(2) ensure that the verification referred to in paragraph 1 is performed at the following frequency:(a) in the case of the managers of return sites, including subcontractors, at least 10%, in more than one administrative region, must be verified each year and all must be verified over a 5-year period;
(b) in other cases, the verification must take place during the first full calendar year during which the deposit-refund system is implemented, and at least every 3 years thereafter.