7505 SEAWAY BLVD SEPA 016 - 034 - SEAWAY TRANSIT CENTER Land Use Decision Documents 2025-04-22

4-2.3(1) PIPE MATERIALS 1. Pipe material,joints, and protective treatment shall conform to the requirements set forth in Section 9-05 of the WSDOT/APWA Standard Specifications. The following pipe materials are allowed for use in pipe systems in the City of Everett; other pipe materials may be approved on a case-by-case basis: a)Plain concrete pipe(12 inches in diameter, used only for driveway culvert) b)Reinforced concrete pipe c) Ductile iron pipe d) Galvanized or aluminized corrugated iron or steel pipe, treatment 1 through 6 (not to be used in city maintained systems unless approved in advance by the City Engineer) e) PVC pipe(SDR35,ASTM D3034 with 3 feet of cover, minimum) f) Corrugated high density polyethylene pipe, with smooth interior 2. Coupling bands shall be of the same material as the pipe. 3. Materials for concrete, rubber gaskets, metal castings, reinforcing steel, and masonry units shall meet the requirements of the appropriate sections of the WSDOT/APWA Standard Specifications. From: Brian Doolan Sent: Monday, July 25, 2016 7:43 AM To: Jane Zimmerman Subject: RE: Seaway Transit Ok thanks for the update. I would like to see plans before I give any input. But you are correct in that I would not like a CMP detention pipe and would rather a PVC/Sanitite version.Thanks From: Jane Zimmerman Sent: Monday, July 25, 2016 7:39 AM To: Brian Doolan Subject: RE: Seaway Transit Hi Brian— There will be more than 5,000 square feet of additional impervious area created in the right-of-way as part of this project. The pavement on both Seaway Blvd and 75th St SW has to be expanded to accommodate bus stops on Seaway Blvd and busses turning into the transit center from 75th. No runoff from the CT parcel will enter the treatment and detention system for the "public" runoff from the right-of-way improvements,only right-of-way runoff. My first suggestion was that they bring the right-of-way runoff into their private, on-site facilities to treat and detain it, and sign an agreement to hold the City harmless for any spills, etc., in the ROW that might impact their system, but their . doing so isn't feasible from either a technical standpoint (the low spot in the ROW is too low to get the public runoff into the site)or a political standpoint(CT simply won't sign such an agreement). Therefore, they are planning separate stormwater treatment and detention systems,one system for the on-site runoff, and one system for the public runoff. There are no plans to review at this time; Perteet is CT's design firm for the project and they still haven't submitted a SEPA application for the project. Technically, all we've had at this point is a pre-application meeting for the project, nothing more. Thanks, Jane 3