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6.0 EXPOSURE MONITORING PLAN Heat stress, noise, and chemical exposures may be encountered at this site Heat stress monitoring and prevention is addressed in Section 5 2 1 Noise levels will not be monitored, D&M personnel will wear hearing protection as described in Section 5 2 2 Dames & Moore's exposure monitonng policy and procedure is located in Section HS 180 of the D&M Health and Safety Program Manual, a copy of which shall be maintained on site 6 1 CHEMICAL EXPOSURE MONITORING The field instrumentation described in this health and safety plan has been specifically selected for the contaminants that may be reasonably anticipated to be encountered during this course of this project Selection factors include anticipated airborne concentrations, potential interference, ioruzation potentials, instrument sensitivity, and occupational exposure limits The Action Levels specified in Section 10 were established with the expectation that specific instruments will be used DO NOT SUBSTITUTE INSTRUMENTS WITHOUT THE CONSENT OF THE HSP PREPARER OR THE DSO. The monitoring equipment specified in Section 1 0 will be used on a regular basis to evaluate the potential for exposure to airborne contaminants, typically every five to ten minutes Monitoring will be conducted in the immediate vicinity of the contaminant source point or work area (e g , and the borehole and cuttings adjacent to the borehole) If readings exceed the First Action Level (15 ppm > one minute, or 300 ppm instantaneously), work will stop, and workers will move upwind while the airborne contaminants dissipate If elevated levels remain for more than five minutes, the source of the airborne contamination will be covered with clean soil, plastic sheeting, or foam (or controlled in an appropriate manner) and the DSO or PM will be contacted for further guidance 6 2 BACKGROUND READINGS All direct-reading instrument readings will be evaluated relative to background reading, not "meter zero" Prior to the start of work at each shift, and whenever there is a significant shift in wind direction, instrument readings will be obtained upwind of the site work zone in order to determine the level of"background" readings from local vehicle traffic, emissions from nearby operations unrelated to the site, etc Site readings will be evaluated against these background readings (i e , if an action level is listed as 20 ppm, it is evaluated as 20 ppm above background) The SSO should consult with the DSO regarding the potential health hazards associated with background readings above 5 ppm AMFOREST 2 1 7 17