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The main focus of the initial monitoring is to rapidly identify immediate hazards and determine background ii concentrations. During drilling, periodic air monitoring will be conducted to evaluate the Ievels of total petroleum hydrocarbons. The LEL meter will primarily be used to detect explosive atmospheres in the storage tanks containing excavation water. Specific operating and calibration requirements for the PI.D and } LEL meter are contained in the instruction manuals accompanying the instruments. 3.5.2 Heat Stress Monitoring The stress of working in a hot environment can cause a variety of illtiesses,;,Ilincluding heat exhaustion or it heat stroke,which can be fatal. Personal protective equipment can significantly increase heat stress. To reduce or prevent heat stress,frequent rest periods and controlled beverage consumption to replace body �y fluids and salts may be required. Additionally, quantitative physiological monitoring for heat stress may be conducted, including heart rate as a primary indicator and oral temperature as a secondary indicator. The frequency of monitoring depends on the ambient temperature and the level of protection used on site. Monitoring should begin when ambient air temperatures reach 75°F. To determine the initial monitoring frequency for Levels C and D protection, 1 after a work period of moderate exertion,the information in Table 2 will befused. Table 2 g. Heat Stress Monitoring Frequenciesr q 3 ' Adjusted Level D PPE level CVPE Tempersturel I 90°F or above after 45 minutes after 15 minutes `. t 87.5°to 90°F after 60 minutes after 30 minutes 82.50 to 87.50 after 90 minutes after 60 minutes 77.50 77.5°to 82.50F after 120 minutes after 90 minutes., 72.50 to 77.5°F after 150 minutes after 120 minutes 4 'k 3 'Adjusted air temperature ff)=observed temp+(13 x percent sunshine) '1 i� Air temperature is measured with a bulb shielded from radiant heat—The following procedures and action levels are to be used for the physiological monitoring of heat stress: • Heart rate: Count the radial pulse during a 30-second period as early as possible in the rest period. If the heart rate exceeds 110 beats per minute at the beginning of;�the rest period, shorten the next work cycle by one-third and keep the rest period the same.i If the:pe rate exceeds the l 10 beats 9 j!