APPROVED_BLD2023-0254+Storm_Drainage_Report+3.15.2023_11.19.08_AM+3422587RAM Engineering
RECEIVED
vM of p5 2023
To: City of Edmonds
Engineering Division
From: Rob Long, PE
RAM Engineering
Subject: 23910 9151 PI W, Lot 11 Brackett's Reserve
Stormwater Memo
RAM Job No. 20-024
Memorandum
Date: February 14, 2023
Update: March 15, 2023
COMPLIES WITH APPLICABLE
CITY STORM CODE
Y � Sti,,�sr�, P. �.
03/15/2023
BLD2023-0254
This memo provides a summary of the stormwater drainage control system for Lot 11 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 11
hard surface areas.
Below is a stormwater control summary table for Lot 11:
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
Stormwater Facility
Lawn and Landscape
2,216 sf
Soil Amendments (BMP T5.13)
Roof
2,194 sf
Plat Detention Vault
Hard Surfaces
590 sf
Plat Detention Vault
(Driveway/Apron, Walk and Patio)
25% Retrofit
0 SF
None
RAM Engineering 19109 36" Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com
23910 91st PI W, Lot 11 Brackett's Reserve
Stormwater Memo
RAM lob No. 20-024
23910 91st PI W, Lot 1 Brackett's Reserve Hard Surface Summary:
Roof = 2,194 sf
Driveway = 430 sf
Sidewalk/Patio = 160 sf
Total = 2,784 sf
Allowed/Allocated = 2,800 sf
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RAM Engineering 19109 36" Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com