21The operative part of the contested decision reads as follows:‘Article 11. The State aid in favour of Iberpotash in the form of unduly low guarantee fees resulting from the unduly low level of the guarantees for the period 2006-2016 amounting to EUR 1864622, unlawfully granted by Spain, in breach of Article 108(3) of the Treaty on the Functioning of the European Union, is incompatible with the internal market.2. The State aid for covering Vilafruns waste heap amounting to EUR 3902 461.30 unlawfully granted by Spain, in breach of Article 108(3) of the Treaty on the Functioning of the European Union, in favour of Iberpotash is compatible with the internal market within the meaning of Article 107(3)(c) [of the Treaty on the Functioning of the European Union].3. The remaining part of State aid for covering Vilafruns waste heap amounting to EUR 3985 109.70 unlawfully granted by Spain, in breach of Article 108(3) of the Treaty on the Functioning of the European Union, in favour of Iberpotash is incompatible with the internal market.Article 21. Spain shall recover the aid referred to in Article 1(1) and (3) from the beneficiary.2. The sums to be recovered shall bear interest from the date on which they were put at the disposal of the beneficiaries to the date of their effective recovery.3. The interest shall be calculated on a compound basis in accordance with Chapter V of Commission Regulation (EC) No 794/2004 and with Commission Regulation (EC) No 271/2008 amending Regulation (EC) No 794/2004.4. Spain shall cancel all outstanding payments of the aid referred to in Article 1(1) and (3) with effect from the date of adoption of this decision.Article 31. Recovery of the aid referred to in Article 1(1) and (3) shall be immediate and effective.2. Spain shall ensure that this decision is implemented within four months following the date of notification of this Decision.…’