The attainment of the specified levels simply by dilution, in the absence of any treatment (that is, by use of extraneous or other wastewater intermixed to dilute a particular discharge) is specifically prohibited. The mercury level in the effluent stream from the facility in which a waste containing mercury originates shall be measured after treatment and before any extraneous water or wastewater from any other sources has been added.
30 Tex. Admin. Code § 319.24