Current through Register Vol. 24-06, March 15, 2024
(1) Any permit
issued by the department shall apply and insure compliance with all of the
following, whenever applicable:
(a) All known,
available, and reasonable methods of treatment required under
RCW
90.52.040,
90.54.020(3)(b),
and 90.48.520; including effluent
limitations established under sections 301, 302, 306, and 307 of the FWPCA. The
effluent limitations shall not be less stringent than those based upon the
treatment facility design efficiency contained in approved engineering plans
and reports or approved revisions thereto. The effluent limitations shall
reflect any seasonal variation in industrial loading. Modifications to
technology-based effluent limitations for specific discharge categories are as
follows:
(i) For combined waste treatment
facilities, the effluent limitations for biochemical oxygen demand or suspended
solids may be adjusted upwards to a maximum allowed by applying effluent
limitations pursuant to sections 301(b)(1)(B) of the FWPCA to the domestic
portion of the influent and effluent limitations pursuant to sections
301(b)(1)(A)(i), 301(b)(2)(A), and 301(b)(2)(E) of the FWPCA or standards of
performance pursuant to section 306 of the FWPCA to the industrial portion of
the influent: Provided, That the following additional condition is met:
Fecal coliform levels shall not exceed a monthly geometric mean
of 200 organisms per 100 ml with a maximum weekly geometric mean of 400
organisms per 100 ml;
(ii)
For municipal water treatment plants located on the Chehalis, Columbia,
Cowlitz, Lewis, or Skagit river, the effluent limitations shall be adjusted, in
accordance with
RCW
90.54.020(3)(b), to reflect
credit for substances removed from the plant intake water if:
(A) The municipality demonstrates that the
intake water is drawn from the same body of water into which the discharge is
made; and
(B) The municipality
demonstrates that no violation of receiving water quality standards or
appreciable environmental degradation will result.
(b) Any more stringent limitation,
including those necessary to:
(i) Meet water
quality standards, treatment standards or schedules of compliance established
pursuant to any state law or regulation under authority preserved to the state
by section 510 of the FWPCA; or
(ii) Meet any federal law or regulation other
than the FWPCA or regulations thereunder; or
(iii) Implement any applicable water quality
standards; such limitations to include any legally applicable requirements
necessary to implement total maximum daily loads established pursuant to
section 303(d) and incorporated in the continuing planning process approved
under section 303(e) of the FWPCA and any regulations and guidelines issued
pursuant thereto;
(iv) Prevent or
control pollutant discharges from plant site runoff, spillage or leaks, sludge
or waste disposal, or materials handling or storage; and
(v) Meet the permit by rule provisions of the
state dangerous waste regulation, WAC
173-303-802(4) or
(5).
(c) Any more stringent legal applicable
requirements necessary to comply with a plan approved pursuant to section
208(b) of the FWPCA; and
(d) Prior
to promulgation by the administrator of applicable effluent standards and
limitations pursuant to sections 301, 302, 306, and 307 of the FWPCA, such
conditions as the department determines are necessary to carry out the
provisions of the FWPCA.
(2) In any case where an issued permit
applies the effluent standards and limitations described in subsection (1)(a)
of this section, the department shall make a finding that any discharge
authorized by the permit will not violate applicable water quality
standards.
(3) In the application
of effluent standards and limitations, water quality standards and other
legally applicable requirements pursuant to subsections (1) and (2) of this
section, each issued permit shall specify:
(a)
For industrial wastewater facilities, average monthly and maximum daily
quantitative mass and/or concentration limitations, or other such appropriate
limitations for the level of pollutants and the authorized discharge;
(b) For domestic wastewater facilities,
average weekly and monthly quantitative concentration and mass limitations, or
other such appropriate limitations for the level of pollutants and the
authorized discharge; and
(c) If a
dilution zone is authorized within which water quality standards are modified,
the dimensions of such dilution zone.
Statutory Authority:
RCW
90.54.020 and
chapter
90.48 RCW. 88-22-059
(Order 88-9), § 173-220-130, filed 11/1/88. Statutory Authority:
RCW
90.48.035 and
90.48.260. 82-24-078 (Order DE
82-39), § 173-220-130, filed 12/1/82; Order DE 74-1, § 173-220-130,
filed 2/15/74.