8130 EVERGREEN WAY BASE FILE 2018-01-01 MF Import

r i Projecc overview . Location: The project is located West of Evergreen Way and East of and adjacent to Beverly Lane at the intersections with SR 526, in Everett, Washington. • Project Address: 8130 Evergreen Way, Everett WA 98201. • Project Purpose: Provide additional parking spa�;e for retail business. • Temporary Erosion Control will include cover practices that minimize the time and area bare earth surfaces are exposed to runoff; and other Best Management Practices (BMP's) to reduce the generation pollutants and to contain or control generated pollutants. • The stormwater management system wil convey runoff from the proposed parkir�g quality system will be designed to meet Everett (ESMM). Existi.ng Conditions Summary I include catch basins and pipes to collect and area. The conveyence and detention and water the Stormwater Management Manual for City of Existing Conditior�s: (See Figure 2) The area of the proposed redevelopment is currently a grassy field sloping from east to west with an approximate siope of 1.7%. The renovated Firestone building and its associated parking borders the site on the East with K-Mart and iYs associated parking bordering the site on the North. To the West is Beverly Lane, a two lane paved residential street. The East shoulder of Beverly Lane, adjacent to the project site, is unimproved. Pmposed Conditions Summary The new parking surface will require detention to be upgraded from the current conditions. The project area is approximately 0.92 acres, with 0.67 acres propoaed impervious surface. The driveable surface area is 0.47 acres. Per the Ciry of Eve!ett manual the existing conditions fr�r the e site will be modeled to the conditions pre-developed. After conversations with City of Everett � Public Works Department Engineers (12/7/02 Jane Zimmerman), existing conditions will be grass with a curve number of 85 per SCS Western Washington Runoff Curve Numbers Table. The � following is a list of flows for the existing conditions: �z.,�a� = 0.08 cfs Q,o-roa, = 0.1 S cfs Q�oo-�„ = 0.34 cfs (refer to hydrographs in Appendix A) For a discussion on the existing downstream conditions review the Downstream Analysis Section of this report. May 2003 1 oFs ABKJ, Inc. �5