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DETERMINATION OF THE INITIAL WORK/REST CYCLES ' Measure the airm to perature with a standard thermometer with the bulb shielded from radiant heat, this yields T (actual) Estimate the fraction of sunshine by fudging what percent time the sun is not shielded by clouds that are thick enough to produce a shadow. 100 percent sunshine - no cloud cover = 1 0; 50 percent sunshine - 50 percent cloud cover = 0 5, 0 percent sunshine - full cloud cover = 0 0 Plug these variables into the following equation to determine the adjusted temperature 1 p T (adjusted) = T (actual) + (13 x fraction sunshine) Use the chart below to determine the length of the first work shift At the first break, initiate 1 the heart rate monitoring as described in the next section INITIAL WORK/MONITORING CYCLES ADJUSTED TEMPERATURE NORMAL WORK CLOTHES PROTECTIVE CLOTHING 1 90"F (32.2°C) or above After each 45 minutes of work After each 15 minutes of work 87.5°-90"F (30.8°-32.2°C) After each 60 minutes of work After each 30 minutes of work 82 5"-87.5-F (28.1°-30.8°C) After each 90 minutes of work After each 60 minutes of work TT.S 82.5°F (25 3°-28.1°C) After each 120 minutes of work After each 90 minutes of work 72.50-77 5"F (22.50-25 3°C) After each 150 minutes of work After each 120 minutes of work TEMPERATURE Monitor oral body temperature to determine if employees are adequately dissipating heat buildup Ear probe thermometers which are adjusted to oral temperature are convenient and the preferred method of measurement EPA/OSHA guidelines are as follows 1 Use a clinical thermometer (3 minutes under the tongue) to measure oral temperature at the end of the work period before drinking 2 If temperature exceeds 99 60 F , shorten the following work period by 1/3 without changing the rest period 3 If temperature still exceeds 99 6° F , shorten the following work period by 1/3 ' 4 Do not allow a worker to wear impermeable PPE when his/her oral temperature exceeds 100 6°F