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Deccio Engineering Inc. <br /> 17217 7Th Ave.W. <br /> Bothell,WA.98012 <br /> (206)390-8374 <br /> Fax:425-741-8214 <br /> October 9, 2017 <br /> Ms Dana Hendry <br /> Dynasty Homes <br /> P.O. Box 716 <br /> Everett, WA 98206 <br /> Re: Proposed drainage design for 7030 Lower Ridge Road Everett <br /> Dear Dana <br /> This site is 64,126 sf in size,which is under 5-acres and inside the UGA area. The total <br /> impervious area is under 10,000 sf and total PGHS is under 5,000 sf. Therefore,the site is <br /> exempt for both detention and water quality and requires the use of LID measures. The on-site <br /> soils are determined to be a Type C and not suitable for infiltration. Based on these conditions, <br /> per the DOE 2014 Stormwater Management Manual, Volume 1, Chapter 2, Table 2.5.1 the <br /> project has the option of using List 2, and BMP T5.13 to address stormwater runoff. <br /> Please note that the on-site contours show the site is separated into two separate sub-basins <br /> which do not combine within 1/4 mile downstream and will be treated as two separate drainage <br /> areas with impervious areas under 5,000 sf each. <br /> These drainage basins and proposed BMP's are as follows: <br /> • The house foot print is located in the west sub-basin which drains west then north and <br /> proposes to use splash blocks along with 50-foot flow paths to address roof runoff along <br /> with BMP T5.13. <br /> • The driveways flow to the eastern sub-basin and out into the street which flows east <br /> then north. The project proposes to use driveway dispersal along with BMP T5.13 to <br /> address the runoff. <br /> Please review and contact me at 206-390-8374 if you have any questions. <br /> Sincerely, <br /> Richard Deccio P.E. <br /> Deccio Engineering <br />