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TABLE 3 <br />Air Monitoring Instrumentation and Action Levels <br />Hazard Instrument Reading Location Action <br />Respiratory PID/Draeger Tube 1-2 ppm Breathing Don Respirator <br />(Modified D) <br />Respiratory PID/Draeger Tube 5 ppm Breathing Don Level C <br />(Protection) <br />Respiratory PID/Draeger Tube 10 ppm Breathing Leave Area <br />Explosion Combust. Gas Meter 10% LEL Ambient Air Vent Area <br />Explosion Combust. Gas Meter 20% LEL Ambient Air Leave Area <br />Oxygen Oxygen Meter 19.5% Oxygen Ambient Leave Area <br />Deficiency Air <br />Apparent exposure level above the background ambient air <br />concentration. Background levels may change due to factors such as <br />weather and location of work site. <br />High efficiency organic vapors cartridges with dust filters shall be <br />used. <br />As each chemical constituent is identified through soil and surface water <br />testing, specific action levels will be determined. These site-specific <br />action levels and any modifications to safety procedures presented in this <br />plan shall be incorporated in future revisions. It is presently <br />anticipated that chemical hazards will warrant the division of the work <br />site into work, decontamination area prior to entering the support area. <br />The support and decontamination area will be upwind of the work site. No <br />visitors shall be allowed to approach the work site unless they are <br />properly trained and under the supervision of delegated Musco Excavators <br />personnel. <br />