The categories that must appear on the site map do not include which of the following?

The site map is an essential component of stormwater management plans, as it provides a visual representation of various features on the site that can affect stormwater runoff and potential contamination. Among the categories that are typically required to be included on the site map are non-storm water discharge points, outlines of drainage areas, and significant material storage locations.

Including non-storm water discharge points helps operators understand where other discharges may occur that could affect water quality. Outlines of drainage areas are crucial for identifying how water flows across the site and where it might concentrate and flow off-site. Significant material storage locations need to be marked as they indicate potential sources of contamination during storm events.

Dimensions of buildings, while informative for understanding the layout of a site, do not directly relate to stormwater management needs as outlined in most regulatory requirements. Thus, while they can provide context, they are not required on the site map in the same way as the other listed elements. This makes them the correct answer for what categories do not need to appear on the site map.