicate lower <br />organic vapor concentrations than actually exist. <br />4.1.2 Lead <br />Industrial hygiene monitoring will not be performed for inorganic lead sampling tasks being carried out <br />for this project. Previous Negative Exposure Assessments for representative direct-push soil sampling <br />tasks and characterization activities, using similar controls document exposures consistently below the <br />30 µg/m3 Action Level for inorganic lead [ref. T8 CCR §1532.1(d)(5)(A)]. <br />4.2 Personal Hygiene <br />The PSO will establish on-site sanitation procedures which may, depending on site tasks and <br />conditions involve: hand-wash facilities including clean water and hand soap; waterless hand cleaner; <br />sanitary wipes and clean towels at the project site. <br />All Geocon personnel, subcontractor employees, and Clients and their designees leaving the project <br />site (work zones) will clean potential impacted soils from their footwear and follow personal hygiene <br />procedures prior to leaving the project site. In addition, the following procedures will be followed to <br />ensure worker protection against potential exposure through ingestion: <br /> <br />• Eating, drinking, chewing gum or tobacco, smoking, or any practice that increases the <br />probability of hand-in-mouth transfer and ingestion of material is prohibited in any area <br />designated as being potentially impacted. <br />• Hands and face must be thoroughly washed upon leaving the work area, and before eating, <br />drinking, or other non-project activities. <br />• Avoid unnecessary kneeling, sitting, leaning, or general contact with potentially impacted <br />surfaces or with surfaces suspected of being potentially impacted by hazardous materials (i.e., <br />puddles, mud, leachate, etc.).