Lesson 3/Learning Event 1
Process Chemical Contamination Data
Units will report chemical contamination information to the next higher headquarters using the NBC 4
(Chemical) Report. The data needed by the NBCE to outline the area of contamination can usually be
obtained from these reports.
When sufficient information is not available to accurately define the limits of contamination, the NBCE
can request that a chemical survey be conducted of that area. The survey may be conducted by
personnel from a unit within or near the attack location. The results of the survey are then forwarded to
As information on chemical contamination is received by the NBCE, it is immediately posted to the
situation map. Figure 26 shows an example of a typical NBC 4 (Chemical) Report of a contaminated
area. Figure 27 on page 97 shows the area represented by this report.
After all available contamination information has been posted, a decision must be made on whether
there is one large area of contamination or several smaller ones. When sufficient information is received
to delineate the contamination boundary, the plotted points are then connected with a solid yellow
contour line to show the entire area of contamination.
FIGURE 26. NBC 4 (CHEMICAL) REPORT AND PLOT.