The bill focuses on improving the management of agricultural and forestry biomass through the implementation of portable flame cap kilns, which are recognized as environmentally sustainable. It introduces a new section that highlights the role of these kilns in reducing greenhouse gas emissions, enhancing biogenic carbon storage, and mitigating air quality issues associated with open burning. The legislation amends several sections of the Revised Code of Washington (RCW) to define and regulate the use of flame cap kilns, including specific design and operational requirements. Key amendments include the definition of "flame cap kiln" and provisions allowing the combustion of natural vegetation from agricultural activities, provided that prohibited materials are not included.

Additionally, the bill revises existing regulations on burning permits, ensuring compliance with air quality standards set by the Department of Ecology. It establishes that burning activities must not exceed state air quality standards in critical areas and mandates the Department of Ecology to monitor air contaminant levels. The legislation also encourages the Department of Natural Resources to promote alternative logging and silviculture practices to reduce burning needs, outlines a hierarchy for disposal methods, and empowers the Department of Natural Resources to revoke permits in areas with impaired air quality. Overall, the bill aims to balance agricultural practices with environmental protection by promoting innovative and regulated burning techniques.

Statutes affected:
Original Bill: 70A.15.1030, 70A.15.5090, 70A.15.5120, 70A.15.5140
Substitute Bill: 70A.15.1030, 70A.15.5090, 70A.15.5120, 70A.15.5140
Bill as Passed Legislature: 70A.15.1030, 70A.15.5090, 70A.15.5120, 70A.15.5140
Session Law: 70A.15.1030, 70A.15.5090, 70A.15.5120, 70A.15.5140