Circumstances of non-violations for discharge of waste

(1) A licensee shall not be held to have violated the provisions of section 66 by reason only of the fact that a discharge from a sewer or works vested in it contravenes the conditions of a permit relating to the discharge if, (a) the contravention is attributable to a discharge into the sewer or works caused or permitted by another person; (b) the licensee either was not bound to receive the discharge into the sewer or works or was bound to receive it subject to conditions which were not observed; National Integrated 53 (c) the licensee could not reasonably have been expected to prevent the discharge into the sewer or works., and (d) the discharge occurs under any other circumstances which the Authority may consider is outside the control of the licensee;