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u <br /> Page 14 <br /> 3. Oxygen Deficiency <br /> Instrument and Date Action Level FrequenTuration <br /> of Calibration (Ambient Air) of Air Monitoring Action <br /> 02 meter Less than 19.5% 02 Do not enter <br /> More than 23% 02 <br /> 3. Other Instruments <br /> Instrument and Date Action Level Frequency/Duration <br /> of Calibration Ambient Air of Air Monitoring Action <br /> Date <br /> Draeger um /tubes <br /> Radiation monitor <br /> Heat stress meter <br /> Noise meter <br /> H2S meter <br /> H analyzer <br /> Others <br /> B. AIRK MONITORING FOR UNKNOWN CONTAMIN S -For totally unknown <br /> contaminants, the following levels of protection must be utilized. <br /> PID or FID in Breathing Zone <br /> Reading for one Ujinute <br /> Background Level D <br /> >0- 5 ppm above background Level C <br /> 5 - 500 ppm above background Level B <br /> 500 - 1,000 ppm above background Level A <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />