For a non-dedicated tanker, if a Certificate of Cleaning is utilized to ensure no cross contamination, does verification of cleaning need to be performed?

This is addressed in Section 7.2, which states, if bulk deliveries are made in non dedicated
tankers, there should be assurance of no cross contamination from the tanker. Means of
providing this assurance could include one or more of the following: certification of cleaning,
testing for trace impurities, audit of the supplier.