FAQ: What do the flags NA, NC, >, #VALUE and DIV/0! mean?

Users of the RBCA Tool Kit may see the following flags in their results.

Value Explanation
NA The NA value indicates that this pathway was not selected
NC The NC value indicates that there is a parameter missing, and so the value was not calculated. The most common cause of this error is missing toxicity values for one of the chemicals of concern.
> This flag indicates that the PCL exceeds the solubility for that particular chemical in the media of interest (air or water). This suggests that a risk-based standard cannot be applied for this chemical using the ASTM RBCA methodology.

This is a fairly common flag. When you get it, you will want to address other issues, such as non-aqueous phase liquids (NAPLs) or other standards, such as aesthetic concerns or local regulations.
DIV/0! This flag indicates a problem with one or several of your input parameters, so that a divide by zero error was generated. Check your inputs. Common causes of this error include missing toxicity values for one of the chemicals of concern or a zero value in the rate constant in the SAM model.
#VALUE! This flag indicates a problem with one or several of your input parameters. Check your input values.