NYC 9/11 Public Portal Document
Staten Island Landfill Debris Disposal Operation Health and Safety Program
when ambient weather exceeds 75 degrees Fahrenheit measured as a Wet Bulb Globe
Temperature (WBGT) as defined by the American Conference of Governmental Industrial
Hygienists (ACGIH). Heat stress wll be evaluated based on three fectors accordingly:
WBGT base index determined by environmental data.
Correction of WGBT base index for use of personal protective equipment.
Correction of WBGT base for variations of work loads.
The resulting WBGT index will be used to calculate a Threshold Limit Value (TLV) as described by
the ACGIH, for heat stress. Exceeding the TLV is prohibited, and could result in serious injuryor
death to workers. When applicable, the WBGT will be monitored by industrial hygiene technicians
during both day and night shifts. Data will be evaluated by a Certified Industrial Hygienist (CIH), who
will determine the TLV based on the factors listed in this section. EE&G’s CIH is available to assist
with Heat Stress Monitoring.
Workers should be instructed to periodically monitor their heart rate during periods of high ambient
temperatures, or periods involving heavy work. A maximum, sustained heart rate of 100 beats per
minute should result in the temporary removal of a worker from the exclusion zone.
The primary method of minimizing the adverse effects of heat stress will be through the
implementation of a work/rest regiment, expressed as a percentage of time out of each hour that a
worker can perform their respective task. The unadjusted TLV for heat stress is presented below.
Designated rest areas should be outside of the exclusion zone (no PPE requirements), and should
be in an air-conditioned environment. Temperatures are shown as degrees Fahrenheit (°F):
Workload
Work/rest regiment Light Moderate Heavy
Continuous Work 86 80 77
75% work/25% rest 87 82 78
50% work/50% rest 89 85 82
25% work/75% rest 90 88 86
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NYC-WTC_000150366
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