Perimeter Reconnaissance
At a site in which the hazards are largely unknown, or there is no need to go on-site immediately, the following procedure should be used:
- Make visual observations of the site.
- Monitor the atmospheric concentrations of airborne pollutants at the site perimeter.
- Collect samples near the site.
While these data are not definitive indicators of on-site conditions, they can assist in the preliminary evaluation.
This worker is collecting water samples at the perimeter of the site.
Perimeter reconnaissance of a site should involve the following actions:
- Develop a preliminary site map, with the locations of buildings, containers, impoundments, pits, ponds, and tanks.
- Review historical and current aerial photographs. Note: Disappearance of natural depressions, quarries, or pits. Variation in reforestation of disturbed areas.
- Mounding or uplift in disturbed areas or paved surfaces, or modifications in grade. Changes in vegetation around buildings.
- Changes in traffic patterns at the site.
- Note any labels, markings, or placards on containers or vehicles.
- Note the amount of deterioration or damage of containers or vehicles. Note any biologic indicators, such as dead animals or plants.
- Note any unusual conditions, such as clouds, discolored liquids, oil slicks, vapors, or other suspicious substances.
- Monitor the ambient air at the site perimeter for:
- toxic substances
- combustible and flammable gases or vapors
- oxygen deficiency
- ionizing radiation
- specific materials, if known
- Note any unusual odors.
- Collect and analyze off-site samples including:
- soil
- drinking water
- ground water
- site run-off
- surface water
Knowledge Check Choose the best answer for the question.
1-3. What is one of the procedures you should follow at a site in which the hazards are largely unknown, or there is no need to go on-site immediately?
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