APPROVED ENG BLD2023-0510+Storm_Drainage_Report+4.25.2023_7.32.51_AM+3502786RAM Engineering
RECEIVED
Apr 25 2023
CIN OF EDMONDS
DEVELOPMENT
ES
SERVICES
To: City of Edmonds
Engineering Division
From: Rob Long, PE
RAM Engineering
Subject: 23908 91" PI W, Lot 10 Brackett's Reserve
Stormwater Memo
RAM Job No. 20-024
Memorandum
Date: March 31, 2023
COMPLIES WITH APPLICABLE
CITY STORM CODE
BLD2023-0510
03/07/2023
This memo provides a summary of the stormwater drainage control system for Lot 10 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
10 hard surface areas.
Below is a stormwater control summary table for Lot 10:
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
2,445 sf
Soil Amendments (BMP T5.13)
Roof
1,987 sf
Plat Detention Vault
Hard Surfaces
620 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
23908 91st PI W, Lot 10 Brackett's Reserve Page 2 of 2
Stormwater Memo
RAM lob No. 20-024
23908 91st PI W, Lot 10 Brackett's Reserve Hard Surface Summary:
Roof = 1,987 sf
Driveway = 460 sf
Sidewalk/Patio = 160 sf
Total = 2,607 sf
Allowed/Allocated = 2,800 sf
UTILITY
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SOLUTIONS NW ON SHEET GY-01 SI DE WALK/PATI O EASEMENT TO EENETT7" i� 7
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5151/2023
ENGINEERING DIVISION
APPROVED AS NOTED
jd] t#44t* u 06/14/2023
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PKAM Engineering 19109 3611 Ave W, Suite 100 Lynnwood WA 98036 (425)678-6960 RAMengineeringinc.com