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NKC Everett <br />Everett, Washington Drainage Memorandum <br />1. PROJECT OVERVIEW AND MINIMUM REQUIREMENTS <br />The proposed project consists of 1,997 SF of disturbed area located at 1010 SE Everett Mall. <br />Site improvements are limited to a new pick-up and drop-off area within an existing parking lot <br />connected via a new sidewalk to the entrance of an existing building. Landscaped areas will <br />border the new hardscape to tie the improvements into the existing conditions. The total new <br />plus replaced hard surface area is 1,266 square feet. See Appendix A maps of Pre- and Post - <br />Project Land Cover. <br />Existing grading and drainage patterns will remain unchanged, with new paved areas graded to <br />drain to existing catch basins. No new drainage infrastructure is proposed as a part of this <br />project. <br />Stormwater management will comply with the Washington State Department of Ecology <br />Stormwater Management Manual for Western Washington (SWMMWW) except where modified <br />by the City of Everett Municipal Code and the City of Everett Design and Construction <br />Standards and Specifications. According to Volume 1 Section 2.4 of the SWMMWW, projects <br />with less than 2,000 SF of new plus replaced impervious that disturb less than 7,000 SF of land <br />must comply with Minimum Requirement #2: Construction Stormwater Pollution Prevention. See <br />Section 2 for compliance with Minimum Requirement #2. <br />2. COMPLIANCE WITH MINIMUM REQUIREMENT #2 <br />According to Volume 1 Section 2.5.2 of the SWMMWW, projects which result in less than 2,000 <br />square feet of new plus replaced hard surface area and disturb less than 7,000 square feet of <br />land are not required to prepare a Construction Stormwater Pollution Prevention Plan (SWPPP). <br />However, the project must document compliance with the 13 Elements of Construction <br />Stormwater Pollution Prevention that pertain to the project. Compliance with the 13 Elements is <br />demonstrated in the project's Temporary Erosion and Sediment Control (TESC) and Demoltion <br />Plans, and summarized below. <br />Element 1: Preserve Vegetation/Mark Clearing Limits <br />Existing vegetation will be left undisturbed wherever possible. Protecting the pre -established <br />lawn and tree cover in the vicinity of construction activities will minimize exposed soils and keep <br />the surrounding ground surface stabilized, minimizing the risk of erosion and sediment washout. <br />Element 2: Establish Construction Access <br />The site improvements proposed with -this project are concentrated in a small portion of an <br />existing parking lot. Removal of existing pavements will be limited to the extents necessary to <br />construct the new loading zone, so fully paved access to the project site will remain possible <br />throughout construction. Construction vehicles will not be exposed to bare soils, and will <br />therefore not contribute to erosion or track sediment into the site and surrounding streets. <br />If sediment track -out is encountered during construction, the contractor will sweep streets and <br />surrounding pavements, and employ additional sedimentation BMPs to control, see Element 4 <br />below for more information. <br />KPFF Consulting Engineers December 11, 2019 <br />Page 1 of 8 <br />