Inspection of construction work shall be conducted by a registered professional engineer experienced in the construction of levees and channel modifications and responsible directly to the owner. Continuous daily inspections shall be made and may be delegated to a qualified technician (inspector) provided he or she is under the supervision of the owner's engineer. The executive director may make periodic inspections for the purpose of ascertaining compliance with approved plans and specifications. Such inspections shall be at the expense of the commission. The executive director shall require the owner, at his or her expense, to perform necessary work or tests and to disclose information sufficient to enable the executive director to determine that conformity with approved plans and specifications is accomplished.