When trenches are opened for the laying of building
sewer pipes, such trenches shall be inspected by the Enforcement Officer
before the trenches are filled; and the person performing such work
shall notify the Enforcement Officer when the installation of the
building sewer is completed. The filling of a trench before inspection
is made will subject the person to whom the permit is issued to an
additional charge of $15 for each extra trip the inspector has to
make because the trench had to be reopened.