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` Response Criteria For Airborne Vapor Concentrations <br /> (measured at breathing zone level) <br /> ` READING LEVEL OF PROTECTION <br /> 0 ppm or Background <br /> (as measured up-wind of sampling location) Level D <br /> Background—5 ppm above background <br /> >5 ppm up to 10 ppm above background Level D w/continuous monitoring <br /> >10 up to 300 ppm above background Level C <br /> >300 ppm above background Stop Operations <br /> Move Up-Wind <br /> V <br /> Note: Readings exceeding 500 ppm at the direct-push sampling point — suspend sampling activities <br /> Luntil conditions can be further assessed. If corrective action cannot be taken, site personnel must <br /> remain up-wind or move to a predetermined safe area and contact the Consulting CIH. <br /> The PID shall be calibrated both before and after field operations, or more frequently as deemed <br /> necessary by the Project Manager or SSO. Tie instrument will be calibrated and maintained in <br /> accordance with the manufacturer's instructions The calibration gas and the calibration readings (in <br /> ` ppm equivalent) shall be recorded in the field log book. <br /> ` It should be noted that high humidity enviromrients can cause a PID instrument to indicate lower <br /> organic vapor concentrations than actually exist. <br /> ., 4.3 Personal Hygiene <br /> The SSO will establish hand-wash facilities, including clean water, hand soap, waterless hand cleaner, <br /> sanitary wipes and clean towels at the project site.All Geocon personnel, subcontractor employees, and <br /> Caltrans field inspectors and engineers leaving the project site (work zones) will clean potential <br /> impacted soils from their footwear and wash I ands prior to leaving the project site (ref- T8 CCR <br /> ` <br /> §1527(a)(2)). In addition, the following procedures will be followed to ensure worker protection <br /> against potential exposure through ingestion: <br /> L • Eating, drinking, chewing gum or tobacco, oking, or any practice that increases the probability <br /> of hand-in-mouth transfer and ingestion of aterial is prohibited in any area designated as being <br /> potentially impacted. <br /> V <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, leanmi or general contact with potentially impacted surfaces <br /> or with surfaces suspected of being potent ally impacted by hazardous materials (i.e., puddles, <br /> mud, leachate,etc.). <br /> L <br /> 6. <br /> Linden UST SI and Removal,Task Order No.34 Caltrans Contract 06A1895,EFTS 10-1300-0181-0 <br /> Geocon Project No.59800-01-34 - 16- October 2013,Revised September 2014 <br /> r <br />