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How to use the table of initial isolation and protective action distances

.The responder should already have
1Identified the material by its Name
2Read the Guide for that material and taken the emergency actions recommended
3Noted the wind direction
.Look in this Table, use the entry with the largest protective action distances
.Determine if the incident involves a SMALL or LARGE spill and if DAY or NIGHT. Generally, a SMALL SPILL, is one which involves a single, small package (i.e. up to a 200 liter drum), a small cylinder, or a small leak from a large package. A LARGE SPILL is one, which 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.
.Look up the initial ISOLATION distance
Direct all persons to move, in a crosswind direction, away from the spill to the distance specified.
.Next, look up the initial PROTECTIVE ACTION DISTANCE shown in the Table. For a given dangerous goods, spill size, and whether day or night, the Table gives the downwind distance - in kilometers 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 the Table
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 PIH 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.
Call the emergency response telephone number listed on the TREMCARD as soon as possible for additional information on the material, safety precautions, and mitigation procedures.
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