Mitigated determination of non-significance · example
Cascade Middle School Replacement
Auburn School District will build a new middle school of about 118,000 square feet for 800 students, with room for 10 portables, athletic fields, a roundabout and street extensions, and will clean up pesticide-contaminated shallow soil during construction.1
Facts from Auburn School District No. 408 public records, each linked by number to its source; checked November 13, 2026. Section notes by ePlan.
At a glance
- Where
- 1020 40th Street NE, Auburn, King County, Washington 98002; six King County parcels north of which is the Monterey Park neighborhood1
- Size
- Approximately 118,000 square feet building for 800 students; 10 future portables for 250 more students (1,050 total)3
- Lead agency
- Auburn School District No. 408 (lead agency for SEPA); the City of Auburn has land use permit authority2
- Review
- Mitigated determination of non-significance, with no EIS required3
- Legal citation
- RCW 43.21C.030(2)(c); issued under WAC 197-11-350(2)3
- Status
- MDNS issued November 3, 2026; comments due November 17, 20263
Timeline
Documents Auburn School District No. 408 published
What the documents say
MDNS
- Description of Proposal
- Describes a 118,000 square foot school for 800 students, 10 portables, two athletic fields, a roundabout at I Street NE and 40th Street NE, and street extensions.3
- Proponent and Location of Proposal
- Names Auburn School District No. 408 as proponent and gives the 40th Street NE address and six King County tax parcel numbers.3
- Lead Agency and Threshold Determination
- The district finds no probable significant adverse impact, requires no EIS, and assumes compliance with state law and City of Auburn ordinances on access, drainage and utilities.3
- Water
- Single condition requires wetland mitigation from the Critical Areas Report and Buffer Enhancement Plan, with City approval needed for buffer reduction beyond averaging, plus enhancement and monitoring.3
- Comment Period and Appeal
- Lead agency will not act for 14 days; comments go to the Responsible Official by November 17, 2026, and no administrative appeal exists.3
SEPA Checklist (without appendices)
- Title and Project Team
- Checklist for Cascade Middle School Replacement and Site Remediation, dated October 2026, listing the applicant and Shockey Planning Group as environmental consultant.2
- Table of Contents
- Covers background plus 16 environmental elements from earth to utilities, with figures for the site plan, vicinity, planting and field lighting, and a trip generation table.2
- Appendices
- Lists five appendices: legal description, geotechnical data report, stormwater site plan, SEPA sound analysis and traffic impact analysis report.2
- A. Background
- Names the applicant, consultant, architect and civil engineer, and states the City of Auburn holds land use permit authority while the district is SEPA lead agency.2
- Proposed timing or schedule
- Construction is expected to start in spring 2027 and finish July 2028, contingent on funding from a successful bond proposition.2
Start one like it.
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More examples
- Pringle Heights II Plat, City of KennewickDetermination of non-significance · Construction expected to begin May 2027
- Black Lake Dock Replacement, City of IlwacoDetermination of Non-Significance · Comments due December 2, 2026
- Lower Swamp Creek Bridge Replacement, City of KenmoreSEPA determination of nonsignificance · Last day to appeal November 18, 2026
- Vision House Phase IV, City of RentonDetermination of non-significance · Appeal deadline November 16, 2026
SEPA Environmental Checklist · All State and local projects
Sources
- Washington SEPA Register, record 202604679apps.ecology.wa.gov
- SEPA Checklist (without appendices)apps.ecology.wa.gov
- MDNSapps.ecology.wa.gov