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Chevron U.S.A. Inc. <br /> Site, Safety plan <br /> October 2, 1991 <br /> d. Summary: Do not enter the confined space unless: <br /> ® the oxygen cone(antration is between 19.5 and 23%; <br /> 9 the LEL is less than 20%; <br /> • PID and/or FID readings are less than 750 ppm (a half <br /> face respirator must be worn above 50 ppm; a full face <br /> respirator must be worn if the readings exceed 100 ppm) <br /> e. Buddy System: The buddy system must be used when the work <br /> in the confined space: (1) requires the perron's head to <br /> be below ground level; or (2) the person must work in a <br /> manhole or other space in which an exit may not be easily <br /> accessible. <br /> TABLE Il <br /> HAZARD SUMMARY <br /> PPE AIR MONITORING - BREATHING ZONE <br /> Job Task Level <br /> Instrument Frequency* <br /> Soil boring At start of work and <br /> samples A PID or FID 15 min to continuously <br /> Monitoring D PID or FID At start of work and <br /> Well Installation 15 min to continuously <br /> Monitoring D PID or FID Start--up of work at each <br /> Well Survey well location <br /> Monitoring D PID or FID Start-up of work at each <br /> Well Development well location <br /> Groundwater D PID or FID Start-up of work at each <br /> and soil sampling well location. <br /> All air monitoring data must be recorded on the 'Vapor Monitoring Sheet, <br /> Appendix H. <br /> 12 <br />