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Ecology is pleased to announce the release of updated guidance for the “Sewers” (C1) and “General Requirements” (G1) chapters of the Criteria for Sewage Works Design Manual (Orange Book). In addition, we have added a brand-new chapter called “Lagoon and Liner Design Guidelines” (T7).
Ecology made these updates to stay current with newly developed technologies and to accurately reflect the current regulatory environment surrounding the construction of a domestic wastewater collection and treatment facility. These updates also reflect the feedback we received from community and state agency partners who commented on draft versions of the chapters.
The Highlights
The changes for each chapter are summarized below. We encourage anyone involved with sewage works design to review these chapters to see how the new guidance may impact your specific project.
Chapter C1 - Sewers
This chapter covers the design, construction, operation, and maintenance of gravity and low-pressure sewers and manholes. Updates to this chapter include:
- Updated information on Pump-out Facilities at marinas per Washington’s “Vessel Sewage No Discharge Zones” regulation (NDZ), Chapter 173-228 WAC.
Chapter G1 - General Requirements
This chapter summarizes regulatory requirements from Ecology, other state agencies, and EPA. The updates to this chapter include:
- Updated information on regulatory requirements applicable to wastewater treatment facilities design, such as changes to DOH responsibilities in regulating On-Site Sewage Systems per updated Chapter 246-272A WAC and RCW 70.118B.
Chapter T7 - Lagoon and Liner Design Guidelines
This new chapter has been published as a stand-alone file that we will eventually incorporate into the Orange Book’s “Treatment” category. The chapter includes guidance on:
- Types of liners and their Installation.
- Requirements for pre-liner site preparation.
- Requirements on liner installation QA/QC requirements.
- Liner limitations and potential for damage by equipment.
- Liner leak and leak detection plan.
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Where Can I Find the New Guidance?
You can find the updated version of the Orange Book, along with the new Lagoon and Liner Design Guidelines chapter (T7), on our website.
What if I Want a Printed Copy?
The PDF version of the Orange Book, available on our website, allows readers to easily print individual sections as needed. However, Ecology does not provide physical copies of the Orange Book. The Orange Book is a large, dynamic document that we update on a regular basis, and printing physical copies results in environmental and financial impacts.
Questions? Contact:
Foroozan Labib
Chair, Orange Book Workgroup
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