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  5. Table 1 - Initial Isolation and Protective Actions Distances

Table 1 - Initial Isolation and Protective Actions Distances

  1. The responder should already have:
    • Identified the material by its ID Number and Name; (if an ID Number cannot be found, use the Name of Material index in the blue-bordered pages to locate that number.)
    • Found the three-digit guide for that material in order to consult the emergency actions recommended jointly with this table;
    • Noted the wind direction.
  2. Look in Table 1 (the green-bordered pages) for the ID Number and Name of the Material involved in the incident. Some ID Numbers have more than one shipping name listed - look for the specific name of the material. (If the shipping name is not known and Table 1 lists more than one name for the same ID Number, use the entry with the largest protective action distances.)
  3. Determine if the incident involves a Small or Large spill and if Day or Night. A Small Spill consists of a release of less than 208 liters (55 US gallons). This generally corresponds to a spill from a single small package (e.g. a drum), a small cylinder, or a small leak from a large package. A Large Spill consists of a release of more than 208 liters (55 US gallons). This usually involves a spill from a large package, or multiple spills from many small packages. Day is any time after sunrise and before sunset. Night is any time between sunset and sunrise.
  4. Look up the Initial Isolation Distance. This distance defines the radius of a zone (Initial Isolation Zone) surrounding the spill in ALL DIRECTIONS. Within this zone, all public should be evacuated (protective clothing and respiratory protection is required in this zone). Persons should be directed to move out of the zone in a direction perpendicular to wind direction (crosswind), and away from the spill, to a minimum distance as prescribed by the Initial Isolation Distance.

    Image describing Initial Isolation Distance

  5. Look up the initial PROTECTIVE ACTION DISTANCE. For a given material, spill size, and whether day or night, Table 1 gives the downwind distance - in kilometers and miles - from the spill/leak source for which protective actions should be considered. For practical purposes, the Protective Action Zone (i.e., the area in which people are at risk of harmful exposure) is a square, whose length and width are the same as the downwind distance shown in Table 1. Protective actions are those steps taken to preserve the health and safety of emergency responders and the public. People in this area should be evacuated and/or sheltered-in-place.
  6. Initiate Protective Actions to the extent possible, beginning with those closest to the spill site and working away from the site in the downwind direction. When a water-reactive TIH (PIH in the US)-producing material is spilled into a river or stream, the source of the toxic gas may move with the current or stretch from the spill point downstream for a substantial distance.

    The shape of the area in which protective actions should be taken (the Protective Action Zone) is shown in this figure. The spill is located at the center of the small circle. The larger circle represents the INITIAL ISOLATION zone around the spill.

Image describing Protective Action Distance
NOTE 1:
See "Introduction To Green Tables - Initial Isolation And Protective Action Distances" under Factors That May Change the Protective Action Distances
NOTE 2:
When a product in Table 1 has the mention "(when spilled in water)", refer to Table 2 - Water-Reactive Materials which Produce Toxic Gases for the list of gases produced when these materials are spilled in water.

Call the emergency response telephone number listed on the shipping paper or the appropriate response agency as soon as possible for additional information on the material, safety precautions and mitigation procedures.

