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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Air 8. Construction activities could cause temporary increases in dust and emissions pollution. Post - construction emissions will be entirely related to vehicular and bus trips. The only new trips to the site are those associated with the Birth -to- Kindergarten Center. Water 9. There is no surface water body on or in the immediate vicinity of the property and it is not located within a floodplain. There will be no discharges to surface waters. 10. Stormwater management systems are designed in accordance with the 2016 King County Surface Water Design Manual. The source of stormwater runoff for Foster High School and Showalter Middle School will be from roofs, athletic fields /tennis courts /playgrounds, sidewalks and asphalt drive aisles /parking area. All stormwater will be managed onsite through collection, treatment and discharge to the City stormwater system. Some limited infiltration will occur. 11. For the Birth -to- Kindergarten site, the source of water runoff will be primarily just from the surface area of the proposed project. The surface runoff will be collected in a system of catch basins, and conveyed with pipes to an underground detention vault prior to being discharged through an existing surface mounted pipe on the east side of the site. Plants 12. Some trees will be removed along the Foster High School north boundary to grade the area for the tennis courts and ballfieds. Also trees will be removed for the planned improvements to S. 142nd Street and the eastern portion of the Birth to Kindergarten site. Trees to remain that are adjacent to the construction areas will be protected with a chain link fence surrounding the drip line. 13. No landscaping is proposed at the Showalter Middle School site. New landscaping at the Foster High School and Birth -to- Kindergarten sites will include native plants and /or drought resistant ornamentals. Landscaping will be provided within the new parking lot areas and portions of property perimeters. Animals 14. According to the Wash Dept. of Fish and Wildlife mapping services, there are no threatened or endangered animal species on or in the vicinity of the project site. Energy and Natural Resources 15. Energy conservation features include an energy management system (EMS) for monitoring energy use for lighting, HVAC and hot water. LED lighting with motion sensors will be used in classrooms and parking lots. The projects will meet requirements for Superior Energy Performance — Energy Star. The Birth -to- Kindergarten Center will be designed to maximize the use of natural daylight — thus reducing the electrical lighting needs. The Birth -to- Kindergarten Center is intended to be designed equivalent to LEED Silver. Environmental Health 16. No contaminated soils were found during testing. Hazardous Building Materials Survey (Hazmat) Reports were prepared. For Foster High School it concluded that there were no known contaminants or health hazards on the site. The technology building study founds some asbestos - containing materials and lead -based paint that is below EPA levels. Noise 17. On a short-term basis, some noise may be created by construction activity due to operation of equipment. Noise levels will not exceed the maximum permissible sound levels allowed per Tukwila Municipal Code (TMC) Chapter 8.22. 18. Long term noise will be typical of that associated with an elementary school, including vehicular and school bus noise, which is most prevalent at school start and stop times. Truck deliveries will be minimal. The noise of children at play in the outdoor areas will occur during various times throughout the school day. Noise associated with the fire alarm will occur from time to time. 105