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Page 14 <br /> • 3 Oxygen Deficient' <br /> Instrument and Date Action Level Frequency/Duration <br /> of Calibration Ambient Au of Air Monrtonn 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 Monitonn Action <br /> Date <br /> Drae er um /tubes <br />• Radiation monitor <br /> Heat stress meter <br /> Noise meter <br /> H2S meter <br /> H anal zer <br /> Others <br /> B. AIR MONITORING FOR UNKNOWN CONTAA41NANTS - For totally unknown <br /> contaminants, the following levels of protection must be utilized. <br /> PID or FID in Breathing Zone <br /> Reading for one minute <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 />• <br /> Parker Environmental Services, 4185 Rialto Court, Pittsburg, CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />