Source: https://app.leg.wa.gov/WAC/default.aspx?cite=246-272B&full=true
Timestamp: 2020-07-12 23:53:42
Document Index: 594323555

Matched Legal Cases: ['§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246', '§ 246']

PDF246-272B-01000
(1) The purpose of this chapter is to protect public health and the environment by establishing a comprehensive framework for statewide management of LOSS.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-01000, filed 5/25/11, effective 7/1/11.]
PDF246-272B-01100
The following acronyms and definitions apply throughout this chapter unless the context clearly requires otherwise:
(17) "Domestic sewage" means urine, feces, and the water carrying human wastes, including kitchen, bath, and laundry wastes from residences, nonresidential buildings such as churches or schools, commercial establishments, or other buildings, excluding industrial wastewater and stormwater.
(22) "Drywell" means a subterranean pit, chamber, or structure used to collect stormwater, effluent, or other liquid and disperse it into the soil.
(42) "Industrial wastewater" means the water or liquid carried waste from an industrial process. This waste may result from any process or activity of industry, manufacture, trade, or business; from the development of any natural resource; or from animal operations such as feedlots, poultry houses, or dairies. The term includes contaminated stormwater and leachate from solid waste facilities.
(65) "On-site sewage system (OSS)" means an integrated system of components, located on or nearby the property it serves, that conveys, stores, treats, and provides subsurface soil treatment and disposal of domestic sewage. It consists of a collection system, a treatment component or treatment sequence, and a drainfield. It may or may not include a mechanical treatment system. An OSS also refers to a holding tank sewage system or other system that does not have a drainfield. A holding tank that discharges to a sewer is not included in the definition of OSS. A system into which stormwater or industrial wastewater is discharged is not included in the definition of OSS.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-01100, filed 5/25/11, effective 7/1/11.]
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(1) Persons may not install or operate a LOSS without an operating permit as provided in this chapter.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-01300, filed 5/25/11, effective 7/1/11.]
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(1) The owner may not begin construction until receiving the department's written approval to construct.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-02350, filed 5/25/11, effective 7/1/11.]
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Operating permit requirements and conditions.
(1) The department shall issue a LOSS operating permit for the LOSS and owner named in the application.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-02700, filed 5/25/11, effective 7/1/11.]
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Site review—Inspection.
(1) The owner shall prepare test pits that are open and available for inspection, and meet the requirements of WAC 246-272B-03400.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-03100, filed 5/25/11, effective 7/1/11.]
PDF246-272B-03200
Environmental review—Site risk survey.
At a minimum, the SRS must include the following information:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-03200, filed 5/25/11, effective 7/1/11.]
PDF246-272B-03300
Environmental review—Hydrogeology report.
(1) The department will determine the scope of the HGR based on the site conditions identified in the SRS, if one has been completed.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-03300, filed 5/25/11, effective 7/1/11.]
PDF246-272B-03400
PDF246-272B-03500
(1) To manage nutrient loading, and in addition to any nutrient reduction treatment required by the department based on the SRS or HGR prepared under WAC 246-272B-03200 and 246-272B-03300, the owner shall dedicate a minimum land area for the total development served by the LOSS and the LOSS drainfield.
Finest Textured Soil Type Within the Vertical Separation
Maximum Effluent, gpd Per Acre
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-03500, filed 5/25/11, effective 7/1/11.]
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The O&M manual must include the following information:
(1) Name, telephone number, fax number, mailing address, and email address for the following:
(3) Copies of LOSS legal documents including, but not limited to, the management contract;
(b) Flow metering reading;
(c) Recommended component settings;
(d) Process control information;
(e) Periodic facilities inspection to verify efficiency of operation, adequacy of performance, and general condition of the equipment and components;
(f) Periodic inspection of scum and sludge levels and the integrity of LOSS sewage tanks and tanks on individual lots and cleaning filters, pumping tanks, or making repairs as needed;
(g) Periodic maintenance of pumps, motors, and switches;
(h) Periodic calibration of sampling and measuring devices;
(i) Replacement or repair of worn or damaged equipment;
(j) Methods that provide dosing and resting cycles for the drainfield; and
(k) Other maintenance activities as needed, depending on the type of system.
(9) Ongoing component testing methods and schedules;
(16) Initial component testing information submitted with the final O&M manual, including:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-04200, filed 5/25/11, effective 7/1/11.]
PDF246-272B-04300
Monitoring and reporting plan.
At a minimum, the monitoring and reporting plan must include:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-04300, filed 5/25/11, effective 7/1/11.]
