Article 5
Acting in accordance with Article 15(3) of Directive 91/271/EEC, Portugal shall monitor and carry out other relevant studies to verify that the discharge does not adversely affect the environment. In particular, at least twice a month during the bathing season, samples shall be taken in at least two well-defined points of the receiving waters, one point being located above the eastern diffuser of the discharge and the other one at 200 metres to the west of the western diffuser. At each of these two points, one sample shall be taken at surface level and another at middle depth: of these samples, 80 % shall contain not more than 100 faecal coliforms per 100 millilitres, the analysis being performed by a laboratory having a system of analytical quality control as specified in heading 2 of the Annex to this Decision.