8407 BROADWAY STADIUM STORAGE 2017-06-20

Technical Information Report July 2015 Everett Public Storage 3.0 Minimum Requirements The project must comply with the City of Everett's 2010 Surface Water Management Manual, which adopts the Washington State Department of Ecology's 2005 Stormwater Management Manual for Western Washington. The following analysis complies with these requirements. • Definition of "Redevelopment": "On a site that is already substantially developed (i.e., has 35% or more of existing impervious surface coverage), the creation or addition of impervious surfaces; the expansion of a building footprint or addition or replacement of a structure; structural development including construction, installation or expansion of a building or other structure; replacement of impervious surface that is not part of a routine maintenance activity; and land disturbing activities." — Page G-30 Glossary and Notations of the City of Everett Stormwater Management Manual, dated February 15, 2010. • Flow Chart for Determining Requirements for Redevelopment (Figure 2.1 on Page 2-4 in Volume I — Minimum Technical Requirements). Based on discussion at the pre-application meeting, the City required to treat the site as forested condition and will be required to provide complete stormwater water quality treatment and detention. The Flow chart indicates that Minimum Requirements #1 through #9 apply to the new and replaced impervious surfaces. o Minimum Requirement #1: Preparation of Stormwater Site Plans A description of the proposed stormwater plan is described in Section 1.0 and in Section 4.0 of this report. o Minimum Requirement #2: Construction Stormwater Pollution Prevention A detailed SWPP plan is included in Section 5.0 of this report. o Minimum Requirement #3: Source Control of Pollution No additional source control BMPs are required for this project beyond the BMPs proposed as part of the SWPP Plan (Section 5.0). o Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls The project does not propose to alter existing drainage systems or outfalls. Existing drainage patterns will be maintained as described in Section 2.0 of this report. The project will comply with this requirement as runoff from the new building and replaced impervious surfaces will be detained and connected to the existing drainage system. 14114 Everett Storage TIR Revised 0715.doc 9 Amm