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Action Levels <br /> Instrument Reading Action <br /> PID or FID Background to 5 ppm Level D <br /> (organic vapors) <br /> 5 ppm to 10 ppm Level C with organic vapor/acid <br /> gas HEPA filter cartridges. Work <br /> will stop until'a qualified Level C <br /> SSC is onsite. <br /> Greater than 10 ppm above Evacuate - consult with BVWST <br /> background DHS <br /> OZ Meter Less than 19.5% 02 Evacuate - consult with BVWST <br /> DHS <br /> 19.5% - 23% 02 Continue activities <br /> Greater than 23% 02 Evacuate; explosion hazard <br /> LEL Meter Up to 5% LEL Continue activities <br /> 5 - 10% LEL Continue; identify source <br /> Greater than 10% LEL Evacuate; explosion hazard <br /> Monitoring_Requirements <br /> ji Ambient air monitoring will be conducted continuously while site <br /> activities are in progress. Monitoring instruments will include the <br /> following: <br /> • HNu (PID) or OVA (FID) for organic vapors <br /> • 02/LEL meter' <br /> The SSC will <br /> take instrument readings at least every 15 minutes, or when <br /> La change in activity occurs or a chemical is detected visually or by odor <br /> and record all values. With the exception of the LEL reading, <br /> upgrade/downgrade decisions will be based on monitoring results in the <br /> breathing zone and the action levels listed above. Calibration and <br /> maintenance of monitoring equipment will be the responsibility of the <br /> SSC and will be conducted in accordance with manufacturer's ' <br /> requirements as listed in the,appropriate manual. Monitoring equipment <br /> will be calibrated at least daily. <br /> 93P22 <br /> 40429200.wp East Bay Municipal Utility District <br /> 29 Work Plan-Stockton Service Center <br />