PDF246-272B-04400
(1) Construction plans and specifications must be clear and detailed documents and in an electronic format acceptable to the department.
(ii) All prefabricated tanks must meet the requirements of chapter 246-272C WAC.
[Statutory Authority: RCW 70.118B.020 and 70.118B.040. WSR 19-10-014, § 246-272B-04400, filed 4/22/19, effective 5/23/19. Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-04400, filed 5/25/11, effective 7/1/11.]
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Installer qualifications and responsibilities.
The installer shall:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-05000, filed 5/25/11, effective 7/1/11.]
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Construction oversight and testing.
The design engineer or the engineer's authorized representative shall:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-05100, filed 5/25/11, effective 7/1/11.]
PDF246-272B-05200
Water tightness testing of sewage tanks.
The design engineer shall verify that all sewage tanks used in the LOSS are tested for water tightness by either vacuum testing or water-pressure testing.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-05200, filed 5/25/11, effective 7/1/11.]
PDF246-272B-05300
Department final inspection.
(1) The department shall conduct a final inspection for all LOSS and witness a pressure test of the drainfield prior to cover except for LOSS with subsurface drip systems.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-05300, filed 5/25/11, effective 7/1/11.]
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(2) LOSS record drawings, in electronic format acceptable to the department, that are scaled to clearly show all necessary information.
[Statutory Authority: RCW 70.118B.020 and 70.118B.040. WSR 19-10-014, § 246-272B-05400, filed 4/22/19, effective 5/23/19. Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-05400, filed 5/25/11, effective 7/1/11.]
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(1) Design engineers shall use design criteria detailed in this chapter and from generally accepted guidance and standards when designing LOSS.
(3) LOSS must be designed to produce effluent prior to dispersal that is equal to or higher quality than STE.
(d) Drainage from surface runoff, footing drains, roof drains, subsurface stormwater infiltration systems, swimming pools, hot tubs, and other nonsewage drains; and
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06000, filed 5/25/11, effective 7/1/11.]
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(1) A vertical separation of at least three feet is required between the infiltrative surface of the drainfield bed or trench and:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06100, filed 5/25/11, effective 7/1/11.]
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(1) The design engineer shall use the following minimum design flows, which include the appropriate peaking factors, for developments or portions of developments serving residential facilities such as single-family residences, multi-family dwellings, and mobile home parks with total LOSS design flows of 14,500 gpd or less:
Design Unit1
Schools with showers and cafeteria2
Schools without showers and with cafeteria2
Schools without showers and without cafeteria
Temporary farm worker housing2
Truck stops and Interstate restaurants2
per person, per 8-hr shift
Elder care facilities, retirement homes2
Churches, without kitchen
Campgrounds, RV parks with flush toilets only, no laundry or wet sewer hookup
Campgrounds, RV parks with flush toilets, showers, laundry, no wet sewer hookup
Campgrounds, RV parks with flush toilets, showers, and wet sewer hookup, with or without laundry2
per RV space
Indicates potential for waste strength to exceed that of residential strength sewage, requiring Treatment Level E or higher.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06150, filed 5/25/11, effective 7/1/11.]
PDF246-272B-06200
Sewage characterization.
(1) The design engineer shall identify sewage characteristics in terms of the following:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06200, filed 5/25/11, effective 7/1/11.]
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Design requirements to allow monitoring and maintenance.
(1) The design engineer shall design LOSS to facilitate operation, monitoring and maintenance. The design of cleanouts and monitoring ports must be consistent with good engineering practice and the department's recommended standards and guidance for pressure distribution systems.
(i) Be a minimum of four inches in diameter;
(ii) Extend from the infiltrative surface of the drainfield to final grade;
(iii) Have a cap or cover to stop precipitation from entering them; and
(iv) Be anchored so they remain in place.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06400, filed 5/25/11, effective 7/1/11.]
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(1) The design engineer shall specify and the installer shall install only sewage tanks that comply with the requirements of chapter 246-272C WAC, On-site sewage system tanks, and this section.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06450, filed 5/25/11, effective 7/1/11.]
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Public domain and proprietary technologies.
(1) The department shall only approve treatment technologies and distribution technologies that comply with this section.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06550, filed 5/25/11, effective 7/1/11.]
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(1) Pressure distribution with timed dosing of LOSS effluent to the drainfield is required.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06600, filed 5/25/11, effective 7/1/11.]
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Sand-lined trenches and beds.
(1) Sand-lined trenches or beds may be used to meet Treatment Level B.
Table 8: Coarse Sand—Required Particle Size Distribution
Table 9: Fine Aggregate—ASTM C-33 Sand—Particle Size Distribution
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06700, filed 5/25/11, effective 7/1/11.]
