Member States may, by legislative or regulatory provision, authorize derogations from Article 8 (2), Article 9 (1) (b), Article 10 (1) (b) and, in the case of adolescents, Article 12, for work in the circumstances referred to in Article 5 (4) of Directive 89/391/EEC, provided that such work is of a temporary nature and must be performed immediately, that adult workers are not available and that the adolescents are allowed equivalent compensatory rest time within the following three weeks.