Which component is NOT a requirement for the site map according to storm water regulations?

A site map is a critical component of storm water management plans as it provides detailed information about the layout and features of a facility that influence storm water runoff. According to storm water regulations, the site map must include certain elements that help in assessing how water flows across a site and how different structures will interact with storm water.

The correct answer identifies that the area of parking lots is not mandated to be included on the site map. While knowing where parking lots are located can be beneficial for understanding potential runoff impacts, regulations focus specifically on elements that directly affect the management of storm water.

Conversely, secondary containment structures, structural runoff controls, and areas of vegetation are all essential components that aid in storm water management. Secondary containment structures are vital for preventing the release of pollutants; structural runoff controls are necessary for managing the quality and quantity of runoff; and areas of vegetation can be crucial for filtering pollutants and reducing runoff speed. Therefore, while parking lots are relevant to storm water management, their specific inclusion on the site map is not required by regulations, unlike the other elements mentioned.