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664 HAZWOPER for General Site Workers V
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Required Information

Per 1910.120(c)(4), the following information to the extent available must be obtained by the employer before allowing employees to enter a site:

  • location and approximate size of the site
  • description of the response activity and/or the job task to be performed
  • duration of the planned employee activity
  • site topography and accessibility by air and roads, including:
    • meteorological data, e.g., current weather and forecast, prevailing wind direction, precipitation levels, temperature profiles
    • terrain, e.g., historical and current site maps, site photographs, aerial photographs, U.S. Geological Survey topographic quadrangle maps, land use maps, and land cover maps
  • geologic and hydrologic data
  • habitation-population centers, population at risk
  • chemical and physical properties of expected hazardous substances and health hazards
  • pathways for hazardous substance dispersion
  • present status and capabilities of emergency response teams that would assist on-site employees at the time of an emergency
  • hazardous substances and health hazards involved or expected at the site and their properties

Knowledge Check Choose the best answer for the question.

1-6. Before allowing employees to enter a site what information must the employer first obtain?