2210 37TH ST 2018-01-02 MF Import

This Report was produced in accordance with the 2010 City of Everett Stormwater Management Manual (Drainage Manual). According to Volume I of the drainage manual, the proposed improvements will be required to meet Minimum Requirements #1 through #5, since more than 2,000 square feet of new impervious surfaces will be added. A summary of how each of the minimum requirements is met is as follows. Minimum Requirement #1: Preparation of Stormwater Site Plans: This Report along with the Construction Plans satisfies this minimum requirement. Minimum Requirement #2: Construction Stormwater Pollution Prevention: See Section 2 of this Report for the SWPPP BMP Elements. Minimum Requirement #3: Source Control of Pollution: Permanent source control BMPs are not applicable for the subject site since the associated activities for the new residence do not fall within the types of facilities listed within Chapter 2, Volume IV of the Drainage Manual. BMPs for erosion and sedimentation control are specified in the Construction Plans and the SWPPP. Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls: The natural location of discharge and drainage path will remain unchanged when improvements have been completed. See Offsite Analysis in Section 3 of this Report. Minimum Requirement #5: Onsite Stormwater Management: Per Chapter 12, Volume III of the Drainage Manual, the Onsite Stormwater Management BMPs do not apply if they are within 10 feet of any existing structure or property line. Due to the existing site layout and constraints, there is insufficient space to implement the dispersion or infiltration based BMPs. Additionally, existing soil has an insufficient infiltration rate, so the Onsite Stormwater Management BMPs are infeasible on this site. Soil Amendments, October 2013 1-2 LDC Job No. 13-118