Section 304.102  Dilution

a)         Dilution of the effluent from a treatment works or from any wastewater source is not acceptable as a method of treatment of wastes in order to meet the standards set forth in this Part.  Rather, it shall be the obligation of any person discharging contaminants of any kind to the waters of the state to provide the best degree of treatment of wastewater consistent with technological feasibility, economic reasonableness and sound engineering judgment.  In making determinations as to what kind of treatment is the "best degree of treatment" within the meaning of this paragraph, any person shall consider the following:

1)         What degree of waste reduction can be achieved by process change, improved housekeeping and recovery of individual waste components for reuse; and

2)         Whether individual process wastewater streams should be segregated or combined.

b)         In any case, measurement of contaminant concentrations to determine compliance with the effluent standards shall be made at the point immediately following the final treatment process and before mixture with other waters, unless another point is designated by the Agency in an individual permit, after consideration of the elements contained in this section.  If necessary the concentrations so measured shall be recomputed to exclude the effect of any dilution that is improper under this Section.