Is it possible to calculate the average existing grade from shot points on the site plan?
Here's an example of what I'm trying to do:
Step 1: Provide an accurate scaled drawing of the building footprint on the site. The drawing must show the existing topography (using contour lines at 2' intervals).
Step 2: Show points on the drawing every 10' around the building footprint. For each point, provide spot elevations of the topography as it exists today.
Step 3: Add up all of the existing grade spot elevations, and divide by the quantity of those spot elevations. This gives you your average existing grade.