(1)

All site constructed holding tanks shall be inspected after the floor is poured and the keyway and water stop are installed or after the forms for the tank walls have been set but in all instances before any concrete for the walls has been poured.

(2)

Concrete walls may be poured only after it has been determined that the tank, as formed, complies with the approved plans.

(3)

This inspection shall not eliminate the need for an inspection after the installation has been completed.