=2.= In calculating the cubic yards of earth excavated for the cellar,
all measurements are taken from the foundation plan and the sections.
The plan is blocked out as shown in the accompanying Cellar Plan,
and the area of each block found; then, by multiplying the sum of
these partial areas by the depth of the cellar, the cubic contents is
determined. The trenches for the foundation walls of porches and for
the footings of cellar walls are calculated separately, as also are the
excavations for piers, drains, cesspools, area, etc.