APPROVED STM BLD2023-1244+Storm_Drainage_Report+10.5.2023_12.56.10_PM+3824058COMPLIES WITH APPLICABLE
CITY STORMWATER CODE
RECEIVED
RAM Engineering BLD2023-1244 Oct 11 2023 03/13/2024
CITY OFEMemorandum
DEVELOPMENTTSERVICES
DEPARTMENT
To: City of Edmonds Date: September 28, 2023
Engineering Division
From: Rob Long, PE
RAM Engineering
Subject: Select Homes Lot 3 of 22214 98th Ave W Short Plat
Stormwater Memo
RAM Job No. 21-011
This memo provides a summary of the stormwater drainage control system for Lot 3 of the 981h St SW. Short
Plat (PLN 2022-0088). A site -specific geotechnical evaluation recommends one stormwater BMP for the site;
BMP T5.13: Post -Construction Soil Quality and Depth based on the site's soil conditions. In accordance with
Edmonds Code, lawn and landscape areas will be managed by post -construction soil quality and depth (soil
amendments). The roof top, driveway, walk and patio areas will be managed by a jointly owned R-tank
detention system to be installed with the short plat site improvements. The short plat R-tank detention has
allocated 3,360 sf of hard surface for Lot 3.
Below is a stormwater control summary table for Lot 3:
Stormwater Control Summary:
Project Site Category: Category 2 (part of the 98th Ave W 3-Lot Short Plat)
Discharge Location: City's Municipal Separate Storm Sewer System (MS4)
Type of Area
Square Footage
Storm water Facility
Lawn and Landscape
5,987 sf
Soil Amendments (BMP T5.13)
Roof
2,510 sf
Short Plat R-tank Detention System
Hard Surfaces
850 sf
Short Plat R-tank Detention System
(Driveway/Apron, Walk and Patio)
25% Retrofit
0 SF
None
RAM Engineering 19109 361h Ave W, Suite 100 Lynnwood WA 98036 (425) 678-6960 RAMengineeringinc.com
Select Homes - Lot 3 of 22214 981h Ave Short Plat Page 2 of 2
Stormwater Memo
RAM Job No. 21-011
Select Homes 98t" Ave W Short Plat Lot 3 Hard Surface Summary:
Roof = 2,510 sf
Driveway = 800 sf
Sidewalk/Patio = 50 sf
Total = 3,360 sf
10 I
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9 VOL. 17, PGS, 56-7 UM02DEA looro2zm
00602100100" 2.510 SF INSTALL 1-1/2- PE (160 PSI) 1 1
ROOF FROM WATER 57US To HOUSE I
(TRACER WRE TO BE INSTALLED L 10
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-- -- -_ - WALK/PATIO
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8 ROOF DRAIN
EcauM DAnaNs) M e COVERED I O 1.OX MIN ALL ROOKERIES ARE To BE
CONSTRUCTED AS PART OF
98TH AVE W SHORT PLAT
C0NSTRUC80N (PLNT02T-ooBB)
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DRAINAGE U7W1Y
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/ L _ SHORT PLAT IMPROMWENTs
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RAM Engineering 19109 3611 Ave W, Suite 100 Lynnwood WA 98036 (425) 678-6960 RAMengineeringinc.com