(1) Inspection Visits. All site constructed 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 have been poured.

(2) Approval prior to Concrete being Poured. Concrete walls may be poured only after it has been determined that the tank, as formed, complies with the state approved plans.

(3) Final Tank Inspection. A final return inspection shall be required to determine completion and compliance with the installation. [Code § 15.05-2.]