APPROVED BLD2023-0069+Storm_Drainage_Report+1.17.2023_2.45.43_PM+3318754RAM Engineering
RECEIVED
oFeb 08 E0235
DEPARTM
To: City of Edmonds
Engineering Division
From: Rob Long, PE
RAM Engineering
Subject: 23911 9111 PI W, Lot 1 Brackett's Reserve
Stormwater Memo
RAM Job No. 20-024
Memorandum
Date: December 9, 2022
COMPLIES WITH APPLICABLE
CITY STORM CODE
03/06/2023
BLD2023-0069
This memo provides a summary of the stormwater drainage control system for Lot 1 of the Brackett's Reserve
Plat (PLN 2021-0037). 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 the Brackett's Reserve
detention vault located in Track 999 of the plat. The plat design has allocated 2,800 sf of hard surface for Lot 1
hard surface areas.
Below is a stormwater control summary table for Lot 1:
Stormwater Control Summary:
Project Site Category: Category 2 (part of the Brackett's Reserve Plat)
Discharge Location: City's Municipal Separate Storm Sewer System (MS4)
Type of Area
Square Footage
Storm water Facility
Lawn and Landscape
3,126 sf
Soil Amendments (BMP T5.13)
Roof
1,904 sf
Plat Detention Vault
Hard Surfaces
530 sf
Plat Detention Vault
(Driveway/Apron, Walk and Patio)
25% Retrofit
0 SF
None
PKAM Engineering 19109 3611 Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com
23911 91st PI W, Lot 1 Brackett's Reserve
Stormwater Memo
RAM Job No. 20-024
23911 91st PI W, Lot 1 Brackett's Reserve Hard Surface Summary:
Roof = 1,904 sf
Driveway = 400 sf
Sidewalk/Patio = 130 sf
Total = 2,434 sf
Allowed/Allocated = 2,800 sf
UTWn
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Page 2 of 2
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RAM Engineering 19109 3611 Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com