Judgment of the Court (Fifth Chamber) of 8 June 1999 in Case C-198/97: Commission of the European Communities v Federal Republic of Germany (Failure by a Member State to fulfil its obligations - Directive 76/160/EEC - Quality of bathing water - Admissibility of an action brought pursuant to Article 226 EC (ex Article 169) - Reasoned opinion - Observance of the principle of the collegiality of the Commission - Failure to comply with Articles 4(1) and 6(1) of Directive 76/160/EEC)