APVD STM BLD2024-1042+Storm_Drainage_Report+8.9.2024_11.31.04_AM+4431929RECEIVED
RAM Engineering
Aug 16 2024
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Memorandum
To: City of Edmonds Date: July 11, 2024
Engineering Division BLD2024-1042
From: Rob Long, PE
RAM Engineering
Subject: Select Homes Lot 2- 22214 98th Ave W of 98t" Ave W Short Plat
Stormwater Memo
RAM Job No. 21-011
This memo provides a summary of the stormwater drainage control system for Lot 2 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 3,230 sf of hard surface for Lot 2.
Below is a stormwater control summary table for Lot 2:
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
Stormwater Facility
Lawn and Landscape
7,473 sf
Disturbed Area
Soil Amendments (BMP T5.13)
Roof
2,430 sf
Short Plat R-tank Detention System
Hard Surfaces
800 sf
Short Plat R-tank Detention System
(Driveway/Apron, Walk and Patio)
25% Retrofit
0 sf
None
COMPLIES WITH APPLICABLE
CITY STORMWATER CODE
08/22/2024
"M Engineering 19109 36th Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com
Select Homes — Lot 2 22214 981h Ave W
Stormwater Memo
RAM Job No. 21-011
Page 2 of 2
Select Homes 98t" Ave W Short Plat Lot 2 Hard Surface Summary:
Roof = 2,430 sf
Driveway = 650 sf
Sidewalk/Patio = 150 sf
Total = 3,230 sf
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