On July 18, 2018, the WA State Department of Ecology repealed existing Chapter 173-360 WAC and adopted new Chapter 173-360A WAC, Underground Storage Tank (UST) Regulations. The new chapter modifies and replaces the repealed chapter. The rule was modified to:
• Incorporate federal rule changes needed to maintain state program approval, as specified in 40 C.F.R. Parts 280 and 281 (such as new operation and maintenance requirements for UST systems and requirements for field-constructed tanks and airport hydrant systems).
• Integrate changes to the state statute that authorizes the program, Chapter 90.76 RCW (such as licensing requirements for UST systems).
• Update other requirements governing the program (such as UST service provider requirements).
• Streamline rule requirements, improve rule clarity, and improve consistency within the rule and with other state and federal laws and rules (such as reorganizing the rule).