"Construction Materials" are defined as materials used in a construction and in which the content of calcium, silicium and aluminium together is more than 10 percent. Article 2 provides for analysis of contents of the materials aforementioned in construction materials. Article 3 indicates the competent authorities for purposes of this Regulation. Construction materials may be used only on or in the soil if the compounds of the material are analysed by the competent institution (art. 9). Chapter