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0 Permit Inspections <br /> V E R E T T City of Everett <br /> WASHINGTON <br /> Permit Number: PW2103-004 Description: BOEING STORMWATER PONDS UPGRADE <br /> Applied: 3/2/2021 Approved:4/22/2021 Site Address: 3003 W CASINO RD <br /> Issued:4/22/2021 Finaled: City,State Zip Code: EVERETT,WA <br /> Status:ARCHIVED-NOT FINALED Applicant: BOEING COMPANY <br /> Parent Permit: Owner: BOEING COMPANY <br /> Parent Project:SEPA20-027 Contractor: IMCO GENERAL CONSTRUCTION LLC <br /> Details: <br /> Site stormwater improvements that requires work to be done in and around the stormwater ponds,as well as,an entire excavation <br /> and upgrade to the existing peat sand filter.This includes the installation of new storm drains,underground vaults,pumps,and a full <br /> replacement of water quality treatment media and the associated distribution system. <br /> (4/20/20219:19 AM CAC) <br /> Powder Mill Gulch Basin: North and South Complex Area peak outflow from detention= 49 cfs. Based on 1998 Comprehensive Storm <br /> Drainage Plan inflow hydrographs(SWMM,Version 3)and detention basin expansion (HEC-1_routing analysis).The stormwater <br /> control facilities are designed to limit offsite discharge to less than 49 cfs for up to a 25-yr,24-hr City of Everett design storm (2.6 inch <br /> precipitation total).The max.release rate value was required by COE based on a previous 10-yr predevelopment rational method flow <br /> estimate. <br /> BOEING STORMWATER PONDS UPGRADE <br /> SCHEDULED DATE COMPLETED DATE TYPE INSPECTOR RESULT REMARKS <br /> Notes: <br /> I_ <br /> Printed:Thursday, 28 December, 2023 1 of 1 F� <br /> SUPERION <br />