Change to imperial units

Small Spills
(From a small package or small leak from a large package)
Large Spills
(From a large package or from many small packages)
First Isolate in all directionsThen Protect persons Downwind duringFirst Isolate in all directionsThen Protect persons Downwind during
DayNightDayNight
IDName of Materialmkmkmmkmkm
  2478   Isocyanate solution, flammable, toxic, n.o.s.600.81.84004.37
  2478   Isocyanates, flammable, poisonous, n.o.s.600.81.84004.37
  2478   Isocyanates, flammable, toxic, n.o.s.600.81.84004.37
  2480   Methyl isocyanate1501.54.4100011.0+11.0+
  2481   Ethyl isocyanate15025.1100011.0+11.0+
  2482   n-Propyl isocyanate1001.32.76007.110.8
  2483   Isopropyl isocyanate1001.438008.411.0+
  2484   tert-Butyl isocyanate600.81.84004.37
  2485   n-Butyl isocyanate600.61.22002.64
  2486   Isobutyl isocyanate600.61.12002.54
  2487   Phenyl isocyanate600.81.33003.14.6
  2488   Cyclohexyl isocyanate300.30.41000.91.3
  2495   Iodine pentafluoride (when spilled in water)300.10.51001.14.1
  2521   Diketene, stabilized300.10.1300.30.4
  2534   Methylchlorosilane300.10.31000.61.4
  2548   Chlorine pentafluoride1000.52.58005.211.0+
  2600   Carbon monoxide and Hydrogen mixture, compressed300.10.22001.24.4
  2600   Hydrogen and Carbon monoxide mixture, compressed300.10.22001.24.4
  2605   Methoxymethyl isocyanate300.30.510011.5
  2606   Methyl orthosilicate300.20.3600.60.9
  2644   Methyl iodide300.10.2600.30.6
  2646   Hexachlorocyclopentadiene300.10.1300.30.4
  2668   Chloroacetonitrile300.10.1300.30.4
  2676   Stibine600.31.62001.24.2
  2691   Phosphorus pentabromide (when spilled in water)300.10.1300.20.7
  2692   Boron tribromide (when spilled on land)300.10.2300.20.4
  2692   Boron tribromide (when spilled in water)300.10.3600.51.7
  2740   n-Propyl chloroformate300.10.3600.51
  2742   sec-Butyl chloroformate300.10.2300.40.5
  2742   Chloroformates, poisonous, corrosive, flammable, n.o.s.300.10.2300.40.5
  2742   Chloroformates, toxic, corrosive, flammable, n.o.s.300.10.2300.40.5
  2742   Isobutyl chloroformate300.10.1300.30.4
  2743   n-Butyl chloroformate300.10.1300.30.4
  2806   Lithium nitride (when spilled in water)300.10.4600.61.9
  2810   Buzz (when used as a weapon)600.41.74002.28.1
  2810   BZ (when used as a weapon)600.41.74002.28.1
  2810   CS (when used as a weapon)300.10.61000.41.9
  2810   DC (when used as a weapon)300.10.6600.41.8
  2810   GA (when used as a weapon)300.20.21000.50.6
  2810   GB (when used as a weapon)600.41.14002.14.9
  2810   GD (when used as a weapon)600.40.73001.82.7
  2810   GF (when used as a weapon)300.20.31500.81
  2810   H (when used as a weapon)300.10.1600.30.4
  2810   HD (when used as a weapon)300.10.1600.30.4
  2810   HL (when used as a weapon)300.10.31000.51
  2810   HN-1 (when used as a weapon)600.30.52001.11.8
  2810   HN-2 (when used as a weapon)600.30.63001.32.1
  2810   HN-3 (when used as a weapon)300.10.1600.30.3
  2810   L (Lewisite) (when used as a weapon)300.10.31000.51
  2810   Lewisite (when used as a weapon)300.10.31000.51
  2810   Mustard (when used as a weapon)300.10.1600.30.4
  2810   Mustard Lewisite (when used as a weapon)300.10.31000.51
  2810   Sarin (when used as a weapon)600.41.14002.14.9
  2810   Soman (when used as a weapon)600.40.73001.82.7
  2810   Tabun (when used as a weapon)300.20.21000.50.6
  2810   Thickened GD (when used as a weapon)600.40.73001.82.7
  2810   VX (when used as a weapon)300.10.1600.40.3
  2811   CX (when used as a weapon)600.21.12001.25.1
  2826   Ethyl chlorothioformate300.10.2300.40.5
  2845   Ethyl phosphonous dichloride, anhydrous300.30.71001.32.3
  2845   Methyl phosphonous dichloride300.411501.93.5
  2901   Bromine chloride1000.51.88004.510
  2927   Ethyl phosphonothioic dichloride, anhydrous300.10.1300.20.2
  2927   Ethyl phosphorodichloridate300.10.1300.30.3
  2977   Radioactive material, Uranium hexafluoride, fissile (when spilled in water)300.10.4600.52.1
  2977   Uranium hexafluoride, radioactive material, fissile (when spilled in water)300.10.4600.52.1
  2978   Radioactive material, Uranium hexafluoride, non fissile or fissile-excepted (when spilled in water)300.10.4600.52.1
  2978   Uranium hexafluoride, radioactive material, non fissile or fissile-excepted (when spilled in water)300.10.4600.52.1
  2985   Chlorosilanes, flammable, corrosive, n.o.s. (when spilled in water)300.10.2600.51.6
  2986   Chlorosilanes, corrosive, flammable, n.o.s. (when spilled in water)300.10.2600.51.6

” + ” means distance can be larger in certain atmospheric conditions

Date Modified:
2016-08-25