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11235 SE 6TH STREET r 425.453.9501 <br /> SUITE 220 F 425.453.8208 V S i,L a�t el:' ► <br /> BELLEVUE,WA 98004 WWW.PACIAND.COM <br /> Memorandum <br /> Date: July 7, 2008 <br /> To: Jane Zimmerman, City of Everett Public Works <br /> 3200 Cedar Street Z (4 <br /> Everett, WA 98201 <br /> From: Steven Pesce lC'J <br /> � <br /> Subject: Stormwater Pond Sizing <br /> Lots 3C and D — Seaway Center <br /> This memo serves as written agreement with the City to formally allow the stormwater pond on <br /> lot 3D to be constructed large enough, at this time, to serve the approved development on lot 3C <br /> and future proposed development on lot 3D. <br /> As long as future development meets the design assumptions for the pond with respect to the total <br /> amount of area draining to the pond and the percent impervious of that area, it is agreed that <br /> enlargement of the pond to provide additional detention or retention storage volumes will not be <br /> required by the City for further development of lot 3D. However, modifications to the pond's <br /> flow control structure may be required when future development occurs. <br /> The pond is located north of Lot 3C on Lot 3D, which is owned by the Northshore Christian <br /> Church. This pond collects stormwater from the Narbeck Creek Basin, which consists of basin <br /> areas on Lot 3C as well as Lot 3D. <br /> Details for the contributing basins on each lot are as follows: <br /> Lot 3C Lot 3D _. <br /> Drainage Area _ 3.33 acres 4.21 acres <br /> Pervious CN 86 86 <br /> Impervious CN 98 _ 98 <br /> Soil Type <br /> Pervious Area 0.77 acres Min. 0.42 acres <br /> Percent Impervious 77% Max. 90% <br /> Impervious Area 2.56 acres Max. 3,79 acres <br />