902 PINE ST NORTH SOUND BEHAVIORAL HEALTH TREATMENT CENTER 2025-11-04

I 1.0 Project Overview 1.1 General Description of Project The project site is located on the existing Denny Juvenile Justice Center site (902 Pine Street, Everett, WA 98201) and is encompassed by one tax parcel (29051700102000). The parcel is approximately 9.25 acres in total size and the area affected by redevelopment is approximately 0.70 acre. The project parcel is bounded by Pine Street to the east, 10th Street to the south, Everett Community College to the west, and single-family residential developments to the north. Refer to Appendix A-1 for a Site Vicinity Map. The project proposes to construct a new building addition to the existing Denny Juvenile Justice Center, renovate the existing juvenile housing facility, and construct new drop-off, parking area, service loading, and pedestrian walks. Stormwater will be collected and routed to the bioretention cell and ultimately discharged to the existing combined sewer system. The existing Denny Juvenile Justice Center will be maintained during construction. Stormwater management will comply with the City of Everett 2010 Stormwater Management Manual(City Manual), along with Interim Policy 2-11 and City of Everett Standard Plans. This report has been prepared to document how the project meets Minimum Requirements 1 through 9, as outlined in the City Manual. 1.2 Existing Conditions The project site currently has existing buildings, parking area, drop-off area, and sidewalks. Vehicular access is from 10th Street and Pine Street. The site has roughly 12 feet of fall across the developed portion of the site, with the highest point along the northeastern boundary at roughly 105 feet, and the lowest point along the southwestern boundary at roughly 93 feet. The site slopes generally from the northeast to the southwest. The project site drainage is considered a single Threshold Discharge Area (TDA). In the existing conditions, runoff generated within the project site is collected by catch basins and discharged to a combined storm/sewer system. Refer to Appendix A-2 for an Existing Conditions Map. According to the USDA(Appendix A-8, USDA Soil Map), the site soils consist of Alderwood- Urban land complex, 2 to 8 percent slopes, Bellingham silty clay loam and urban land. A geotechnical report was prepared by GeoTest Services, Inc. on November 16, 2018, giving additional soil information (see Appendix B-2). 1.3 Developed Conditions The project proposes to renovate the existing Denny Juvenile Justice Center and construct a new building addition on the east side. The project will demolish part of the existing parking, vegetated area, sidewalks, and access road. Improvements include construction of a new building addition, utilities, service loading access drive, pedestrian walks, and parking area with ADA stalls. In addition, some of the existing paved surface will be converted to grass area, which will increase site vegetation. The project site area is 0.72 acre, with 0.46 acre of new and replaced impervious area, which is delineated on Appendix A-3, Developed Conditions Map. A bioretention cell will be constructed to provide onsite stormwater management. Runoff generated by the new roof, parking area, sidewalk, service loading access drive, and non-target impervious area will be routed to the bioretention cell for flow control. Existing trees within the project site will be preserved. Some of the exiting pavement will be converted to vegetated area. In addition to the bioretention cell, stormwater improvements will also include trench drains,storm pipes, and catch basins. Stormwater Site Plan Report North Sound Behavioral Health Treatment ID0 a AHBL No.2170857.10