Washington Administrative Code
Title 246 - Health, Department of
SEWER SYSTEMS
Chapter 246-272B - Large on-site sewage system regulations
Part 6 - DESIGN AND TECHNICAL STANDARDS
Subpart A - General Requirements
Section 246-272B-06400 - Design requirements to allow monitoring and maintenance
Universal Citation: WA Admin Code 246-272B-06400
Current through Register Vol. 24-18, September 15, 2024
(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.
(2) All accesses to LOSS components must be designed to:
(a) Allow for monitoring and
maintenance activities;
(b) Prevent
unauthorized access; and
(c)
Minimize confined space entry. Confined space entry is regulated by department
of labor and industries under chapter 296-809 WAC, Confined spaces.
(3) The design engineer shall design and verify that the LOSS meets the following minimum requirements:
(a) Service access ports must be installed at
finished grade for all LOSS components;
(b) Monitoring ports must:
(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.
(c) Mechanical
and electric distributing valves, if used, must be accessible to allow
verification that they are working properly;
(d) Controls and warning devices must be
clearly accessible and visible including, but not limited to:
(i) Process controls, such as measuring
devices, float and pressure activated pump on-off switches, pump-run timers,
and process flow controls;
(ii)
Diagnostic tools, such as dose cycle counters and flow meters on either the
water supply or sewage stream or hour meters on the sewage stream;
and
(iii) Alarms.
(e) Audible and visual alarms must
be placed on a circuit independent of the pump circuit.
Statutory Authority: RCW 70.118B.020. 11-12-035, § 246-272B-06400, filed 5/25/11, effective 7/1/11.
Disclaimer: These regulations may not be the most recent version. Washington may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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