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Cooley Smiles Dental Clinic 17318.20 October 18,2017 <br /> Drainage Report Section V,Page 1 <br /> Section V — Construction Stormwater Pollution Prevention <br /> Section V Summary <br /> Narrative <br /> The proposed project is a new 4,787 sf dental clinic building with parking and landscaping. It will be <br /> located on 2 existing parcels at 10627 and 10709 19th Ave SE in Everett, WA. Land disturbance will affect <br /> the extents of both parcels. Frontage improvements are required for 106th PI SE to the north, and <br /> restoration of curb, gutter, and sidewalk are required for abandoned driveways along 19th Ave SE to the <br /> west. <br /> Erosion control details are provided consistent with the City of Everett standards. Erosion control plan <br /> sheets are provided in full size as a part of the civil drawing set. <br /> A Construction SWPPP is not required by the Department of Ecology because the site is under one acre <br /> (the land-disturbing activity threshold which requires the completion of their SWPPP document and <br /> Construction Stormwater General Permit). <br /> The elements for construction pollution prevention are discussed as follows: <br /> Element 1: Mark Clearing Limits <br /> To protect adjacent properties and to reduce the area of soil exposed to construction,the limits of <br /> construction will be clearly marked before land-disturbing activities begin. Clearing limits will be to the <br /> extents of necessary land disturbance.The BMPs relevant to marking the clearing limits that will be <br /> applied for this project include: <br /> High Visibility Plastic or Metal Fence (BMP C103) <br /> Element 2: Establish Construction Access <br /> Construction access or activities occurring on unpaved areas shall be minimized,yet where necessary, <br /> access points shall be stabilized to minimize the tracking of sediment onto public roads.The existing <br /> entrance to the site may be used as a stabilized construction entrance and moved to the proposed <br /> driveway location when necessary. <br /> Stabilized Construction Entrance (BMP C105) <br /> Element 3:Control Flow Rates <br /> The site has a flat slope (1%) and is small enough (less than an acre)that a silt fence used for Element 4 <br /> may be used to control flow rates. <br /> Element 4: Install Sediment Controls <br /> 250 4th Avenue South,Suite 200 <br /> Edmonds,WA 98020 <br /> ENGINEERING ph.425378.8500 I f.425.778.5536 <br /> www.cgengineering.com <br />