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EXECUTIVE SUMMARY <br /> Introduction <br /> This project involves the construction of a new neighborhood park in the City of <br /> Everett. This park will be constructed on a currently undeveloped property, and will <br /> include playground equipment with rubberized surfacing, concrete walking paths <br /> and gathering spaces, and lawn/landscaping. The parcel is located at 4817 Rucker <br /> Avenue, immediately south of the new YMCA facility. <br /> Existing Conditions <br /> The project site is currently covered in lawn and lies between Rucker Ave. and Colby <br /> Ave, with sidewalks along both of these frontage streets. Site topography creates a <br /> slight high point in the center of the parcel, splitting the site into two on-site drainage <br /> basins (see attached on-site basin map). The westerly basin sheet flows runoff to the <br /> west and into Rucker Ave. The easterly basin sheet flows runoff to the east and into <br /> Colby Ave. Site slopes range from nearly flat to approximately 3%. <br /> Site soils are mapped as "Indianola" loamy sand, Hydrologic Group A, and <br /> "Alderwood-Urban Complex", Hydrologic Group C, by the National Resource <br /> Conservation Service. On-site soil conditions were explored by Associated Earth <br /> Sciences, Inc. (AESI), as part of the YMCA development, and results are included in <br /> the "Subsurface Exploration, Geologic Hazard, and Geotechnical Engineering <br /> Report", dated February 26, 2018, and the "Stormwater Infiltration Assessment", <br /> dated January 17, 2018, both completed by AESI for the YMCA development. <br /> Proposed Condition <br /> Proposed site development will create approximately 10,851 square feet of new pedestrian <br /> pathway (hard surface) and 9917 square feet of rubberized tile surfacing (permeable). As <br /> this is a pedestrian-only park, all hard surfaces, except the rubberized surfacing, are non- <br /> pollution generating hard surfaces (NPGHS). The project will also replace existing <br /> grassllawn areas with grass or landscaping, yielding no change in pervious surfaces with <br /> respect to hydrologic modeling. Total site disturbance is assumed to be the entire site (1.5 <br /> acres). <br /> Due to the permeable on-site soils, stormwater management for the proposal will be <br /> handled through infiltration of most of the proposed surface. A wide rock-filled infiltration <br /> trench will be utilized in the northwest corner of the site, and will collect and fully infiltrate <br /> runoff from approximately 90% of the site. The remaining portion of the site will sheet flow <br /> f <br />