Any general permit issued by the department shall apply and insure compliance with all of the following, whenever applicable:

(1) Technology-based treatment requirements and standards reflecting all known, available, and reasonable methods of prevention, treatment, and control required under RCW 90.48.010, 90.48.520, 90.52.040, and 90.54.020 may be imposed through any or all of the following methods:

(a) Effluent limitations and standards promulgated pursuant to sections 301, 302, 306, and 307 of the FWPCA;

(b) Discharge standards contained in chapters 173-221 and 173-221A WAC;

(c) On a case-by-case basis under section 402 of the FWPCA; and/or

(d) Through the use of best management practices.

(2) Water quality-based effluent limitations.

(a) Water quality-based effluent limitations shall be incorporated into a general permit if such limitations are necessary to comply with chapter 173-200 and/or 173-201A WAC for the majority of the dischargers intended to be covered under the general permit and:

(i) The department determines that the use of a general permit rather than individual permits is appropriate; and

(ii) The conditions of coverage contained in WAC 173-226-050 are met.

(b) Water quality-based effluent limitations must control all pollutants or pollutant parameters which the department determines are or may be discharged at a level which will cause, have the reasonable potential to cause, or contribute to an excursion of state ground or surface water quality standards.

(3) Any more stringent limitations or requirements, including those necessary to:

(a) Meet water quality standards, sediment 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;

(b) Meet any federal law or regulation other than the FWPCA or regulations thereunder;

(c) Implement 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;

(d) Prevent or control pollutant discharges from plant site runoff, spillage or leaks, sludge or waste disposal, or materials handling or storage;

(e) Meet the permit by rule provisions of the state dangerous waste regulation, WAC 173-303-802 (4) or (5);

(f) Comply with a plan approved pursuant to section 208(b) of the FWPCA; and/or

(g) Meet such conditions as the department determines are necessary to carry out the provisions of the FWPCA, prior to promulgation by the administrator of applicable effluent standards and limitations pursuant to sections 301, 302, 306, and 307 of the FWPCA.

(4) In addition to the other applicable requirement of this chapter, general permits authorizing the discharge into a municipal sewerage system shall satisfy the applicable pretreatment requirements of the FWPCA.

(5) Requirements pursuant to other laws, including the state's Hazardous Waste Management Act (chapter 70.105 RCW), the Solid Waste Management—Reduction and Recycling Act (chapter 70.95 RCW), the Resource Conservation and Recovery Act of 1976 (Public Law 95.190), or any other applicable local ordinances, state or federal statute, to the extent that they pertain to the prevention or control of waste discharges into the waters of the state;

(6) In the application of effluent standards and limitations, water and sediment quality standards and other legally applicable requirements pursuant to subsections (1) through (4) of this section, each general 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;

(c) If a dilution zone is authorized, pursuant to chapter 173-201A WAC, within which water quality standards are modified, the dimensions of such dilution zone; and

(d) If a sediment impact zone is authorized within which sediment quality standards are modified pursuant to chapter 173-204 WAC, the dimensions of such sediment impact zone.