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w <br /> LAMMERSVILLE SCHOOL DISTRICT <br /> Site Safety Plan <br /> October 16, 3991 <br /> d. Summary: Do not enter the confined space unless: <br /> r the oxygen concentration is between 19.5 and 23%; <br /> • the LEL is less than 20%; <br /> • PTD 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 person'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 II <br /> HAZARD SUMMARY <br /> PPE AIR MONITORING _ BREATHING ZONE <br /> Job Task Level <br /> Instrument Frequency* <br /> Soil boring D PTD or FID At start of work and <br /> samples 15 min to continuously <br /> Monitoring D PSD 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 FIB Start-up of work at each <br /> Well Development 11 well location <br /> Groundwater Start--up of work at each <br /> and soil sampling D PTD or FID well location. <br /> All air monitoring data must be recorded on the Vapor Monitoring Sheet, <br /> Appendix H. <br /> 12 <br />