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Health and Safety Plan <br /> 1319 & 1327 South Madison Street, Stockton, CA <br /> 432770 <br /> 6.1 Action Level Guidance <br /> 6.1.1 Air Monitoring Action Response Limits <br /> This HASP addresses site-specific chemicals as noted in Section 3.1 entitled "Chemicals of <br /> Concern". An action level for each chemical or group of chemicals is based on 50% of the most <br /> restrictive (lowest) occupational exposure limit, specifically the PEL or TWA. If a sustained PID <br /> measurement (i.e., over a 3-minute period) for total CVOCs was observed in the worker's <br /> breathing zone above the action level, site personnel will immediately don respiratory protection. <br /> Full face air purifying respirators (APRs) or half face APRs with combination cartridges equipped <br /> for both particulates and organic vapors protection will be utilized. Due to the limited area of <br /> subsurface disturbance (i.e., 2-inch borehole), dust is not expected to be a concern during the <br /> course of work. <br /> Table 10: General Action Levels <br /> Action Permissible Exposure <br /> Compound Limit (PEL) Time <br /> Level Weighted Average (TWA) <br /> Volatile Organic Compounds (VOCs) 0.5 ppm <br /> (sustained) 1 ppm <br /> 6.1.2 Combustible Gas Indicator (CGI) Oxygen Meter <br /> Action levels for situations involving a combustible Gas Indicator/ Oxygen meter are outlined in <br /> Table 11 below but LEL and oxygen hazards are not anticipated during the current planned Site <br /> work. It is not anticipated that an oxygen deficient or explosive atmosphere will be present during <br /> the planned site work. <br /> Table 11: Combustible Gas Indicator (CGI) Oxygen Meter <br /> Meter Response Action/Respiratory Protection <br /> CGI response <10% LEL Continue normal operations with regular, periodic <br /> monitoring <br /> CGI response > 10% LEL Discontinue operations; evacuate personnel and prohibit <br /> entry; allow to vent until readings are <10%. <br /> Oxygen level <19.5% or Retreat from work area; consult with PM and SSO about <br /> >23.5% upgrading to Level B respiratory protection, adding <br /> mechanical ventilation, or possible changes in work <br /> practices. <br /> 6.1.3 Odors <br /> If strong unexpected and unidentified odors are encountered, site personnel shall evacuate the <br /> area until an assessment of the origin and composition of the odor has been completed, and a <br /> control solution has been implemented. <br /> Page 8 <br />