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1 <br /> 2. EXISTING CONDITIONS <br /> The total site area is 0.59 acres and consists of asphalt surface parking and a small amount of <br /> landscaping. The site slopes from west to east. The existing parking lots are access from the <br /> alley which at an elevation of approximately 67' is more or less 15' lower than the Broadway <br /> frontage. A steep cut retained by rockeries, brick walls, and ecology blocks separates the upper <br /> Broadway frontage from the parking lots. <br /> North of the site is the YWCA which sits above the subject parking lot by approximately 4'. The <br /> grade difference is made up with stacked ecology blocks. This existing building will be <br /> protected during construction with an engineered system developed by the contractor and <br /> structural engineer. The YWCA building has access from both the alley and Broadway. <br /> South of the proposed building is the existing Hopeworks Station building. This building has <br /> access from Broadway and the alley. A portion of the parking lot serving Hopeworks Station <br /> will be redeveloped with a proposed parking structure. <br /> • Surface runoff from the existing parking lot is collected in catch basins and drains in pipes to a <br /> 12" sewer main in the alley and also an 8" lateral that crosses through the neighboring <br /> Brosmonroe property east of the alley. No easement was discovered for the 8" lateral that <br /> currently drains a portion of the alley and the existing parking lots. There is no water quality or <br /> flow control currently implemented. <br /> The City of Everett has stated that no new storm connection will be allowed to the existing 12" <br /> main and connection to the 8" lateral would require an easement from the neighboring property. <br /> 1 Thus the stormwater design will install a new main in the alley. <br /> A Geotechnical Engineering report was commissioned in the summer of 2017 to, amongst other <br /> things, investigate the underlying soil conditions. Soil conditions observed ranged from loose <br /> fill to dense silty sand. In general the loose fill was observed along the western edge of the site <br /> (above the retaining/rock walls)the more dense silty sand was observed beneath the existing <br /> parking lots. Due to the high presence of fines in the existing soils, the Geotechnical Engineer <br /> does not recommend infiltration of collected stonnwater for this site. A copy of the <br /> Geotechnical Report is included as an appendix to this Stormwater Management Design Report. <br /> I <br /> 1 <br /> I <br /> Hopeworks II DCI Engineers Page 2 <br /> Storm Drainage Report <br />