| (a) Domestic wastewater discharges from wastewater
treatment systems, other than oxidation pond systems, must meet a
daily effluent limit for total phosphorus of 1.0 milligram per liter,
based on a 30-day average, if the wastewater treatment system:
(1) has a permitted annual or daily average flow greater
than or equal to 0.10 million gallons per day and a discharge point
located in the Benbrook Lake water quality area; or
(2) has a permitted annual or daily average flow greater
than or equal to 0.25 million gallons per day and a discharge point
located in the Benbrook Lake watershed, but outside the Benbrook Lake
water quality area.
(b) For discharge permits with more than one flow phase,
the effluent limit requirements in subsection (a) of this section
apply only to those flow phases that meet the flow requirements in
subsection (a) of this section.
(c) For wastewater treatment systems with more than
one outfall, the permitted flow limits for all outfalls will be combined
to determine if the system meets one of the flow requirements in subsection
(a) of this section.
(d) This section only applies to wastewater treatment
systems that apply for a new discharge permit or a discharge permit
amendment to increase permitted flow after January 1, 2015.
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