I-9, r. 6 - Code of ethics of engineers

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3.05.06. In carrying out a mandate, the engineer shall generally act only for one of the parties concerned, namely, his client. However, where his professional duties require that he act otherwise, the engineer must notify his client thereof. He shall accept the payment of his fees only from his client or the latter’s representative.
R.R.Q., 1981, c. I-9, r. 3, s. 3.05.06.