# WAC 222-10-030: WAC 222-10-030. *SEPA policies for potentially unstable slopes and landforms > Washington · Regulations · In force URL: https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_030 ## Section - **Citation:** WAC 222-10-030 - **Heading:** WAC 222-10-030. *SEPA policies for potentially unstable slopes and landforms - **Jurisdiction:** Washington - **Kind:** Regulations - **Status:** In force - **Text as of:** August 14, 2026 - **Source:** Compiled text - **Location:** Washington Administrative Code / Title 222 / Chapter 222-10 / Section 222-10-030 ## Text In addition to SEPA policies established elsewhere in this chapter, the following policies apply to forest practices described in WAC 222-16-050 (1)(d) relating to construction or harvest on potentially unstable slopes or landforms. (1) In order to determine whether such forest practices are likely to have a probable significant adverse impact, and therefore require an environmental impact statement, the applicant must submit the following additional information, prepared by a qualified expert as defined in subsection (5) of this section. The qualified expert must describe the potentially unstable landforms in and around the application site and analyze: (a) The likelihood that the proposed forest practices will cause movement on the potentially unstable slopes or landforms, or contribute to further movement of a potentially unstable slope or landform; (b) The likelihood of delivery of sediment or debris to any public resources, or in a manner that would threaten public safety; and (c) Any possible mitigation for the identified hazards and risks. (2) The department's threshold determination will include an evaluation of whether the proposed forest practices: (a) Are likely to increase the probability of a mass movement on or near the site; (b) Would deliver sediment or debris to a public resource or would deliver sediment or debris in a manner that would threaten public safety; and (c) Such movement and delivery are likely to cause significant adverse impacts. If the department determines that (a), (b) and (c) of this subsection are likely to occur, then the forest practice is likely to have a probable significant adverse impact. (3) The department will evaluate the proposal, using appropriate expertise and in consultation with other affected agencies and Indian tribes. and (c) Such movement and delivery are likely to cause significant adverse impacts. If the department determines that (a), (b) and (c) of this subsection are likely to occur, then the forest practice is likely to have a probable significant adverse impact. (3) The department will evaluate the proposal, using appropriate expertise and in consultation with other affected agencies and Indian tribes. (4) Specific mitigation measures or conditions must be designed to avoid accelerating rates and magnitudes of mass wasting that could deliver sediment or debris to a public resource or could deliver sediment or debris in a manner that would threaten public safety. (5) Qualified expert for the purposes of this section, reanalysis of watershed analysis mass wasting prescriptions under WAC 222-22-030 , and preparation of required geologic information under WAC 222-20-010 (9), means a person licensed under chapter 18.220 RCW as either an engineering geologist or as a hydrogeologist (if the site warrants hydrologist expertise), with at least three years of field experience in the evaluation of relevant problems in forested lands. ## Nearby sections - [WAC 222-10-010 WAC 222-10-010. Policies and authorities](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_010.md) - [WAC 222-10-030 WAC 222-10-030. *SEPA policies for potentially unstable slopes and landforms](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_030.md) - [WAC 222-10-035 WAC 222-10-035. *Watershed analysis SEPA policies](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_035.md) - [WAC 222-10-040 WAC 222-10-040. Class IV-Special threatened and endangered species SEPA policies](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_040.md) - [WAC 222-10-041 WAC 222-10-041. Northern spotted owls](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_041.md) - [WAC 222-10-042 WAC 222-10-042. Marbled murrelets](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_042.md) - [WAC 222-10-050 WAC 222-10-050. Adoption by reference](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_050.md) - [WAC 222-10-070 WAC 222-10-070. Additional definitions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_070.md) - [WAC 222-10-090 WAC 222-10-090. Designation of responsible official](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_090.md) - [WAC 222-10-110 WAC 222-10-110. Board's SEPA public information center](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_110.md) - [WAC 222-10-120 WAC 222-10-120. Exemption for emergency actions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_120.md) - [WAC 222-10-125 WAC 222-10-125. Exemption from RCW 43.21C.030 (2)(c)](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_125.md) - [WAC 222-10-130 WAC 222-10-130. Lead agency, agency with jurisdiction, consulted agency](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_130.md) --- Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_222_10_030. Check the current official text before relying on it. Not legal advice.