Laserfiche WebLink
The private system continues for approximately 450 feet before eventually discharging to the <br />City of Everett combined sewer system that continues to the southeast. <br />Site Soils <br />Based on the 2021 geotechnical report completed by MP Engineering (see Appendix A), the <br />underlying soils in the area consist of fill material over a layer of Vashon Till material. The <br />upper four feet of fill material consists of gravelly silty sand and crushed concrete debris from <br />the building demolition project. The fill material and Vashon Till and layers contain a high <br />percentage of fines and are highly moisture sensitive. <br />Proposed Conditions <br />This project will construct a new concrete pedestrian plaza and adjacent pedestrian walkway to <br />access the plaza. The walkway will connect with the existing walkways within and along the <br />perimeter of the site and be ADA compliant. Water service in the form of a hose bib will be <br />provided to the plaza. <br />Proposed Stormwater Facilities <br />Stormwater runoff from the plaza and adjacent sidewalk areas will drain as sheet flow through <br />the adjacent lawn or into a gravel trench drain to attenuate the flows. The outlet pipe from the <br />gravel trench is equipped with an orifice plate to control the discharge flow to the downstream <br />conveyance system. The gravel trench drain system has been sized to match the 25-year and <br />100-year peak storm events of the existing lawn conditions. <br />Stormwater will eventually discharge to the combined sewer system downstream. <br />Stormwater Site Plan 3ti ,® <br />Index Lawn Project <br />