1606 SE EVERETT MALL WAY ANTHEM SELF STORAGE 2025-07-25

STORMWATER POLLUTION PREVENTION PLAN (SWPPP) SUPPLEMENTAL NARRATIVE ' This entire Drainage Report together with the full construction plan set for the Anthem Self- Storage Facility, constitute a Stormwater Pollution Prevention Plan per the guidelines of C.O.E. II-2.1 (2010 edition). D.O.E. regards them as inseparable components of the same plan, and ' requires that the entire plan be on site or easily accessible to the site during construction. To enable ease of use and to promote compliance, all of the required information of substance is integrated into the accompanying construction plan. Most of the required background narrative is incorporated in this Drainage Report. This supplemental narrative provides required information not presented elsewhere in this report and fulfills the applicable documentation and paperwork requirements. ' It is the responsibility of the owner or lessee of the land being developed to prepare and submit the Construction SWPPP to local authorities. In addition the operator of the construction site must apply for permit coverage and is responsible for applying and following the terms of the Construction Stormwater General Permit. Because the proposed area of disturbance exceeds one acre, this project requires a Stormwater General Permit under the National Pollutant Discharge ' Elimination System(NPDES). The completion of a Notice of Intent (NOI)Application should be submitted to Washington Department of Ecology(D.O.E.) at least sixty days prior to discharging stormwater from the project site. Twelve Elements of Construction Stormwater Pollution Prevention: 1. Mark clearing limits: Clearing limits and marking requirements are shown on the grading ' and T.E.S.C. plan, Sheet C2.0 of the construction plans. The clearing limits encompass the entire site and the sidewalk, curb and gutter on Everett Mall Way as well as the portion of WSDOT right-of-way for the storm outfall discharge pipe. ' 2. Establish construction access: An armored construction access is shown on the grading and T.E.S.C. plan, Sheet C2.0 and City of Everett detail, Sheet C2.2 of the construction plans. Street sweeping is addressed in T.E.S.C. General Note#12, Sheet C2.1. Wheel washes are ' not required by the basic T.E.S.C. plan for dry-season work, but if winter grading occurs wheel washes are an option that may become mandatory if shown to be necessary during the wet season. 3. Control flow rates: A detention facility is proposed to collect stormwater runoff from impervious surfaces and release the runoff through a control structure per rates regulated by the City of Everett and passing the WWHM2012 calculations. One of the first steps in ' grading the site will be to construct the water quality, detention and outflow system and use it to collect any storm runoff that may occur during the rest of the construction process. 4. Install sediment controls: Silt fences, straw wattles, an armored construction entrance, catch ' basin inlet protection and mulching are specified for sediment control. Locations and details are provided in the construction grading and T.E.S.C. plans Sheets C2.0, C2.1, C2.2. 5. Stabilize soils: The notes on Sheet C2.0, T.E.S.C. notes on Sheet C2.1 of the construction ' plans and the details on Sheet C2.2 provide specifications to meet D.O.E. stabilization requirements for disturbed areas and stockpiles. f 1