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Intermittent sand filters.
(1) Intermittent sand filters may be used to meet Treatment Level B.
(14) Monitoring ports for intermittent sand filters must meet the requirements in WAC 246-272B-06400 (3)(b).
(15) Two monitoring ports must be installed every one thousand square feet in the sand filter and distributed uniformly throughout the filter area.
(a) One monitoring port must be installed to the top of the filter media; and
(b) One monitoring port must be installed to the bottom of the underdrain.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06750, filed 5/25/11, effective 7/1/11.]
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Recirculating gravel filters.
(1) A recirculating gravel filter may be used to meet Treatment Level C.
(14) Monitoring ports for recirculating gravel filters must meet the requirements in WAC 246-272B-06400 (3)(b).
(15) Two monitoring ports must be installed every one thousand square feet in the recirculating gravel filter and distributed uniformly throughout the filter area.
(a) One monitoring port must be installed to the top of the media interface; and
(16) The minimum volume of a recirculating mixing tank is:
(17) Underdrain and filtrate handling must be designed as required in WAC 246-272B-06750 (11), (12), and (13).
(18) The return flow from the recirculating gravel filter must be split to direct:
(a) A minimum of eighty percent of the effluent back to the recirculating or mixing tank; and
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06800, filed 5/25/11, effective 7/1/11.]
PDF246-272B-06850
Cesspools and seepage pits.
The department shall not approve a LOSS design that includes a cesspool, a drywell, or a seepage pit.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06850, filed 5/25/11, effective 7/1/11.]
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(1) An owner shall not install or use a holding tank sewage system for any new residential development or expansion of residential development, except as set forth in this section.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06900, filed 5/25/11, effective 7/1/11.]
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(1) A single owner development must be managed by a public entity, a wastewater company regulated by the Washington utilities and transportation commission, or a private management entity.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07000, filed 5/25/11, effective 7/1/11.]
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(1) The owner shall operate and maintain the LOSS according to:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07050, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07100
(1) The department may enter and inspect any LOSS site or LOSS facility to determine compliance with chapter 70.118B RCW, Large on-site sewage disposal systems or this chapter:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07100, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07150
(1) All LOSS must provide adequate treatment in quantity and quality to sewage in a reliable manner at all times.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07150, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07200
Operator qualifications and responsibilities.
(1) Owners of LOSS using mechanical treatment or lagoons with design flow greater than 14,500 gpd shall employ one or more operators certified according to chapter 173-230 WAC, Certification of operators of wastewater treatment plants.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07200, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07250
(1) The LOSS owner shall install and maintain one or more flow monitoring devices to measure flow.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07250, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07300
Sewage tank management.
(1) The owner, management entity, or operator shall create and follow a routine schedule as required in WAC 246-272B-04200(5) for:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07300, filed 5/25/11, effective 7/1/11.]
PDF246-272B-07400
(1) When an owner modifies a LOSS, the component or components being modified must meet the requirements of this chapter.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07400, filed 5/25/11, effective 7/1/11.]
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The LOSS owner who is permanently abandoning any portion of a LOSS, including a septic tank, seepage pit, cesspool, or other sewage container, and all accessible parts of the drainfield that may become a hazard, including distribution boxes and pump chambers, shall provide:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07500, filed 5/25/11, effective 7/1/11.]
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Connection to a sanitary sewer system.
(1) The department may require the LOSS owner to connect some or all residences, structures, lots and units to a sanitary sewer system consistent with WAC 246-272B-07450 (4)(b).
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-07550, filed 5/25/11, effective 7/1/11.]
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(1) The LOSS project applicant or LOSS owner may request a waiver from specific requirements of this chapter. The request must:
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-08000, filed 5/25/11, effective 7/1/11.]
PDF246-272B-08100
(1) The department shall enforce this chapter and chapter 70.118B RCW, Large on-site sewage disposal systems.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-08100, filed 5/25/11, effective 7/1/11.]
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Third-party appeals to department permit decisions for LOSS over 14,500 gpd and adjudicative proceedings.
(1) A person aggrieved by the issuance of an initial permit, or by the issuance of a subsequent permit to increase the volume of waste disposal or to change effluent characteristics, for systems with design flows of more than 14,500 gpd, has the right to an adjudicative proceeding.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-08300, filed 5/25/11, effective 7/1/11.]
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If any provision of this chapter or its application to any person or circumstances is held invalid, the remainder of this chapter, or the application of the provision to other persons or circumstances is not affected.
[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-09000, filed 5/25/11, effective 7/1/11.]