The project requires installation of new onsite sanitary and storm sewer systems for a new single-family home with accessory dwelling units. The sanitary sewer will connect to an existing shared side sewer, with PE certification required. Stormwater management includes non-infiltrating bioretention planters and permeable pavement, with discharge to a new curb weep on North 48th Street. No footing drains are included. A separate SDOT right-of-way permit is necessary before starting work in the public area.
This project involves the installation of a new onsite sanitary sewer system to serve a new single-family residence (SFR), an accessory accessory dwelling unit (AADU), and a detached accessory dwelling unit (DADU). The new sanitary sewer will connect to the existing shared side sewer, which ties into the main sanitary sewer line. A Professional Engineer (PE) evaluation and certification are required for the sanitary sewer design and installation. Additionally, a new storm sewer system will be installed, discharging to a new curb weep located on North 48th Street. No footing drains are proposed for this project. Onsite stormwater management facilities must be implemented, including non-infiltrating bioretention planters and permeable pavement surfaces as best management practices (BMPs) to control stormwater runoff. A separate right-of-way (ROW) permit must be obtained from the Seattle Department of Transportation (SDOT) prior to commencing any work within the public ROW.
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