Planning 2017-06-22 Item 4 - Foster High School Expansion and Birth to Kindergarten - Attachment D: SEPA Mitigated Determination of Nonsignificance by Tukwila School District (5/9/2017)

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Plants 11. Clearing limits will be marked with protective fencing prior to clearing and grading activities. 12. A 6 -foot high temporary chain link fence must be placed outside the dripline of the trees to be retained prior to the commencement of demolition and earthwork. 13. An Arborist Report will be provided early May 2017 detailing the health of the trees located along the perimeter of the Birth to Kindergarten Center. Any unhealthy or unsafe trees will be removed based upon a recommendation by the arborist and approval from the City. Environmental Health 14. The hazardous building materials in the technology building will need to be abated prior to demolition and must follow City and State regulations. 15. If destructive demolition identifies hidden or previously unknown asbestos, the Department of Occupational Safety and Health (DOSH) requires that the asbestos - containing material be removed by trained and licensed contractors using certified asbestos abatement workers and supervisors. A 10 -day notification is also required before abatement can begin. Noise 16. Noise impacts associated with the construction of the project will be limited in duration, consistent with City of Tukwila Chapter 8.22 of the Tukwila Municipal Code (Noise). Construction hours will be limited to 7 AM -8 PM Monday through Friday and 8 AM — 6 PM Saturday, Sunday and State - recognized holidays. Temporary noise impacts outside of the daytime hours will require approval of a variance, per TMC 8.22.120. 17. To mitigate noise impacts during the construction phases, measures such as locating stationary equipment away from receiving properties, erecting portable noise barriers around loud stationary equipment, turning off idling construction equipment, requiring contractors to maintain all equipment, and training construction crews to avoid unnecessarily loud actions near noise - sensitive areas shall be employed. 18. Once the school is under operation, school buses shall be turned off during the load /unload periods to limit idling. 19. Outdoor sporting activities will conclude by 10:00 p.m. Aesthetics 20. A zoning variance shall be secured to allow additions to Foster High School to exceed the zoning code maximum of 30 feet by 2 feet, and to allow the relocation of the flagpole in the stadium to a maximum of 50 feet. 21. The project will require a Conditional Use Permit and Design Review approval by the City Board of Architectural Review. That process will evaluate the architectural details and compliance with City design standards. Light and Glare 22. Use full cut -off light fixtures and aim fixtures to direct light downward to minimize light trespass. Historic and Cultural Preservation 23. If cultural or archeological objects are found during site preparation work, the City and Washington State Department of Archaeology and Historic Preservation will be notified, and appropriate measures will be taken. I