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NATIONAL ADVERTISING COMPANY- ADDITIONAL SUBSURFACE INVESTIGATION HEALTH AND SA FET!' PLAN 7.3 HEAT STRESS MONITORING . The prevention of heat stress-related accidents/illnesses is best performed through continuous observation of employees and routine heat stress awareness training activities. Heat stress monitoring can be accomplished using one of the techniques discussed below. Any results obtained from monitoring techniques should be used as guidance only. To properly mitigate the effects of heat stress, it is necessary to establish a work routine that incorporates adequate rest periods to allow workers to remove protective clothing, drink fluids (vital when extreme sweating is occurring), rest and recover. The frequency and length of such work breaks must be determined by the individual work location supervisor based upon factors such as the ambient temperature and sunshine, the amount of physical labor being performed, the physical condition of the workers, and protective clothing being used. While heat stress measurement techniques provide' guidance in optimizing this',routine, breaks must always be sufficient to prevent workers from manifesting symptoms of heat stress regardless of monitoring results. 7.3.1 Instrument Measurements Wet Bulb Globe Temperature (WBGT) can be used to determine the heat stress index, in accordance with the techniques specified in the most recent edition of the Threshold Limit Values and Biological Exposure Indices, published by the American Conference of Governmental Industrial Hygienists (ACGIH). WBGT results should be used in conjunction with the Threshold Limit Values and Corrections specified in the Heat Stress Section of the ACGIH document. 7.3.2 Observations In the absence of WBGT monitoring devices, heat stress observations/monitoring may be accomplished by implementing a series of field medical observations. Most commonly used is the observation of L sustained pulse rates. The ACGIH recommends that individuals under 35 years old whose sustained heart rate exceeds 160 beats per minute (bpm) and 140 bpm for those over 35 discontinue work activities until the observed heart rate returns to normal. 7.4 MAINTENANCE AND CALIBRATION OF EQUIPMENT All monitoring equipment will be maintained and calibrated in accordance with manufacturer recommendations. All pertinent data will be logged in a health .and safety logbook and maintained on-site for the duration of site activities. Calibration of all monitoring equipment will be performed daily. 7.5 REPORTING SAMPLING RESULTS Where personal sampling is performed, the Earth Tech Health and Safety Department._will be responsible for informing employees and subcontractors of their monitoririg results to comply with OSHA regulations and good occupational health practices. Within 5 working days after the receipt of monitoring results; the Health and Safety Department will notify each employee, in writing, of the results -which represent that employee's exposure. Where results indicate that employee exposure exceeds the PELs, notification shall be provided to affected employee stating that the PEL was exceeded, and providing -a description of the corrective action(s) taken to control the exposure. Results of monitoring for other hazardous and harmful physical agents shall also be reported to employees in'the same manner. hslprojsuplcominachasp.doc 7-3 02/09/98