(1) All sampling will be done by employees of the bureau. A random sampling of petroleum products of the manufacturer and importer may be made to ensure that proper standards are being met. The bureau may require the cost of testing samples be paid for by the manufacturer or importer.

(2) On complaint of an individual as to standards of a petroleum product, sampling will be made by employees of the bureau. The bureau shall review the complaint and the sampling to determine if an investigation will be conducted into the petroleum product in question.