WASHINGTON STATE DEPARTMENT OF ECOLOGY NOTICE OF PUBLIC COMMENT PERIOD December 4, 2025 – January 6, 2026 Arkema Inc Cleanup Site 2901 Taylor Way, Tacoma WA Cleanup Site ID #3405, Facility Site ID #1220 Draft Agreed Order Amendment, Draft Interim Action Plan, and State Environmental Policy Act Determination of Non-significance are available for public comment. Submit comments online: https://go.ecology.wa.gov/comment3405 Review documents online: https://go.ecology.wa.gov/3405 Review documents in-person: Tacoma Public Library - Main Branch at 1102 Tacoma Avenue South, Tacoma WA 98402. Phone: 253-280-2800 Make an appointment to review documents at Ecology's headquarters at 300 Desmond Dr SE, Lacey. Call 360-407-6365 or email PublicDisclosureSWRO@ecy.wa.gov to make an appointment. Site Background: The Arkema Inc site was formerly a chemical manufacturing plant, in the past called Atofina Chemicals, Elf Atochem, and Pennwalt. The products that were manufactured at the site included chlorine, sodium hydroxide (caustic), sodium chlorate, hydrochloric acid, and sodium arsenite (Penite). Today, the site is vacant. It is currently covered with vegetation, crushed rock, and some former building/tank foundations. The Port plans to redevelop the site for continued industrial and marine-related uses. Proposed interim cleanup efforts will address the movement of contaminated groundwater from the site into the Hylebos Waterway. Questions? Contact Abby Zabrodsky, public involvement coordinator, by email at Abby.Zabrodsky@ecy.wa.gov or phone at 564-250-0561. IPL0294900 Dec 4 2025