APPROVED STM_BLD2023-0253+Storm_Drainage_Report+2.27.2023_3.38.28_PM+3391094RAM Engineering
RECEIVED
Mar O7 2023
To: City of Edmonds
Engineering Division
From: Rob Long, PE
RAM Engineering
Subject: 23906 9111 PI W, Lot 9 Brackett"s Reserve
Stormwater Memo
RAM Job No. 20-024
Memorandum
Date: February 14, 2023
COMPLIES WITH APPLICABLE
CITY STORM CODE
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BLD2023-0253
This memo provides a summary of the stormwater drainage control system for Lot 9 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 9
hard surface areas.
Below is a stormwater control summary table for Lot 9:
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
2,204 sf
Soil Amendments (BMP T5.13)
Roof
2,246 sf
Plat Detention Vault
Hard Surfaces
550 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
23906 91st PI W, Lot 9 Brackett's Reserve
Stormwater Memo
RAM lob No. 20-024
Page 2 of 2
23906 91st PI W, Lot 9 Brackett's Reserve Hard Surface Summary:
Roof = 2,246 sf
Driveway = 400 sf
Sidewalk/Patio = 150 sf
Total = 2,796 sf
Allowed/Allocated = 2,800 sf
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RAM Engineering 191093611Ave W, Suite 100 Lynnwood WA 98036 (425) 678-6960 RAMengineeringinc.com