APPROVED_BLD2023-0072+Storm_Drainage_Report+1.17.2023_3.11.04_PM+3318912RAM Engineering
To: City of Edmonds
RECEIVED
Engineering Division
Feb 08 2023
From: Rob Long, PE
CITY OFEDMONDS
RAM Engineering
DEVELOPMENT SERVICES
DEPARTMENT
Subject: 23904 9111 PI W, Lot 8
Brackett-s Reserve
Stormwater Memo
RAM Job No. 20-024
Memorandum
Date: December 9, 2022
BLD2023-0072
COMPLIES = APPLICABLE
CODE
03I01I2023
This memo provides a summary of the stormwater drainage control system for Lot 8 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 8
hard surface areas.
Below is a stormwater control summary table for Lot 8:
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
2,230 sf
Soil Amendments (BMP T5.13)
Roof
1,877 sf
Plat Detention Vault
Hard Surfaces
565 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
23904 91st PI W, Lot 8 Brackett's Reserve
Stormwater Memo
RAM lob No. 20-024
23904 91st PI W, Lot 8 Brackett's Reserve Hard Surface Summary:
Roof = 1,877 sf
Driveway = 405 sf
Sidewalk/Patio = 160 sf
Total = 2,442 sf
Allowed/Allocated = 2,800 sf
l`
/ALL ROCKERIES ARE 7n BE 160 SF 10• JOINT UMITY
C0NS7RUC7ED AS PART AOF
T
BROC RESERI£PLAT SIDEWALK/PATIO EASEMENT
CONSTRUCTION (PLN2021-0037)
CLWSTRUCT ST TEMPORARY
CONSTRUCTION EN CF PER CITY
OF EDMONDS STD D NO ER-901
(SEE DETAIL ON SNT -01) 4555.7.1
l DRY T7UTTES - FG
AREA
I I
GARAGE
I I
FF 456.62
I
1,877 SF
it
ROOF
CONC
PA 770 Ii
8
4' PVC SIDE SEWER -,
O 20T MIN SLOPE
- 4,600 SF
CONNECT TO SS STUB
PROPOSED HOUSE
JJ
LOWER FF 456.87
4' PW FOORNG -
DRAIN 77GH17JNE
32•
O 1.OA MIN
4- PPC ROOF DRAIN -
I�
770HTUNE O 1.OX MIN.
CONNECT TO SO STUB
OSSL
II
SOW
IE 4510t
L _ - -T-7f
`ALL CONCRETE BLOC( WALLS ARE
TO BE CONSTRUCTED AS PART OF
BRACXFTrS R£SER4£ PLAT
CONSTRUC7ION (PLN2021-0037)
INSTALL FOUNDA77ON11FOO77NG DRAIN
ALONG BUILDING PERIMETER F007INGS
PER FOODNO DRAIN DETAIL BY EARTH
SOLU17ONIS NW ON SHEET GN-01
i DMWWAY "
I 405 SF 8
DM g
V I a2X- 1 —
I 20•
I _
Issue
y£ TSzot 1
--Z j 1
C
FILTER FABRIC FENCE PER
CITY OF EDMONDS STD
DWC NO. ER-900
(sir DETAIL ON SHT cm-oo
INSTALL 1-1/2• PE (160 PSI) SEROCE
LINE FROM WATER METER TO HOUSE
7RACER WIRE TO BE INSTALLED
WI7H WATER UNE.
(I- WATER SERWCE R METER TO BE
INSTALLED AS PART OF BRACKET'S
RESERI£ PLAT.)
12/9/2022
Page 2 of 2
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RAM Engineering 19109 36"Ave W, Suite 100 Lynnwood WA 98036 (425) 678-6960 RAMengineeringinc.com