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t <br /> Anstey Engineering <br /> 8627 NE 180th Street <br /> Bothell,WA 98011 <br /> Phone:206-303-7639 <br /> Fax:425-486-0267 <br /> E-mail:benanstey@juno.com <br /> September 17,2012 <br /> A&V Home Improvements proposed Duplex <br /> Located at:6027 Glenwood Avenue <br /> Everett,WA 98203 <br /> Targeted Drainage Review <br /> Section 1 Project DescriptionOverview <br /> The 15,961sf(0.366+/-acre) site is located on the Southeast corner of Glenwood Avenue <br /> and Seahurst Avenue. The site is currently vacant. The site slopes down to the northeast <br /> at 10%+/-. Storm water runoff currently sheet flows off of the vacant site t Seahurst <br /> Avenue. See attached basin map. The flow will continue to flow to thee3ge4 as it now <br /> does but an infiltration trench will be installed to better infiltrate the flow from the <br /> driveway. Splashblocks will spread the flow from the roof out over the site. The <br /> pavement will slope to the catch basin and the catch basin will drain to the infiltration <br /> trench. An overflow will be provided to the Drain at the NE Corner of the lot. <br /> The site is located on Parcel 0043680000550. The site address is:6027 Glenwood Avenue <br /> Everett,WA 98203 <br /> This re-development project will pave 2,980sf of existing grass. The project proposes to <br /> construct a 1,740sf Duplex and a 1,240sf driveway. See site plan. <br /> Section 2 Site Assessment <br /> Per the City of Everett Storm Drainage Manual Figure 2.1, Requirements 1 through 5 will <br /> be met. <br /> Requirement#1—A storm water site plan will be provided-see attached. <br /> Requirement#2—A Site Pollution Prevention Plan will be provided-see attached <br /> Requirement#3— Source control of pollutants will be provided by a downturned elbow in the driveway <br /> catch basin and the infiltration trench for the driveway runoff. <br /> Requirement#4— Preserve the Natural Drainage will be complied with as the runoff will continue to flow. <br /> as it does now to the north,south,and east <br /> Requirement#5—Infiltrate,Retain or Disperse stormwater runoff to the extent feasible. Splashblocks for <br /> the roof downspouts will provide the maximum dispersion for roof runoff. A catch basin and <br /> infiltration/dispersion trench will provide the maximum infiltration,Retention and Dispersion available <br /> for stormwater runoff from the driveway on this site. <br /> The soils on the site are Alderwood series (6)per the SCS Soil Map so the use of total <br /> infiltration for the disposal of storm runoff is not reliable. <br /> Erosion Control can be provided by a construction entrance and silt fence around the <br /> north south and east sides of the property. <br /> 1 <br />