PULP MILLS (JUDGMENT) 51 programme of operations might significantly impair navigation, the régime of the river or the quality of its waters, the technical reasons on which this conclusion is based and the changes suggested to the plan or programme of operations. Article 12 Should the parties fail to reach agreement within 180 days following the notification referred to in Article 11, the procedure indicated in Chapter XV shall be followed.” 81. The original Spanish text of Article 7 of the 1975 Statute reads as follows : “La parte que proyecte la construcción de nuevos canales, la modificación o alteración significativa de los ya existentes o la realización de cualesquiera otras obras de entidad suficiente para afectar la navegación, el régimen del Río o la calidad de sus aguas, deberá comunicarlo a la Comisión, la cual determinará sumariamente, y en un plazo máximo de treinta días, si el proyecto puede producir perjuicio sensible a la otra parte. Si así se resolviere o no se llegare a una decisión al respecto, la parte interesada deberá notificar el proyecto a la otra parte a través de la misma Comisión. En la notificación deberán figurar los aspectos esenciales de la obra y, si fuere el caso, el modo de su operación y los demás datos técnicos que permitan a la parte notificada hacer una evaluación del efecto probable que la obra ocasionará a la navegación, al régimen del Río o a la calidad de sus aguas.” The Court notes that, just as the original Spanish text, the French translation of this Article (see paragraph 80 above) distinguishes between the obligation to inform (“comunicar”) CARU of any plan falling within its purview (first paragraph) and the obligation to notify (“notificar”) the other party (second paragraph). By contrast, the English translation uses the same verb “notify” in respect of both obligations. In order to conform to the original Spanish text, the Court will use in both linguistic versions of this Judgment the verb “inform” for the obligation set out in the first paragraph of Article 7 and the verb “notify” for the obligation set out in the second and third paragraphs. The Court considers that the procedural obligations of informing, notifying and negotiating constitute an appropriate means, accepted by the Parties, of achieving the objective which they set themselves in Article 1 of the 1975 Statute. These obligations are all the more vital when a shared resource is at issue, as in the case of the River Uruguay, which can only be protected through close and continuous co-operation between the riparian States. 82. According to Argentina, by failing to comply with the initial obligation (Article 7, first paragraph, of the 1975 Statute) to refer the matter 41