3800 RIVERFRONT BLVD 2021-01-28 - Laserfiche WebLink

I Stormwater Pollution Prevention Plan 1.0 Introduction This Stormwater Pollution Prevention Plan(SWPPP)has been prepared as part of the NPDES stormwater permit requirements for the Everett Riverfront— Simpson Site, Phase 3 Preload Removal project in Everett, Washington. The site is situated adjacent to the west side of the Snohomish River, south of Pacific Avenue, east of I-5, and north of Rotary Park and Lowell Snohomish River Road. The existing site is cleared and vacant land, with little to no vegetation, and is currently filled with preload materials at depths of approximately 10',under a separate permit. The proposed 10.6 acre site will ultimately include single family homes, including public streets, sidewalks, landscape, underground utilities including water, sewer, and storm drain infrastructure, as well as dedicated open space for park areas.. The proposed design incorporates dispersion trench/bio-swale facilities that have been sized to meet flow control and water quality requirements. Construction activities under this permit will include excavation and removal of the preload materials and rough grading of the site. Construction of the streets, utilities, and homes will be under a separate permit. The purpose of this SWPPP is to describe the proposed construction activities and all temporary and permanent erosion and sediment control (TESC)measures, pollution prevention measures, inspection/monitoring activities, and recordkeeping that will be implemented during the proposed construction project. The objectives of the SWPPP are to: 1. Implement Best Management Practices (BMPs)to prevent erosion and sedimentation, and to identify, reduce, eliminate or prevent stormwater contamination and water pollution from construction activity. 2. Prevent violations of surface water quality, ground water quality, or sediment management standards. 3. Prevent, during the construction phase, adverse water quality impacts including impacts on beneficial uses of the receiving water by controlling peak flow rates and volumes of stormwater runoff at the Permittee's outfalls and downstream of the outfalls. This SWPPP was prepared using the Ecology SWPPP Template downloaded from the Ecology website on October 28, 2013. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater Management Manual for Western Washington (SWMMWW 2005). The report is divided into seven main sections with several appendices that include stormwater related reference materials. The topics presented in each of 111 the main sections are: • Section 1 —INTRODUCTION. This section provides a summary description of the project, and the organization of the SWPPP document. • Section 2— SITE DESCRIPTION. This section provides a detailed description of the existing site conditions, proposed construction activities, and calculated stormwater flow rates for existing conditions and post-construction conditions. 1 1 1